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Cooperative Multihop Communication for Underwater Acoustic Networks
E-Print Network [OSTI]
Cooperative Multihop Communication for Underwater Acoustic Networks Cecilia Carbonelli and Urbashi propagation 1. INTRODUCTION Underwater sensor networks will find applications in data collection, pollution acoustic (UWA) channels differ from those in other media, such as radio channels, due to the high temporal
Zhou, Shengli
Piezoelectric materials used in underwater acoustic transducers
SciTech Connect (OSTI)
Piezoelectric materials have been used in underwater acoustic transducers for nearly a century. In this paper, we reviewed four different types of piezoelectric materials: piezoelectric ceramics, single crystals, composites, and polymers, which are widely used in underwater acoustic transducers nowadays. Piezoelectric ceramics are the most dominant material type and are used as a single-phase material or one of the end members in composites. Piezoelectric single crystals offer outstanding electromechanical response but are limited by their manufacturing cost. Piezoelectric polymers provide excellent acoustic impedance matching and transducer fabrication flexibility although their piezoelectric properties are not as good as ceramics and single crystals. Composites combined the merits of ceramics and polymers and are receiving increased attention. The typical structure and electromechanical properties of each type of materials are introduced and discussed with respect to underwater acoustic transducer applications. Their advantages and disadvantages are summarized. Some of the critical design considerations when developing underwater acoustic transducers with these materials are also touched upon.
Li, Huidong; Deng, Zhiqun; Carlson, Thomas J.
Scientific Solutions (TRL 5 6 Component) - Underwater Active...
Broader source: Energy.gov (indexed) [DOE]
Energy Scientific Solutions (TRL 5 6 Component) - Underwater Active Acoustic Monitoring Network for Marine and Hydrokinetic Energy 40aamssistein.ppt More Documents &...
Distributed Space-Time Cooperative Schemes for Underwater Acoustic Communications
Distributed Space-Time Cooperative Schemes for Underwater Acoustic Communications Madhavan, which is a main characteristic of underwater acoustic channels. A time-reversal distributed space in oceanic research, such as [3] [4]: data collec- tion, pollution monitoring, tactical surveillance
Stojanovic, Milica
Challenges for Efficient Communication in Underwater Acoustic Sensor Networks
Challenges for Efficient Communication in Underwater Acoustic Sensor Networks Ian F. Akyildiz for oceano- graphic data collection, pollution monitoring, offshore explo- ration and tactical surveillance in collaborative monitoring missions. Underwater acoustic network- ing is the enabling technology
Pompili, Dario
Wormhole-Resilient Secure Neighbor Discovery in Underwater Acoustic Networks
), Unmanned Underwater Vehicles (UUV), and surface stations, and nearby nodes communicate via acoustic ratherWormhole-Resilient Secure Neighbor Discovery in Underwater Acoustic Networks Rui Zhang and Yanchao in underwater acoustic networks (UANs) with floating node mobility. In hostile environments, neighbor discovery
Zhang, Rui
Autonomous Data Collection from Underwater Sensor Networks using Acoustic Communication
for an autonomous underwater vehicle (AUV) to collect data from an underwater sensor network. The sensors. A potential solution is the use of a mobile autonomous under- water vehicle (AUV) equipped with an acousticAutonomous Data Collection from Underwater Sensor Networks using Acoustic Communication Geoffrey A
Sukhatme, Gaurav S.
Exploiting the BandwidthDistance Relationship in Underwater Acoustic Networks
(UWASNs) may also be augmented with autonomous underwater vehicles (AUVs); for example, this unmanned1 Exploiting the Bandwidth�Distance Relationship in Underwater Acoustic Networks Paolo Casari consumption, and transmission delay in a Underwater Wireless Acoustic Sensor Network (UWASN). We compare
Localization with Dive'N'Rise (DNR) Beacons for Underwater Acoustic Sensor Networks
Localization with Dive'N'Rise (DNR) Beacons for Underwater Acoustic Sensor Networks Melike Erol-Based Systems]: Underwater acoustic sensor networks - localization General Terms: Performance Keywords: Underwater sensor networks, localization, positioning, mobile beacon 1. INTRODUCTION Pollution monitoring
Tones for Real: Managing Multipath in Underwater Acoustic Wakeup
, but acoustic prop- agation is five orders-of-magnitude slower than RF, so propagation times stretch to hundreds. Their success has sparked interest in bringing these characteristics underwater to improve our ability to chart
Heidemann, John
Three-Dimensional Routing in Underwater Acoustic Sensor Networks
Three-Dimensional Routing in Underwater Acoustic Sensor Networks Dario Pompili and Tommaso Melodia applications in oceanographic data collection, pollution monitoring, offshore exploration, disaster prevention in a 3D underwa- ter acoustic sensor network is investigated at the network layer, by considering
An Advanced Channel Framework for Improved Underwater Acoustic Network Simulations
such as pollution, climate change and severe weather events is rapidly increasing. At the same time, as ocean underwater sensors, vehicles and devices together using acoustic communication. Network protocol development operation. However, acoustic communication performance is dynamic and dependent upon the environment
Underwater acoustic sensor networks: research challenges Ian F. Akyildiz *, Dario Pompili, Tommaso Melodia
Underwater acoustic sensor networks: research challenges Ian F. Akyildiz *, Dario Pompili, Tommaso will find applications in oceanographic data collection, pollution monitoring, offshore exploration acoustic networking is the enabling technology for these applications. Underwater networks consist
Three-dimensional and two-dimensional deployment analysis for underwater acoustic sensor networks q
Three-dimensional and two-dimensional deployment analysis for underwater acoustic sensor networks q Accepted 23 July 2008 Available online 7 August 2008 Keywords: Underwater acoustic sensor networks data collection, pollution monitoring, offshore exploration, disaster prevention, assisted navigation
An Architecture for Ocean Bottom UnderWater Acoustic Sensor Networks (UWASN)
An Architecture for Ocean Bottom UnderWater Acoustic Sensor Networks (UWASN) Dario Pompili, Tommaso collection, pollution monitoring, offshore exploration, and tactical surveillance applications. To make Acoustic Networking (UWASN) is the en- abling technology for these applications [1]. Underwater Networks
Melodia, Tommaso
Turbo Detection for Mobile MIMO Underwater Acoustic Communications
Turbo Detection for Mobile MIMO Underwater Acoustic Communications Jun Tao , Yahong Rosa Zheng-- Turbo detection for high data-rate single-carrier mobile multiple-input, multiple-output (MIMO signal is then sent to a MIMO turbo equalization module for detection. In the MIMO turbo equalization
Zheng, Yahong Rosa
An Aquatic Acoustic Metrics Interface Utility for Underwater Sound Monitoring and Analysis
Fishes and other marine mammals suffer a range of potential effects from intense sound sources generated by anthropogenic underwater processes such as pile driving, shipping, sonars, and underwater blasting. Several underwater sound recording devices (USR) were built to monitor the acoustic sound pressure waves generated by those anthropogenic underwater activities, so the relevant processing software becomes indispensable for analyzing the audio files recorded by these USRs. However, existing software packages did not meet performance and flexibility requirements. In this paper, we provide a detailed description of a new software package, named Aquatic Acoustic Metrics Interface (AAMI), which is a Graphical User Interface (GUI) designed for underwater sound monitoring and analysis. In addition to the general functions, such as loading and editing audio files recorded by USRs, the software can compute a series of acoustic metrics in physical units, monitor the sound's influence on fish hearing according to audiograms from different species of fishes and marine mammals, and batch process the sound files. The detailed applications of the software AAMI will be discussed along with several test case scenarios to illustrate its functionality.
Ren, Huiying; Halvorsen, Michele B.; Deng, Zhiqun; Carlson, Thomas J.
State-of-the-Art in Protocol Research for Underwater Acoustic Sensor Networks
to observe and predict the ocean. Unmanned or Autonomous Underwater Vehi- cles (UUVs, AUVs), equipped (UW-ASNs) will consist of sensors and vehicles deployed underwater and networked via acoustic linksState-of-the-Art in Protocol Research for Underwater Acoustic Sensor Networks Ian F. Akyildiz
For the Wiley Encyclopedia of Electrical and Electronics Engineering Underwater Acoustic Communication
For the Wiley Encyclopedia of Electrical and Electronics Engineering Underwater Acoustic, MA 02115 Keywords: acoustic communications coherent equalization channel estimation multi- path communications exists in applications such as remote control in o -shore oil industry, pollution monitoring
The ICoN integrated communication and navigation protocol for underwater acoustic networks
The deployment of autonomous underwater devices has increased dramatically in the last several years, presenting a strong and growing need for a network protocol to mediate acoustic communications between devices. This ...
Kanthan, Rupesh R
Harvesting time-frequency-space diversity with coded modulation for underwater acoustic communications
The goal of this thesis is to design a low-complexity, high data-rate acoustic communications system with robust performance under various channel conditions. The need for robust performance emerges because underwater ...
Pelekanakis, Konstantinos
Evaluation of an acoustic detection algorithm for reactive collision avoidance in underwater applications
This thesis sought to evaluate a vehicle detection algorithm based on a passive acoustic sensor, intended for autonomous collision avoidance in Unmanned Underwater Vehicles. By placing a hydrophone at a safe distance from ...
Viquez Rojas, Oscar Alberto
Sensitivity of an underwater acoustic array to ultra-high energy neutrinos
the maximum energy of protons of cos- mological origin somewhere below 1020 eV, be- cause of the finite (%50Sensitivity of an underwater acoustic array to ultra-high energy neutrinos Nikolai G. Lehtinen the possibility of searching for ultra high energy neutrinos in cosmic rays using acoustic techniques in ocean
Buckingham, Michael
Tier-Based Underwater Acoustic Routing for Applications with Reliability and Delay Constraints
Tier-Based Underwater Acoustic Routing for Applications with Reliability and Delay Constraints Li of New York at Buffalo Buffalo, New York 14260 Email: email@example.com Abstract--UnderWater Acoustic and military applications such as oceanographic data collection, pollution monitoring, offshore exploration
Proceedings of the International Conference "Underwater Acoustic Measurements: Technologies & Results" Heraklion, Crete, Greece, 28th
with entrainments of bubbles of calculated sizes [6] (later augmented by use of the Gabor transform when entrainmentProceedings of the International Conference "Underwater Acoustic Measurements: Technologies the acoustic information was available in order to interpret conditions on Titan. The exercise includes
Sóbester, András
E-Print Network 3.0 - acoustic detection activities Sample Search...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
include underwater acoustics... acoustics, acoustic detection and classification of subsea objects and machine reliability. During his visit... unexploded ordnance ... Source:...
propagation is five orders-of- magnitude slower than RF, so propagation times stretch to hundreds sparked interest, bring- ing sensing with these characteristics underwater to improve our ability to chart
Joint Time and Spatial Reuse Handshake Protocol for Underwater Acoustic
, ocean exploration, undersea navigation and control over autonomous underwater vehicles, to name just and the high cost of retransmissions due to the long transmission delay and large energy consumption
Lampe, Lutz
Dusky Dolphin (Lagenorhynchus obscurus) Underwater Bait-Balling Behaviors and Acoustic Signals: A Comparison Between Argentina and New Zealand
I characterized dusky dolphin (Lagenorhynchus obscurus) underwater bait-balling behaviors and acoustic signals, and compared data between Argentina and New Zealand (NZ) to investigate the roles of ecology versus social learning. I quantified prey...
Vaughn, Robin
Design Parameters of a Miniaturized Piezoelectric Underwater Acoustic Transmitter
The Juvenile Salmon Acoustic Telemetry System (JSATS) project supported by the U.S. Army Corps of Engineers, Portland District, has yielded the smallest acoustic fish tag transmitter commercially available to date. In order to study even smaller fish populations and make the transmitter injectable by needles, the JSATS acoustic micro transmitter needs to be further downsized. As part of the transmitter downsizing effort some of the design parameters of the lead zirconate titanate (PZT) ceramic tube transducer in the transmitter were studied, including the type of PZT, the backing material, the necessary drive voltage, the transmitting bandwidth and the length of the transducer. It was found that, to satisfy the 156-dB source level requirement of JSATS, a square wave with a 10-volt amplitude is required to drive 'soft' PZT transducers. PZT-5H demonstrated the best source level performance. For Navy types I and II, 16 volts or 18 volts were needed. Ethylene-propylene-diene monomer (EPDM) closed-cell foam was found to be the backing material providing the highest source level. The effect of tube length on the source level is also demonstrated in this paper, providing quantitative information for downsizing of small piezoelectric transmitters.
Li, Huidong; Deng, Zhiqun; Yuan, Yong; Carlson, Thomas J.
T-Lohi: A New Class of MAC Protocols for Underwater Acoustic Sensor Networks
and energy efficient design are important as we foresee many diverse applications for underwater sensor
Passive and Active Acoustics Using an Autonomous Wave Glider
) and autonomous underwater vehicles (AUVs) (or unmanned underwater vehicles (UUVs)), have reached a sufficiently developed wave glider has the potential to be an effective unmanned platform for acoustic ap- plications. We component in many marine operations. Robotic vehicles serve in an increasing variety of roles for scientific
Frandsen, Jannette B.
Active Classification: Theory and Application to Underwater Inspection
We discuss the problem in which an autonomous vehicle must classify an object based on multiple views. We focus on the active classification setting, where the vehicle controls which views to select to best perform the classification. The problem is formulated as an extension to Bayesian active learning, and we show connections to recent theoretical guarantees in this area. We formally analyze the benefit of acting adaptively as new information becomes available. The analysis leads to a probabilistic algorithm for determining the best views to observe based on information theoretic costs. We validate our approach in two ways, both related to underwater inspection: 3D polyhedra recognition in synthetic depth maps and ship hull inspection with imaging sonar. These tasks encompass both the planning and recognition aspects of the active classification problem. The results demonstrate that actively planning for informative views can reduce the number of necessary views by up to 80% when compared to passive methods...
Hollinger, Geoffrey A; Sukhatme, Gaurav S
energy-efficient design an important goal. While some researchers have suggested many underwater networks and consumes no energy from the sensor system. Compared to radio commu- nications, energy-efficient design
Idle-time Energy Savings Through Wake-up Modes in Underwater Acoustic Networks
(e.g., bit rate and latency) and in terms of energy consumption (i.e., transmit power, receive power the potential to use long term sensing devices and autonomous underwater vehicles (AUV) to explore the large transmission. To this end, researchers have begun devising MAC-layer protocols that minimize energy consumption
Scientific Solutions (TRL 5 6 Component) - Underwater Active Acoustic
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l LPROJECTS IN7 RoadmapProgram| Department1 (TextScience
Active micromixer using surface acoustic wave streaming
DOE Patents [OSTI]
An active micromixer uses a surface acoustic wave, preferably a Rayleigh wave, propagating on a piezoelectric substrate to induce acoustic streaming in a fluid in a microfluidic channel. The surface acoustic wave can be generated by applying an RF excitation signal to at least one interdigital transducer on the piezoelectric substrate. The active micromixer can rapidly mix quiescent fluids or laminar streams in low Reynolds number flows. The active micromixer has no moving parts (other than the SAW transducer) and is, therefore, more reliable, less damaging to sensitive fluids, and less susceptible to fouling and channel clogging than other types of active and passive micromixers. The active micromixer is adaptable to a wide range of geometries, can be easily fabricated, and can be integrated in a microfluidic system, reducing dead volume. Finally, the active micromixer has on-demand on/off mixing capability and can be operated at low power.
Branch; Darren W. (Albuquerque, NM), Meyer; Grant D. (Ithaca, NY), Craighead; Harold G. (Ithaca, NY)
Using optical communication for remote underwater robot operation
Underwater vehicles are typically operated using a tether or a slow acoustic link. We present an underwater optical communication system that enables a high-throughput and low-latency link to an underwater robot. The optical ...
Doniec, Marek Wojciech
Underwater Data Collection Using Robotic Sensor Networks
We examine the problem of utilizing an autonomous underwater vehicle (AUV) to collect data from an underwater sensor network. The sensors in the network are equipped with acoustic modems that provide noisy, range-limited ...
Hollinger, Geoffrey A.
On the Impacts and Benefits of Implementing Full-Duplex Communications Links in an Underwater Acoustic Network
. These networks may provide command and control for autonomous underwater vehicles, forward reporting by arraysOn the Impacts and Benefits of Implementing Full-Duplex Communications Links in an Underwater of sensor grids, ad hoc communications links to covert forces, or positive control of unmanned, forward
Xie, Geoffrey
Acoustic modes in combustors with complex impedances and multidimensional active
Acoustic modes in combustors with complex impedances and multidimensional active flames F. Nicoud-acoustic modes in combustors. In the case of a non-isothermal reacting medium, the wave equation for the pressure
Paris-Sud XI, Universit� de
4/17/2011 1 ACOUSTIC POLLUTION HOW HUMAN ACTIVITIES DISRUPT WILDLIFE COMMUNICATION Emily Hockman M of acoustic pollution in the oceans and effects on marine mammals Where do we go from here? #12;4/17/2011 2 ON ACOUSTIC POLLUTION Anthropogenic sound generation Transportation Army/Navy Research Commercial Birds
Gray, Matthew
Multi-Cluster Protocol for Ad Hoc Mobile Underwater Acoustic Networks Francisco Salv-Garau and Milica Stojanovic
of connectivity, successful transmission rate, average delay and energy consumption. Simulation analysis is used of network design is on a scalable multiple access technique which is applicable to varying coverage areas Underwater Vehicles. I. INTRODUCTION Autonomous operations future naval capability (AOFNC) calls
Experimental Results in Synchronous-Clock One-Way-Travel-Time Acoustic Navigation for Autonomous Underwater Vehicles
Architecture & Marine Engineering University of Michigan, Ann Arbor, MI 48109 email: firstname.lastname@example.com Department of Mechanical Engineering Johns Hopkins University, Baltimore, MD 21218 email: llw [1], [2], on the hull of a surface ship [3], or on sea-ice [4]. With a maximum acoustic range of 5
Whitcomb, Louis L.
Adaptive Routing in Underwater Delay/Disruption Tolerant Sensor Networks
, such as oceanographic data collection, pollution monitoring, offshore exploration, dis- aster prevention, assisted pose a range of challenges to underwater commu- nication and networking. Firstly, acoustic communication is usually employed in underwater sensor networks, and acoustic channels feature high error rate
Cui, Jun-Hong
Fountain Codes and their Application to Broadcasting in Underwater Networks
aim in this paper is to study the performance of broadcasting al- gorithms for underwater acoustic, Performance Keywords Underwater acoustic networks, broadcast, fountain codes, hybrid ARQ, modeling such as oceanographic data collection, pollution monitoring, offshore exploration, disaster prevention, etc., to name
Rossi, Michele
acoustic wave sensors: Topics by E-print Network
acoustic wave devices can be used as wireless sensor elements (SAW transponders Zachmann, Gabriel 30 Underwater Acoustic Sensor Networks: Research Challenges CiteSeer...
acoustic wave sensor: Topics by E-print Network
Autonomous adaptive acoustic relay positioning
We consider the problem of maximizing underwater acoustic data transmission by adaptively positioning an autonomous mobile relay so as to learn and exploit spatial variations in channel performance. The acoustic channel ...
Cheung, Mei Yi, S.M. Massachusetts Institute of Technology
Creation of cavitation activity in a microfluidic device through acoustically driven capillary waves
Creation of cavitation activity in a microfluidic device through acoustically driven capillary acoustic cavitation generated by ultrasonic vibrations in polydimethylsiloxane (PDMS) based microfluidic in the microfluidic channels. Also, it is observed that nuclei leading to intense inertial cavitation are generated
Ohl, Claus-Dieter
FINAL TECHNICAL REPORT: Underwater Active Acoustic Monitoring Network For Marine And Hydrokinetic Energy Projects
This project saw the completion of the design and development of a second generation, high frequency (90-120 kHz) Subsurface-Threat Detection Sonar Network (SDSN). The system was deployed, operated, and tested in Cobscook Bay, Maine near the site the Ocean Renewable Power Company TidGen� power unit. This effort resulted in a very successful demonstration of the SDSN detection, tracking, localization, and classification capabilities in a high current, MHK environment as measured by results from the detection and tracking trials in Cobscook Bay. The new high frequency node, designed to operate outside the hearing range of a subset of marine mammals, was shown to detect and track objects of marine mammal-like target strength to ranges of approximately 500 meters. This performance range results in the SDSN system tracking objects for a significant duration - on the order of minutes - even in a tidal flow of 5-7 knots, potentially allowing time for MHK system or operator decision-making if marine mammals are present. Having demonstrated detection and tracking of synthetic targets with target strengths similar to some marine mammals, the primary hurdle to eventual automated monitoring is a dataset of actual marine mammal kinematic behavior and modifying the tracking algorithms and parameters which are currently tuned to human diver kinematics and classification.
Stein, Peter J.; Edson, Patrick L.
E-Print Network 3.0 - acoustic experience shapes Sample Search...
Underwater Acoustic Summary: A. Aerial Channel Profiling The first set of experiments profile the aerial acoustic channel... . In these experiments, we use an IPAQ 5550, with a...
Demo 2: Integrated Communications for Underwater Operations By Dale Green
Demo 2: Integrated Communications for Underwater Operations By Dale Green Teledyne Benthos Inc. New forms of navigation aids for underwater vehicles are enabled through the use of acoustic communications for accomplishing these navigation functions simultaneously with a variety of communications functions. Each
A parallel hypothesis method of autonomous underwater vehicle navigation
This research presents a parallel hypothesis method for autonomous underwater vehicle navigation that enables a vehicle to expand the operating envelope of existing long baseline acoustic navigation systems by incorporating ...
LaPointe, Cara Elizabeth Grupe
Special Issue "Underwater Sensor Nodes and Underwater Sensor Networks" A special issue of Sensors (ISSN 1424-8220)
aquatic environments. Marine surveillance, pollution detection and monitoring, and oceanographic data (salinity, conductivity, turbidity, pH, oxygen, temperature, depth, etc.) - Sediments and pollution sensor nodes - Acoustic sensors - Underwater sensor network architectures - Wired and wireless protocols
Chen, Min
A Resilient Routing Algorithm for Long-term Applications in Underwater Sensor Networks
data collection, pollution moni- toring, offshore exploration, disaster prevention, assisted navigation, and tactical surveillance. Underwater acoustic networking is the enabling technology for these applica- tions of the underwater acoustic channel. A two-phase resilient routing solution for long-term monitoring missions
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, ACCEPTED FOR PUBLICATION 1 A QoS-aware Underwater Optimization Framework
.1- 1 s). Mobile Autonomous Underwater Vehicles (AUVs) can conserve energy by waiting for the `best, Autonomous Underwater Vehicles (AUVs), equipped with underwater sensors, are used for information gathering Optimization Framework for Inter-vehicle Communication using Acoustic Directional Transducers Baozhi Chen
active acoustic emission: Topics by E-print Network
methods such as acoustic emission as a global method associated to a local method such as TOFD technique which permits an accurate characterization and precise sizing of flaw...
Underwater manipulator
Self-contained, waterproof, water-submersible, remote-controlled apparatus is provided for manipulating a device, such as an ultrasonic transducer for measuring crack propagation on an underwater specimen undergoing shock testing. The subject manipulator includes metal bellows for transmittal of angular motions without the use of rotating shaft seals or O-rings. Inside the manipulator, a first stepper motor controls angular movement. In the preferred embodiment, the bellows permit the first stepper motor to move an ultrasonic transducer .+-.45 degrees in a first plane and a second bellows permit a second stepper motor to move the transducer .+-.10 degrees in a second plane orthogonal to the first. In addition, an XY motor-driven table provides XY motion.
Schrum, Phillip B. (Clairton, PA); Cohen, George H. (Pittsburgh, PA)
Self-contained, waterproof, water-submersible, remote-controlled apparatus is described for manipulating a device, such as an ultrasonic transducer for measuring crack propagation on an underwater specimen undergoing shock testing. The subject manipulator includes metal bellows for transmittal of angular motions without the use of rotating shaft seals or O-rings. Inside the manipulator, a first stepper motor controls angular movement. In the preferred embodiment, the bellows permit the first stepper motor to move an ultrasonic transducer [plus minus]45 degrees in a first plane and a second bellows permit a second stepper motor to move the transducer [plus minus]10 degrees in a second plane orthogonal to the first. In addition, an XY motor-driven table provides XY motion.
Schrum, P.B.; Cohen, G.H.
Acoustic Modes in Combustors with Complex Impedances and Multidimensional Active Flames
Acoustic Modes in Combustors with Complex Impedances and Multidimensional Active Flames F. Nicoud for computing the thermoacoustic modes in combustors. In the case of a nonisothermal reacting medium, the wave
Nicoud, Franck
061212-009 1 Abstract--A new generation of Autonomous Underwater
061212-009 1 Abstract-- A new generation of Autonomous Underwater Gliders is currently being-product of the project will be an autonomous powered glider that collects video, acoustic, and physical data scientific surveys will be performed to test the abilities of the new autonomous underwater vehicle (AUV
Wood, Stephen L.
Submesoscale Coastal Ocean Flows Detected By Very High Frequency Radar and Autonomous Underwater Vehicles
Submesoscale Coastal Ocean Flows Detected By Very High Frequency Radar and Autonomous Underwater, autonomous underwater vehicles (AUV), equipped with upward and downward- looking 1.2 MHz Acoustic Doppler and seven snapshots were subsequently time-averaged to form a mean profile from each experiment. In the down-wind
Shay, Lynn K. "Nick"
Field Test Experience of an Underwater Wireless Network in the Atlantic Ocean
collecting, marine surveillance and pollution detection [1]-[4]. However, due to the unique characteristics.e. a Teledyne Benthos underwater acoustic modem [6]). Fig. l. Deployment area On the software side, we use Aqua
Precision autonomous underwater navigation
Deep-sea archaeology, an emerging application of autonomous underwater vehicle (AUV) technology, requires precise navigation and guidance. As science requirements and engineering capabilities converge, navigating in the ...
Bingham, Brian S. (Brian Steven), 1973-
Efficient Error Recovery with Network Coding in Underwater Sensor Zheng Guo, Bing Wang, Peng Xie, Wei Zeng and Jun-Hong Cui
is efficient error recovery in the presence of high error probability, long propagation delays and low acoustic) the computational capability of underwater sensor nodes, and (2) the broadcast nature of acoustic channels of research, many critical underwater applications, such as oceanographic data collection, pollution
3D acoustic imaging applied to the Baikal Neutrino Telescope
A hydro-acoustic imaging system was tested in a pilot study on distant localization of elements of the Baikal underwater neutrino telescope. For this innovative approach, based on broad band acoustic echo signals and strictly avoiding any active acoustic elements on the telescope, the imaging system was temporarily installed just below the ice surface, while the telescope stayed in its standard position at 1100 m depth. The system comprised an antenna with four acoustic projectors positioned at the corners of a 50 meter square; acoustic pulses were "linear sweep-spread signals" - multiple-modulated wide-band signals (10-22 kHz) of 51.2 s duration. Three large objects (two string buoys and the central electronics module) were localized by the 3D acoustic imaging, with a accuracy of ~0.2 m (along the beam) and ~1.0 m (transverse). We discuss signal forms and parameters necessary for improved 3D acoustic imaging of the telescope, and suggest a layout of a possible stationary bottom based 3D imaging setup. The presented technique may be of interest for neutrino telescopes of km3-scale and beyond, as a flexible temporary or as a stationary tool to localize basic telescope elements, while these are completely passive.
K. G. Kebkal; R. Bannasch; O. G. Kebkal; A. I. Panfilov; R. Wischnewski
Routing Algorithms for Delay-insensitive and Delay-sensitive Applications in Underwater Sensor
will find applications in oceano- graphic data collection, pollution monitoring, offshore exploration acoustic networking is the en- abling technology for these applications. In this paper, an archi- tecture for three-dimensional underwater sensor networks is con- sidered, and a model characterizing the acoustic
Analysis of Algorithms for Multi-Modal Communications in Underwater Sensor Networks
acoustic messaging and the depth adjustment system still dominate the overall energy usage. For a given energy usage and packet loss into account. We perform an analysis of the algorithms and show,email@example.com,email@example.com ABSTRACT Acoustic communication typically dominates the power us- age in underwater sensor networks
Farritor, Shane
Experiments with Underwater Robot Localization and Tracking
navigation of unmanned underwater vehicles: a survey part 1:navigation of unmanned underwater vehicles: a survey part 2:
Corke, Peter; Detwiler, Carrick; Dunbabin, Matthew; Hamilton, Michael; Rus, Daniela; Vasilescu, Iuliu
Computer vision techniques for underwater navigation
USVs) and unmanned underwater vehicles (UUVs), splitting theUnmanned Vehicle Systems International (AUVSI) Au- tonomous Underwater Vehicle
Barngrover, Christopher M.
Adaptive RTT-driven Transport-layer Flow and Error Control Protocol for QoS Guaranteed Image Transmission over Multi-hop Underwater Wireless Networks: Design, Implementation, and Analysis
With the rapid advances in data transmission over various advanced underwater acoustic networks, it is important to develop the efficient protocol to obtain a high data-rate with Quality of Service (QoS) guarantee requirements for acoustic wireless...
Li, Jiahao
Receiver designs for multiuser underwater acoustic communications
Receiver block diagram employing SIC, ATR, MP, and a jointReceiver block diagram employing SIC, ATR, MP, and a joint
Cho, Steve E.
Vector Sensor Arrays in Underwater Acoustic Applications
and Sérgio M. Jesus1, 1 Institute for Systems and Robotics, University of Algarve, Campus de Gambelas, 8005 hydrophone arrays in ot
Jesus, Sérgio M.
BodyScope: A Wearable Acoustic Sensor for Activity Recognition
, speaking, laughing, and coughing. The F-measure of the Support Vector Machine classification of 12 of activities (e.g., eating, drinking, speaking, laughing and coughing) with BodyScope reveals that the system
Toronto, University of
MHD wave refraction and the acoustic halo effect around solar active regions - a 3D study
An enhancement in high-frequency acoustic power is commonly observed in the solar photosphere and chromosphere surrounding magnetic active regions. We perform 3D linear forward wave modelling with a simple wavelet pulse acoustic source to ascertain whether the formation of the acoustic halo is caused by MHD mode conversion through regions of moderate and inclined magnetic fields. This conversion type is most efficient when high frequency waves from below intersect magnetic field lines at a large angle. We find a strong relationship between halo formation and the equipartition surface at which the Alfv\\'en speed $a$ matches the sound speed $c$, lending support to the theory that photospheric and chromospheric halo enhancement is due to the creation and subsequent reflection of magnetically dominated fast waves from essentially acoustic waves as they cross $a=c$. In simulations where we have capped $a$ such that waves are not permitted to refract after reaching the $a=c$ height, halos are non-existent, which su...
Rijs, Carlos; Przybylski, Damien; Cally, Paul S
acoustic fluid structure: Topics by E-print Network
of a water-loaded structure excited by an impulse force is of interest for the acoustic stealth of submarines Paris-Sud XI, Universit de 49 Far-Field Underwater Explosion...
Acoustic waves in the atmosphere and ground generated by volcanic activity
This paper reports an interesting sequence of harmonic tremor observed in the 2011 eruption of Shinmoe-dake volcano, southern Japan. The main eruptive activity started with ashcloud forming explosive eruptions, followed by lava effusion. Harmonic tremor was transmitted into the ground and observed as seismic waves at the last stage of the effusive eruption. The tremor observed at this stage had unclear and fluctuating harmonic modes. In the atmosphere, on the other hand, many impulsive acoustic waves indicating small surface explosions were observed. When the effusion stopped and the erupted lava began explosive degassing, harmonic tremor started to be transmitted also to the atmosphere and observed as acoustic waves. Then the harmonic modes became clearer and more stable. This sequence of harmonic tremor is interpreted as a process in which volcanic degassing generates an open connection between the volcanic conduit and the atmosphere. In order to test this hypothesis, a laboratory experiment was performed and the essential features were successfully reproduced.
Ichihara, Mie; Lyons, John; Oikawa, Jun; Takeo, Minoru [Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032 (Japan); Instituto Geofisico, Escuela Politecnica Nacional, Ladron de Guevara E11-253, Aptdo 2759, Quito (Ecuador); Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032 (Japan)
A Mission Controller for High Level Control of Autonomous and Semi-Autonomous Underwater
A Mission Controller for High Level Control of Autonomous and Semi-Autonomous Underwater Vehicles to provide high-level control for autonomous and semi- autonomous vehicle operation. The mission controller autonomous AUVs, acoustically controlled AUVs and a new class of hybrid vehicle capable of operating both
Multi-Modal Communications in Underwater Sensor Networks Using Depth Adjustment
taking energy usage into account. We perform a preliminary analysis of the methods and show counterparts for minimizing energy usage and minimizing hop count. We find that while there are cer- tainly Acoustic communication typically dominates the power us- age in underwater sensor networks. As networks
Aqua-3D: An Underwater Network Animator Matthew Tran, Michael Zuba, Son Le, Yibo Zhu, Zheng Peng and Jun-Hong Cui
of applications, such as seismic monitoring of undersea oil fields, submarine detection, pollution monitoring environment. Acoustic signals are the primary form of com- munication used in UWSNs due to the limited range of radio signals underwater. Unfortunately, acoustic communication has a much longer propagation delay [4
NW-MILO Acoustic Data Collection
There is an enduring requirement to improve our ability to detect potential threats and discriminate these from the legitimate commercial and recreational activity ongoing in the nearshore/littoral portion of the maritime domain. The Northwest Maritime Information and Littoral Operations (NW-MILO) Program at PNNL�s Coastal Security Institute in Sequim, Washington is establishing a methodology to detect and classify these threats - in part through developing a better understanding of acoustic signatures in a near-shore environment. The purpose of the acoustic data collection described here is to investigate the acoustic signatures of small vessels. The data is being recorded continuously, 24 hours a day, along with radar track data and imagery. The recording began in August 2008, and to date the data contains tens of thousands of signals from small vessels recorded in a variety of environmental conditions. The quantity and variety of this data collection, with the supporting imagery and radar track data, makes it particularly useful for the development of robust acoustic signature models and advanced algorithms for signal classification and information extraction. The underwater acoustic sensing system is part of a multi-modal sensing system that is operating near the mouth of Sequim Bay. Sequim Bay opens onto the Straight of Juan de Fuca, which contains part of the border between the U.S. and Canada. Table 1 lists the specific components used for the NW-MILO system. The acoustic sensor is a hydrophone permanently deployed at a mean depth of about 3 meters. In addition to a hydrophone, the other sensors in the system are a marine radar, an electro-optical (EO) camera and an infra-red (IR) camera. The radar is integrated with a vessel tracking system (VTS) that provides position, speed and heading information. The data from all the sensors is recorded and saved to a central server. The data has been validated in terms of its usability for characterizing the signatures of small vessels. The sampling rate of 8 kHz and low pass filtering to 2 kHz results in an alias-free signal in the frequency band that is appropriate for small vessels. Calibration was performed using a Lubell underwater speaker so that the raw data signal levels can be converted to sound pressure. Background noise is present due to a nearby pump and as a result of tidal currents. More study is needed to fully characterize the noise, but it does not pose an obstacle to using the acoustic data for the purposes of vessel detection and signature analysis. The detection range for a small vessel was estimated using the calibrated voltage response of the system and a cylindrical spreading model for transmission loss. The sound pressure of a typical vessel with an outboard motor was found to be around 140 dB mPa, and could theoretically be detected from 10 km away. In practical terms, a small vessel could reliably be detected from 3 - 5 km away. The data is archived in netCDF files, a standard scientific file format that is "self describing". This means that each data file contains the metadata - timestamps, units, origin, etc. - needed to make the data meaningful and portable. Other file formats, such as XML, are also supported. A visualization tool has been developed to view the acoustic data in the form of spectrograms, along with the coincident radar track data and camera images.
Matzner, Shari; Myers, Joshua R.; Maxwell, Adam R.; Jones, Mark E.
On the Optimal Detection of an Underwater Intruder in a Channel Using Unmanned Underwater Vehicles
On the Optimal Detection of an Underwater Intruder in a Channel Using Unmanned Underwater Vehicles- water intruder in a channel using one or more unmanned underwater vehicles (UUVs). In particular and a corresponding optimized trajectory for each patroller. In numerical tests for one, two, and three underwater
Sastry, S. Shankar
Intelligent Planning for Autonomous Underwater Vehicles
such as the Mid-Atlantic Ridge 4 / 10 #12;Autonomous Underwater Vehicles Unmanned, untethered submersibles AutosubIntelligent Planning for Autonomous Underwater Vehicles Zeyn Saigol January 31, 2007 Supervisors Underwater Vehicles Classical planning systems Problem specification Markov Decision Processes 2 / 10 #12
Yao, Xin
Sound propagation around underwater seamounts
This thesis develops and utilizes a method for analyzing data from the North Pacific Acoustic Laboratory's (NPAL) Basin Acoustic Seamount Scattering Experiment (BASSEX). BASSEX was designed to provide data to support the ...
Sikora, Joseph J., III
Active control of passive acoustic fields: Passive synthetic apertureDoppler beamforming with data from an autonomous
from an autonomous vehicle Gerald L. D'Spain,a Eric Terrill, C. David Chadwell, Jerome A. Smith August 2006 The maneuverability of autonomous underwater vehicles AUVs equipped with hull-mounted arrays
Smith, Jerome A.
Comparison of simulations and data from a seismo-acoustic tank Jon M. Collisa
Comparison of simulations and data from a seismo-acoustic tank experiment Jon M. Collisa; revised 16 June 2007; accepted 19 June 2007 A tank experiment was carried out to investigate underwater surface backscattering.16 Although tank experiments of acoustic propagation have established
amongst Unmanned Underwater Vehicles (UUVs). Underwater networks face extreme challenges of low bandwidth amongst Unmanned Underwater Vehicles (UUVs). Underwater networks face extreme challenges of low bandwidth that the movement of underwater vehicles is not random and that it can be predicted or it is known beforehand
www.postersession.com Autonomous Underwater Vehicles of the Underwater Technology Laboratory
printed by www.postersession.com Autonomous Underwater Vehicles of the Underwater Technology.E. The development of an inexpensive autonomous oceanographic data acquisition system that is capable of operating at depths to 6000 meters. The system will comprise of four key components: 1) an autonomous underwater
autonomous underwater modeling: Topics by E-print Network
of rather expensive sensors such as Doppler Paris-Sud XI, Universit de 33 Design of an Autonomous Underwater Vehicle (AUV) charging system for underway, underwater...
Underwater Lighting by Submerged Lasers and Incandescent Sources
and collimated underwater incandescent projector. The laser-collimated underwater incandescent projector used for beamBY SUBMERGED LASERS and Incandescent Sources DESCRIPTIVE
Duntley, Seibert Q
Implementation of a wireless underwater video link
Autonomous underwater vehicles (AUVs) are increasingly being considered for remotely supervised missions, primarily for routine subsea inspection tasks currently performed by tethered remotely operated vehicles (ROVs). ...
Morash, James Paul
Development and Testing of an Acoustic Based Underwater Positioning System
Bowlus George Maul, Ph.D. Program Chair, Ocean Engineering Stephen Wood, Ph.D., P.E. Assistant Professor, Ocean Engineering Major Advisor Lee Harris, Ph.D., P.E. Associate Professor, Ocean Engineering Bachelor of Science Electrical Engineering Ohio University 2005 A thesis submitted to Florida Institute
Planning for Autonomous Underwater Vehicles Zeyn Saigol
, 2007 4 / 25 #12;Autonomous Underwater Vehicles Unmanned, untethered submersibles Autosub, developedPlanning for Autonomous Underwater Vehicles Zeyn Saigol Intelligent Robotics Lab meeting July 31 in Southampton Cheaper than manned vehicles Can get to places tethered vehicles can't No need for human
underwater vehicle which uses gravity for propulsion. Underwater gliders are winged underwater vehicles whichDYNAMICS & CONTROL OF UNDERWATER GLIDERS I: STEADY MOTIONS N. Mahmoudian, J. Geisbert, & C. Woolsey Blacksburg, VA 24060 www.unmanned.vt.edu June 6, 2009 Technical Report No. VaCAS-2007-01 Copyright c 2007 #12
Virginia Tech
Underwater Vehicles hal-00733797,version1-19Sep2012
to unmanned underwater vehicles (UUV). The UUV family is known to have two separate branches: the RemotelyUnderwater Vehicles hal-00733797,version1-19Sep2012 Author manuscript, published in "Underwater Vehicles (2009) 525-538" #12;hal-00733797,version1-19Sep2012 #12;Underwater Vehicles Edited by Alexander V
Acoustic transducer
An active acoustic transducer tool for use down-hole applications. The tool includes a single cylindrical mandrel including a shoulder defining the boundary of a narrowed portion over which is placed a sandwich-style piezoelectric tranducer assembly. The piezoelectric transducer assembly is prestressed by being placed in a thermal interference fit between the shoulder of the mandrel and the base of an anvil which is likewise positioned over the narrower portion of the mandrel. In the preferred embodiment, assembly of the tool is accomplished using a hydraulic jack to stretch the mandrel prior to emplacement of the cylindrical sandwich-style piezoelectric transducer assembly and anvil. After those elements are positioned and secured, the stretched mandrel is allowed to return substantially to its original (pre-stretch) dimensions with the result that the piezoelectric transducer elements are compressed between the anvil and the shoulder of the mandrel.
Drumheller, Douglas S. (Cedar Crest, NM)
Compact acoustic refrigerator
A compact acoustic refrigeration system actively cools components, e.g., electrical circuits, in a borehole environment. An acoustic engine includes first thermodynamic elements for generating a standing acoustic wave in a selected medium. An acoustic refrigerator includes second thermodynamic elements located in the standing wave for generating a relatively cold temperature at a first end of the second thermodynamic elements and a relatively hot temperature at a second end of the second thermodynamic elements. A resonator volume cooperates with the first and second thermodynamic elements to support the standing wave. To accommodate the high heat fluxes required for heat transfer to/from the first and second thermodynamic elements, first heat pipes transfer heat from the heat load to the second thermodynamic elements and second heat pipes transfer heat from first and second thermodynamic elements to the borehole environment. 18 figs.
Bennett, G.A.
A compact acoustic refrigeration system actively cools components, e.g., electrical circuits (22), in a borehole environment. An acoustic engine (12, 14) includes first thermodynamic elements (12) for generating a standing acoustic wave in a selected medium. An acoustic refrigerator (16, 26, 28) includes second thermodynamic elements (16) located in the standing wave for generating a relatively cold temperature at a first end of the second thermodynamic elements (16) and a relatively hot temperature at a second end of the second thermodynamic elements (16). A resonator volume (18) cooperates with the first and second thermodynamic elements (12, 16) to support the standing wave. To accommodate the high heat fluxes required for heat transfer to/from the first and second thermodynamic elements (12, 16), first heat pipes (24, 26) transfer heat from the heat load (22) to the second thermodynamic elements (16) and second heat pipes (28, 32) transfer heat from first and second thermodynamic elements (12, 16) to the borehole environment.
Bennett, Gloria A. (Los Alamos, NM)
Passive Acoustic Detection of Wind Turbine In-Flow Conditions for Active Control and Optimization
Wind is a significant source of energy; however, the human capability to produce electrical energy still has many hurdles to overcome. One of these is the unpredictability of the winds in the atmospheric boundary layer (ABL). The ABL is highly turbulent in both stable and unstable conditions (based on the vertical temperature profile) and the resulting fluctuations can have a dramatic impact on wind turbine operation. Any method by which these fluctuations could be observed, estimated, or predicted could provide a benefit to the wind energy industry as a whole. Based on the fundamental coupling of velocity fluctuations to pressure fluctuations in the nearly incompressible flow in the ABL, This work hypothesizes that a ground-based array of infrasonic pressure transducers could be employed to estimate the vertical wind profile over a height relevant for wind turbines. To analyze this hypothesis, experiments and field deployments were conducted. Wind tunnel experiments were performed for a thick turbulent boundary layer over a neutral or heated surface. Surface pressure and velocity probe measurements were acquired simultaneously. Two field deployments yielded surface pressure data from a 49 element array. The second deployment at the Reese Technology Center in Lubbock, TX, also included data from a smaller aperture, 96-element array and a 200-meter tall meteorological tower. Analysis of the data successfully demonstrated the ability to estimate the vertical velocity profile using coherence data from the pressure array. Also, dynamical systems analysis methods were successful in identifying and tracking a gust type event. In addition to the passive acoustic profiling method, this program also investigated a rapid response Doppler SODAR system, the optimization of wind turbine blades for enhanced power with reduced aeroacoustic noise production, and the implementation of a wireless health monitoring system for the wind turbine blades. Each of these other objectives was met successfully. The use of phase unwrapping applied to SODAR data was found to yield reasonable results for per-pulse measurements. A health monitoring system design analysis was able to demonstrate the ability to use a very small number of sensors to monitor blade health based on the blade's overall structural modes. Most notable was the development of a multi-objective optimization methodology that successfully yielded an aerodynamic blade design that produces greater power output with reduced aerodynamic loading noise. This optimization method could be significant for future design work.
Murray, Nathan E.
Contributions to automated realtime underwater navigation
This dissertation presents three separate-but related-contributions to the art of underwater navigation. These methods may be used in postprocessing with a human in the loop, but the overarching goal is to enhance vehicle ...
Stanway, Michael Jordan
Cooperative localization for autonomous underwater vehicles
Self-localization of an underwater vehicle is particularly challenging due to the absence of Global Positioning System (GPS) reception or features at known positions that could otherwise have been used for position ...
Bahr, Alexander
Biologically inspired underwater propulsion and adhesion mechanisms
The ultimate objective of this research is to develop an innovative underwater pipe inspection robot with both swimming and crawling capabilities as opposed to conventional in-pipe robots with wheeled designs or driven by ...
Pan, Yichao
Underwater communication via compact mechanical sound generation
Effective communication with underwater remotely operated vehicles (UROV) can be difficult to accomplish. In water, simple radio communication is quickly dissipated at higher frequencies and lower frequencies require a ...
Ubellacker, Wyatt
Analytic and numerical study of underwater implosion
Underwater implosion, the rapid collapse of a structure caused by external pressure, generates a pressure pulse in the surrounding water that is potentially damaging to adjacent structures or personnel. Understanding the ...
Gish, Lynn Andrew
XAUV : modular high maneuverability autonomous underwater vehicle
The design and construction of a modular test bed autonomous underwater vehicle (AUV) is analyzed. Although a relatively common stacked-hull design is used, the state of the art is advanced through an aggressive power ...
Walker, Daniel G. (Daniel George)
Design considerations for engineering Autonomous Underwater Vehicles
Autonomous Underwater Vehicles (AUVs) have been established as a viable tool for Oceanographic Sciences. Being untethered and independent, AUVs fill the gap in Ocean Exploration left by the existing manned submersible and ...
Shah, Vikrant P. (Vikrant Pankaj)
Robust planning for unmanned underwater vehicles
In this thesis, I design and implement a novel method of schedule and path selection between predetermined waypoints for unmanned underwater vehicles under uncertainty. The problem is first formulated as a mixed-integer ...
Frost, Emily Anne
Multi-reflective acoustic wave device
An acoustic wave device, which utilizes multiple localized reflections of acoustic wave for achieving an infinite impulse response while maintaining high tolerance for dampening effects, is disclosed. The device utilized a plurality of electromechanically significant electrodes disposed on most of the active surface. A plurality of sensors utilizing the disclosed acoustic wave mode device are also described.
Andle, Jeffrey C.
Automated Coordinator Synthesis for Mission Control of Autonomous Underwater Vehicles
Automated Coordinator Synthesis for Mission Control of Autonomous Underwater Vehicles S vehicles. The approach is aided by tools that allow graphical design, iterative redesign, and code autonomous underwater vehicle (AUV) programs to meet evolving requirements and capabilities. The hierarchical
Kumar, Ratnesh
Development of a low-cost underwater manipulator
This thesis describes the design, modeling, manufacture, and testing of a low cost, multiple degree-of-freedom underwater manipulator. Current underwater robotic arm technologies are often expensive or limited in functionality. ...
Cooney, Lauren Alise
Design of small, low-cost, underwater fin manipulator
This thesis details the development of a small, low cost, underwater manipulator for use on the XAUV. At this time, there are no cheap underwater servos commercially available. The design involves modifying a commercially ...
Roberts, Megan Johnson
Automatic Fish Classification for Underwater Species Behavior Understanding
Automatic Fish Classification for Underwater Species Behavior Understanding Concetto Spampinato an automatic fish classi- fication system that operates in the natural underwater en- vironment to assist marine biologists in understanding fish behavior. Fish classification is performed by combining two types
Fisher, Bob
Increasing Underwater Vehicle Autonomy by Reducing Energy Consumption
: Autonomous Underwater Vehicle, Minimum Energy Consumption, Optimal Control, Experiments. 1 IntroductionIncreasing Underwater Vehicle Autonomy by Reducing Energy Consumption M. Chybaa , T. Haberkornd , S, we concern ourselves with finding a control strategy that minimizes energy consumption along
Chyba, Monique
at an affordable cost. Not all autonomous underwater vehicles have been de- signed with environmental monitoringTOWARDS ENVIRONMENTAL MONITORING WITH THE AUTOSUB AUTONOMOUS UNDERWATER VEHICLE G Griffiths, N W this paper we describe some of the desirable characteristics of an autonomous underwater vehicle ca- pable
Griffiths, Gwyn
Underwater Computer Vision: Two Decades of Traditional Approaches
waters). Why is vision difficult in underwater? environment lighting medium Sensor & sensor platform #12) Why is vision difficult in underwater? environment lighting medium Sensor & sensor platform #12;7 Why is vision difficult in underwater? environment lighting medium Sensor & sensor platform 4. Poor positioning
Treuille, Adrien
SYSTEM IDENTIFICATION OF UNDERWATER VEHICLES Javier Pereira and Alec Duncan
.firstname.lastname@example.com Abstract - Unmanned underwater vehicles (UUV's) are used in a number of applications such as pipelineSYSTEM IDENTIFICATION OF UNDERWATER VEHICLES Javier Pereira and Alec Duncan Australian Maritime hydrodynamic derivative measurements from sea trials using an underwater vehicle which is a half-scale model
A New Compact Multichannel Receiver for Underwater Wireless Communication Networks
size of the proposed receiver makes it particularly useful for small unmanned underwater vehicles1 A New Compact Multichannel Receiver for Underwater Wireless Communication Networks Ali Abdi of the particle velocity, in addition to the pressure, multichannel reception can be accomplished in underwater
Abdi, Ali
Defense from a distance ORNL robotics sensors detect underwater
the development of unmanned, autonomous underwater vehicles with sensors that can scan areas, detect anomalies resources. Reporter 1 Retiree Newsletter Winter 2014 An unmanned, autonomous underwater vehicle surveys. With an efficient algorithm, the unmanned underwater vehicle can use the algorithm to under- stand what is being
Pennycook, Steve
A Control System for OFDM Networked Autonomous Underwater Vehicles
. INTRODUCTION Autonomous Underwater Vehicles (AUVs) belong to a group of unmanned robots that are usedA Control System for OFDM Networked Autonomous Underwater Vehicles Michael Zuba, Carlos Villa, haining.mo, zhengpeng, jiaxing.che, email@example.com Abstract--Autonomous Underwater Vehicle (AUV
been an ever increasing num- ber of applications for unmanned underwater vehicles (UUV) in variousIDENTIFICATION OF UNDERWATER VEHICLE HYDRODYNAMIC COEFFICIENTS USING FREE DECAY TESTS Andrew Ross the potential accuracy of these new methods. Copyright c 2004 IFAC. Keywords: Low-speed underwater vehicles
Johansen, Tor Arne
Fin Failure Compensation for an Unmanned Underwater Vehicle \\Lambda
Fin Failure Compensation for an Unmanned Underwater Vehicle \\Lambda Albert S.�F. Cheng and Naomi on a torpedo�shaped unmanned underwater vehicle (UUV) and design control laws to compensate for a fin that gets Island, is an unmanned underwater vehicle (UUV) representative of a class of UUV designed to have
Leonard, Naomi
A Multi-Vehicle Testbed for Underwater Motion Coordination
Collective Unmanned Underwater Labora- tory (SCUUL) testbed is a multi-vehicle testbed that is used. SCUUL is a multi-vehicle testbed consisting of six propellor-driven unmanned underwater vehicles (UUVsA Multi-Vehicle Testbed for Underwater Motion Coordination Nitin Sydney Department of Aerospace
Shapiro, Benjamin
STABILITY OF A BOTTOMHEAVY UNDERWATER VEHICLE NAOMI EHRICH LEONARD \\Lambda
completely autonomous. In order for unmanned underwater vehicles to succeed they must be able to control of an actuator failure on board an unmanned underwater vehicle, nonlinear control methods can be used for motionSTABILITY OF A BOTTOM�HEAVY UNDERWATER VEHICLE NAOMI EHRICH LEONARD \\Lambda Department
A microfluidics study of the triggering of underwater landslides by earthquakes M. El Bettah
of tsunamigenic landslides. Thus, both large- and small-scale experiments are performed; the former are standard to the point of liquefaction) caused by excess inter-granular pore pressures resulting from sesimic activity liquefaction; Underwater landslide. INTRODUCTION Although "co-seismic" tsunamis generated by earthquakes
Grilli, Stéphan T.
Design of an Autonomous Underwater Vehicle (AUV) charging system for underway, underwater recharging
Modern robotics have enabled the rapid proliferation of Autonomous Underwater Vehicles (AUVs) throughout the marine environment. As autonomy algorithms increase in robustness, complexity, and reliability, so too does the ...
Ewachiw, Mark Alexander, Jr
UNDERWATER PAINT MARKING OF PORPOISES1 Identification of individual animals has always been, and that was easy to apply at sea. Even a temporary mark permitting positive iden- tification for only a few hours would be a boon. Paint seemed an answer (Schevill 1966). Materials and Methods Several standard paint
UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging
UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging using ambient noise ............................................................................................... xviii SECTION 1: INTRODUCTION Chapter 1: Acoustic Daylight......................................................................... 1 1.2 Acoustic Daylight
Optical Delineation of Benthic Habitat Using an Autonomous Underwater Vehicle
To improve understanding and characterization of coastal regions, there has been an increasing emphasis on autonomous systems that can sample the ocean on relevant scales. Autonomous underwater vehicles (AUVs) with active propulsion are especially well suited for studies of the coastal ocean because they are able to provide systematic and near-synoptic spatial observations. With this capability, science users are beginning to integrate sensor suits for a broad range of specific and often novel applications. Here, the relatively mature Remote Environmental Monitoring Units (REMUS) AUV system is configured with multi-spectral radiometers to delineate benthic habitat in Sequim Bay, WA. The vehicle was deployed in a grid pattern along 5 km of coastline in depths from 30 to less than 2 meters. Similar to satellite and/or aerial remote sensing, the bandwidth ratios from the downward looking radiance sensor and upward looking irradiance sensor were used to identify beds of eelgrass on sub-meter scales. Strong correlations were found between the optical reflectance signals and the geo-referenced in situ data collected with underwater video within the grid. Results demonstrate the ability of AUVs to map littoral habitats at high resolution and highlight the overall utility of the REMUS vehicle for nearshore oceanography.
Moline, Mark A.; Woodruff, Dana L.; Evans, Nathan R.
Blue whale response to underwater noise from commercial ships
Accessing Noise Impact Acoustic pollution from ship noise isConcerns regarding acoustic noise pollution from ships ariseNoise pollution level metric for acoustic data collected at
McKenna, Megan Frances
Virtual long baseline (VLBL) autonomous underwater vehicle navigation using a single transponder
(cont.) Therefore, accurate underwater navigation using a single location transponder would provide dramatic time and cost savings for underwater vehicle operations. This thesis presents a simulation of autonomous underwater ...
Acoustic Heating Peter Ulmschneider
mechanisms. 1. The acoustic heating theory Only a few years after Edlen's (1941) discovery that the solar acoustic wave radiation- · b. field acoustic wave Figure 1. Panel a: Acoustic heating in late-type stars: effective temperature TeJ f, gravity g and mixing length parameter fr. Panel b: Acoustic heating in early
Ulmschneider, Peter
Cooperative control of autonomous underwater vehicles.
by Sandia National Laboratories. The Dy- iv namic Programming with Interior Points (DPIP) method was a very efficient method for path planning and performed well in the presence of system constraints. Finally all components of the system were integrated... a group of 10+ autonomous underwater vehicles, which cooperate in order to locate the aircraft. The search algorithm used in this system is based on a quadratic Newton method and was developed at Sandia National Laboratories. The method has already...
Savage, Elizabeth
A Geometric Analysis of Trajectory Design for Underwater Vehicles
of mechanical systems. We focus in this paper on autonomous underwater vehicles (AUVs). These fall holds true when considering energy consumption as the optimization cost. Moreover, implementingA Geometric Analysis of Trajectory Design for Underwater Vehicles M. Chyba, T. Haberkorn, G
Smith, Ryan N.
Real-time Collaborative Tracking for Underwater Networked Systems
technique can strategically trade off localization accuracy and energy consumption, achieving more than 50. INTRODUCTION There has been a growing interest in operating groups of autonomous underwater vehicles information is needed for con- trol and navigation of underwater vehicles, in early warning systems
Kastner, Ryan
An acoustic transducer is described comprising a one-piece hollow mandrel into the outer surface of which is formed a recess with sides perpendicular to the central axis of the mandrel and separated by a first distance and with a bottom parallel to the central axis and within which recess are a plurality of washer-shaped discs of a piezoelectric material and at least one disc of a temperature-compensating material with the discs being captured between the sides of the recess in a pre-stressed interference fit, typically at 2,000 psi of compressive stress. The transducer also includes a power supply and means to connect to a measurement device. The transducer is intended to be used for telemetry between a measurement device located downhole in an oil or gas well and the surface. The transducer is of an construction that is stronger with fewer joints that could leak fluids into the recess holding the piezoelectric elements than is found in previous acoustic transducers. 4 figs.
Drumheller, D.S.
An acoustic transducer comprising a one-piece hollow mandrel into the outer surface of which is formed a recess with sides perpendicular to the central axis of the mandrel and separated by a first distance and with a bottom parallel to the central axis and within which recess are a plurality of washer-shaped discs of a piezoelectric material and at least one disc of a temperature-compensating material with the discs being captured between the sides of the recess in a pre-stressed interference fit, typically at 2000 psi of compressive stress. The transducer also includes a power supply and means to connect to a measurement device. The transducer is intended to be used for telemetry between a measurement device located downhole in an oil or gas well and the surface. The transducer is of an construction that is stronger with fewer joints that could leak fluids into the recess holding the piezoelectric elements than is found in previous acoustic transducers.
Design and implementation of an underwater sound recording device
The purpose of this study was to design and build two versions of an underwater sound recording device. The device designed is referred to as the Underwater Sound Recorder (USR), which can be connected to one or two hydrophones or other underwater sound sensors. The URS contains a 26 dB preamplifier and a user selectable gain that permits additional amplification of input to the system from 26 dB to 46 dB. Signals within the frequency range up to 15 kHz may be recorded using the USR. Examples of USR applications are monitoring underwater processes that have the potential to create large pressure waves that could potentially harm fish or other aquatic life, such as underwater explosions or pile driving. Additional applications are recording sound generated by vessels or the vocalizations of some marine mammals, such as the calls from many species of whales.
Martinez, Jayson J.; Myers, Joshua R.; Carlson, Thomas J.; Deng, Zhiqun; Rohrer, John S.; Caviggia, Kurt A.
E-Print Network 3.0 - autonomous underwater vehicle Sample Search...
vehicle Search Powered by Explorit Topic List Advanced Search Sample search results for: autonomous underwater vehicle...
E-Print Network 3.0 - autonomous underwater vehicles Sample Search...
vehicles Search Powered by Explorit Topic List Advanced Search Sample search results for: autonomous underwater vehicles...
Interest of correlation-based automatic target recognition in underwater optical images: theoretical justification and first
In underwater mine warfare, unmanned underwater vehicles (UUVS) are used as a complement to divers, to detect Underwater Vehicles (AUVs). In a typical mine hunting scenario, the mothership uses its sonars to studyInterest of correlation-based automatic target recognition in underwater optical images
Boyer, Edmond
Pipeline inspection using an autonomous underwater vehicle
Pipeline inspection can be carried out by means of small Autonomous Underwater Vehicles (AUVs), operating either with a control link to a surface vessel, or totally independently. The AUV offers an attractive alternative to conventional inspection methods where Remotely Operated Vehicles (ROVs) or paravanes are used. A flatfish type AUV ``MARTIN`` (Marine Tool for Inspection) has been developed for this purpose. The paper describes the proposed types of inspection jobs to be carried out by ``MARTIN``. The design and construction of the vessel, its hydrodynamic properties, its propulsion and control systems are discussed. The pipeline tracking and survey systems, as well as the launch and recovery systems are described.
Egeskov, P.; Bech, M. [Maridan Aps., Hoersholm (Denmark); Bowley, R. [TSS Ltd., Weston-on-the-Green (United Kingdom); Aage, C. [Technical Univ. of Denmark, Lyngby (Denmark). Dept. of Ocean Engineering
Acoustic cryocooler
This patent describes an acoustic cryocooler with no moving parts is formed from a thermoacoustic driver (TAD) driving a pulse tube refrigerator (PTR) through a standing wave tube. Thermoacoustic elements in the TAD are spaced apart a distance effect to accommodate the increased thermal penetration length arising from the relatively low TAD operating frequency in the range of 15--60 Hz. At these low operating frequencies, a long tube is required to support the standing wave. The tube may be coiled to reduce the overall length of the cryocooler. One or two PTR's are located on the standing wave tube adjacent antinodes in the standing wave to be driven by the standing wave pressure oscillations. It is predicted that a heat input of 1000 W at 1000 K will maintain a cooling load of 5 W at 80 K.
Swift, G.W.; Martin, R.A.; Radebaugh, R.
An acoustic cryocooler with no moving parts is formed from a thermoacoustic driver (TAD) driving a pulse tube refrigerator (PTR) through a standing wave tube. Thermoacoustic elements in the TAD are spaced apart a distance effective to accommodate the increased thermal penetration length arising from the relatively low TAD operating frequency in the range of 15-60 Hz. At these low operating frequencies, a long tube is required to support the standing wave. The tube may be coiled to reduce the overall length of the cryocooler. One or two PTR's are located on the standing wave tube adjacent antinodes in the standing wave to be driven by the standing wave pressure oscillations. It is predicted that a heat input of 1000 W at 1000 K will maintian a cooling load of 5 W at 80 K.
Swift, Gregory W. (Santa Fe, NM); Martin, Richard A. (Los Alamos, NM); Radenbaugh, Ray (Louisville, CO)
An acoustic cryocooler with no moving parts is formed from a thermoacoustic driver (TAD) driving a pulse tube refrigerator (PTR) through a standing wave tube. Thermoacoustic elements in the TAD are spaced apart a distance effective to accommodate the increased thermal penetration length arising from the relatively low TAD operating frequency in the range of 15-60 Hz. At these low operating frequencies, a long tube is required to support the standing wave. The tube may be coiled to reduce the overall length of the cryocooler. One or two PTR's are located on the standing wave tube adjacent antinodes in the standing wave to be driven by the standing wave pressure oscillations. It is predicted that a heat input of 1000 W at 1000 K will maintain a cooling load of 5 W at 80 K. 3 figs.
Algorithms and analysis for underwater vehicle plume tracing.
The goal of this research was to develop and demonstrate cooperative 3-D plume tracing algorithms for miniature autonomous underwater vehicles. Applications for this technology include Lost Asset and Survivor Location Systems (L-SALS) and Ship-in-Port Patrol and Protection (SP3). This research was a joint effort that included Nekton Research, LLC, Sandia National Laboratories, and Texas A&M University. Nekton Research developed the miniature autonomous underwater vehicles while Sandia and Texas A&M developed the 3-D plume tracing algorithms. This report describes the plume tracing algorithm and presents test results from successful underwater testing with pseudo-plume sources.
Byrne, Raymond Harry; Savage, Elizabeth L. (Texas A& M University, College Station, TX); Hurtado, John Edward (Texas A& M University, College Station, TX); Eskridge, Steven E.
Sensor Data Processing for Tracking Underwater Threats Using Terascale Optical Core Devices
A critical aspect of littoral surveillance (including port protection) involves the localization and tracking of underwater threats such as manned or unmanned autonomous underwater vehicles. In this article, we present a methodology for locating underwater threat sources from uncertain sensor network data, and illustrate the threat tracking aspects using active sonars in a matched filter framework. The novelty of the latter paradigm lies in its implementation on a tera-scale optical core processor, EnLight , recently introduced by Lenslet Laboratories. This processor is optimized for array operations, which it performs in a fixed point arithmetic architecture at tera-scale throughput. Using the EnLight 64 prototype processor, our results (i) illustrate the ability to reach a robust tracking accuracy, and (ii) demonstrate that a considerable speed-up (a factor of over 13,000) can be achieved when compared to an Intel XeonTM processor in the computation of sets of 80K-sample complex Fourier transforms that are associated with our matched filter techniques.
Barhen, Jacob [ORNL; Imam, Neena [ORNL
The Acoustic Detection of Ultra High Energy Neutrinos
Attempts have been made to parameterise the thermoacoustic emission of particle cascades induced by EeV neutrinos interacting in the sea. Understanding the characteristic radiation from such an event allows us to predict the pressure pulse observed by underwater acoustic sensors distributed in kilometre scale arrays. We find that detectors encompassing thousands of cubic kilometres are required, with a minimum of 100 hydrophones per kilometre cubed, in order to observe the flux of neutrinos predicted by the attenuation of ultra high energy cosmic rays on cosmic microwave background photons. The pressure threshold of such an array must be in the range 5-10 mPa and the said detector will have to operate for five years or more. Additionally a qualitative analysis of the first acoustic data recorded by the Rona hydrophone array off the north-west coast of Scotland is reported.
J. Perkin
Autonomous underwater vehicle navigation and mapping in dynamic, unstructured environments
This thesis presents a system for automatically building 3-D optical and bathymetric maps of underwater terrain using autonomous robots. The maps that are built improve the state of the art in resolution by an order of ...
Kunz, Clayton Gregory
Touch at a distance : underwater object identification using pressure sensors
While the vast majority of underwater vehicles rely exclusively on sonar and vision to detect obstacles and maneuver, live fish also use their lateral line organ. The role played by the canal lateral line system is ...
Maertens, Audrey (Audrey Paulette Solange)
Decision algorithms for Unmanned Underwater Vehicles during offensive operations
The field of research involving autonomous vehicles has expanded greatly over the past decade. This thesis addresses the case of a system of Unmanned Underwater Vehicles (UUVs) operating in littoral areas in an offensive ...
Smith, Tyler B. (Tyler Bradford)
Design of an underwater vertical glider for subsea equipment delivery
Delivery of subsea equipment and sensors is generally accomplished with unguided sinking platforms or powered autonomous underwater vehicles (AUVs). An alternative would be to augment existing platforms with navigation and ...
Ambler, Charles Kirby
Toward autonomous underwater mapping in partially structured 3D environments
Motivated by inspection of complex underwater environments, we have developed a system for multi-sensor SLAM utilizing both structured and unstructured environmental features. We present a system for deriving planar ...
VanMiddlesworth, Mark (Mark Allen)
Large-area visually augmented navigation for autonomous underwater vehicles
This thesis describes a vision-based, large-area, simultaneous localization and mapping (SLAM) algorithm that respects the low-overlap imagery constraints typical of autonomous underwater vehicles (AUVs) while exploiting ...
Eustice, Ryan M
Design, Development and Testing of Underwater Vehicles: ITB Experience
The last decade has witnessed increasing worldwide interest in the research of underwater robotics with particular focus on the area of autonomous underwater vehicles (AUVs). The underwater robotics technology has enabled human to access the depth of the ocean to conduct environmental surveys, resources mapping as well as scientific and military missions. This capability is especially valuable for countries with major water or oceanic resources. As an archipelagic nation with more than 13,000 islands, Indonesia has one of the most abundant living and non-organic oceanic resources. The needs for the mapping, exploration, and environmental preservation of the vast marine resources are therefore imperative. The challenge of the deep water exploration has been the complex issues associated with hazardous and unstructured undersea and sea-bed environments. The paper reports the design, development and testing efforts of underwater vehicle that have been conducted at Institut Teknologi Bandung. Key technology areas...
Muljowidodo, Said D; Budiyono, Agus; Nugroho, Sapto A
Development of a snorkel for unmanned underwater vehicles
The development of unmanned underwater vehicles (UUV) has provided a bevy of opportunities for the exploration of the ocean. However, one limitation has kept UUVs from truly becoming mass produced, its limited range. The ...
Tia, Peter (Peter M.)
Finding a Middle Ground in the Protection of Underwater Cultural Heritage
The 2001 UNESCO Convention on the Protection of the Underwater Cultural Heritage bans the commercial exploitation of underwater cultural heritage. Despite this ban, �commercial exploitation� is not formally defined in the Convention and the only...
Gongaware, Laura Lynn
Decentralized sensor placement and mobile localization on an underwater sensor network with depth adjustment capabilities
Over 70% of our planet is covered by water. It is widely believed that the underwater world holds ideas and resources that will fuel much of the next generation of science and business. Unfortunately, underwater operations ...
Detweiler, Carrick (Carrick James)
Open loop performance of a biomimetic flapping foil autonomous underwater vehicle
Flapping foil propulsion is emerging as an alternative to conventional propulsion for underwater vehicles. MIT's Biomimetic Flapping Foil Autonomous Underwater Vehicle is a prototype vehicle that uses four three-dimensional ...
Wolf, Malima Isabelle, 1981-
Using Advanced Scientific Diving Technologies to Assess the Underwater Environment
Scientific diving can provide unique information for addressing complex environmental issues in the marine environment and is applied to a variety of increasingly important issues throughout Puget Sound, including habitat degradation, endangered species, biological availability of contaminants, and the effects of overwater structures and shoreline protection features. The Pacific Northwest National Laboratory, Battelle Marine Sciences Laboratory uses trained scientific divers in conjunction with advanced technologies to collect in-situ information best obtained through direct observation and requiring minimal environmental disturbance. For example, advances in underwater communications allow divers to discuss observations and data collection techniques in real time, both with each other and with personnel on the surface. Other examples include the use of Dual frequency IDentification SONar (DIDSON), an underwater camera used to capture digital images of benthic structures, fish, and organisms during low light and high turbidity levels; the use of voice-narrated underwater video; and the development of sediment collection methods yielding one-meter cores. The combination of using trained scientific SCUBA divers and advanced underwater technologies is a key element in addressing multifaceted environmental problems, resulting in a more comprehensive understanding of the underwater environment and more reliable data with which to make resource management decisions.
Southard, John A.; Williams, Greg D.; Sargeant, Susan L.; Diefenderfer, Heida L.; Blanton, Michael L.
Development of an underwater spin facility for combined environment testing
In response to a request from the US Government, Sandia National Laboratories has developed an instrumentation system to monitor the conditions along an underwater, rotating drive shaft. It was desired to study the structural integrity and signal acquisition capabilities of the Shaft Instrumentation System (SIS) in an environment which closely simulates the actual deployment conditions. In this manner, the SIS response to ill-defined conditions, such as flow field turbulence or temperature fluctuations, could be determined. An Underwater Spin Facility was developed in order to verify the operation of the instrumentation and telemetric data acquisition system in a combined environment of external pressure, transient axial loads and centrifugal force. The main components of the Underwater Spin Facility are a large, five foot diameter pressure vessel, a dynamically sealed shaft, a drive train assembly and a shaker table interface which is used to apply the axial loads. This paper presents a detailed description of the design of the Underwater Spin Facility. It also discusses the SIS certification test program in order to demonstrate the successful performance of the Underwater Spin Facility. 8 refs., 10 figs.
Roach, D.P.; Nusser, M.A.
Navigation and Control of the Nereus Hybrid Underwater Vehicle for Global Ocean Science to
Navigation and Control of the Nereus Hybrid Underwater Vehicle for Global Ocean Science to 11,000m an overview of the navigation and control system design for the new Nereus hybrid underwater vehicle Nereus hybrid underwater vehicle and summarizes the vehicle's navigation and control performance during
1756 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 57, NO. 3, MAY 2008 Silent Positioning in Underwater
of sensors and vehicles (the unmanned underwater vehicle (UUV), the autonomous under- water vehicle (AUV and provides location privacy at underwater vehicles/sensors whose locations need to be determined. To study fading channels. The obtained results indicate that UPS is an effective scheme for underwater vehicle
Cheng, Xiuzhen "Susan"
Architecture and Applications of Language-Centered Intelligence for Unmanned Underwater Vehicles
Architecture and Applications of Language-Centered Intelligence for Unmanned Underwater Vehicles and hypothetical reasoning, and expand the behavioral repertoire of unmanned underwater vehicles (UUVs). We begin and tested for teams of unmanned underwater vehicles capable of performing different cooperative missions
Idaho, University of
Diver-based control of a tethered unmanned underwater vehicle Andrew Speers and Michael Jenkin
Diver-based control of a tethered unmanned underwater vehicle Andrew Speers and Michael Jenkin: underwater robotics, human-robot communication Abstract: Human-robot communication with an underwater vehicle loss of the vehicle. Given this, the development of effective communication strate- gies for unmanned
Jenkin, Michael R. M.
Multi Stage Underwater Sensor Localization using Mobile Beacons
to perform, including: oceanographic data collection, ecological applications (e.g. pollution, water quality but they have to be revised due to acoustic channel properties. The acoustic channel has low bandwidth, high
Paparella, Francesco
Acoustics by additive manufacturing:.
??This study focuses on exploring the merging field of additive manufacturing and acoustics and introduces a new type of sound absorber which is regulating performance� (more)
Setaki, F.
Wave localization as a manifestation of ray chaos in underwater acoustics
Wave chaos is demonstrated by studying a wave propagation in a periodically corrugated wave-guide. In the limit of a short wave approximation (SWA) the underlying description is related to the chaotic ray dynamics. In this case the control parameter of the problem is characterized by the corrugation amplitude and the SWA parameter. The considered model is fairly suitable and tractable for the analytical analysis of a wave localization length. The number of eigenmodes characterized the width of the localized wave packet is estimated analytically.
A. Iomin; Yu. Bliokh
Alamouti Space Time Coded OFDM for Underwater Acoustic Channels Baosheng Li1
the time-variation of the channel. Adaptive channel estimation for space-time block coded (STBC) OFDM], [11]. Reference [9] discusses a jointly optimized MIMO-DFE with space- time trellis codes. In [10 stay fixed over the duration of one OFDM block, but may change from one block to another. Channel
Elastic parabolic equation solutions for underwater acoustic problems using seismic sources
, Washington 98105 Jon M. Collis Department of Applied Mathematics and Statistics, Colorado School of Mines.1121/1.4790355] PACS number(s): 43.30.Ma, 43.30.Dr, 43.20.Gp, 43.30.Zk [MS] Pages: 13581367 I. INTRODUCTION A class
Design of a low-cost underwater acoustic modem for short- range sensor networks
In deep water, the power loss caused by spreading isIn this case, sound power loss increases linearly with thecylindrical spreading, with power loss proportional to d ?
Benson, Bridget
modem must be powered from batteries Power amplifiers areof the modem and its batteries at node i. b i is a binaryplus the total number of batteries required times the cost
Doctoral Program on Electrical Engineering and Communications Signals and systems in Underwater Acoustics
in the ocean at high Ambient noise power due to: frequency with T = 25 C and sismic noise, thermic agitation
Jesus, S�rgio M.
Spectrally efficient underwater acoustic communications : channel characterization and design aspects for OFDM
input single-output (MISO) and the MIMO setting with a rank-assess the ergodic capacity of MISO and MIMO UWA channels byfor two cases: an N t � 1 MISO system and a 2 � 2 MIMO
Rado�evi?, Andreja
Cavitation controlled acoustic probe for fabric spot cleaning and moisture monitoring
A method and apparatus are provided for monitoring a fabric. An acoustic probe generates acoustic waves relative to the fabric. An acoustic sensor, such as an accelerometer is coupled to the acoustic probe for generating a signal representative of cavitation activity in the fabric. The generated cavitation activity representative signal is processed to indicate moisture content of the fabric. A feature of the invention is a feedback control signal is generated responsive to the generated cavitation activity representative signal. The feedback control signal can be used to control the energy level of the generated acoustic waves and to control the application of a cleaning solution to the fabric.
Sheen, Shuh-Haw (Naperville, IL); Chien, Hual-Te (Naperville, IL); Raptis, Apostolos C. (Downers Grove, IL)
Processing of Activated Core Components
Used activated components from the core of a NPP like control elements, water channels from a BWR, and others like in-core measurement devices need to be processed into waste forms suitable for interim storage, and for the final waste repository. Processing of the activated materials can be undertaken by underwater cutting and packaging or by cutting and high-pressure compaction in a hot cell. A hot cell is available in Germany as a joint investment between GNS and the Karlsruhe Research Center at the latter's site. Special transport equipment is available to transport the components ''as-is'' to the hot cell. Newly designed underwater processing equipment has been designed, constructed, and operated for the special application of NPP decommissioning. This equipment integrates an underwater cutting device with an 80 ton force underwater in-drum compactor.
Friske, A.; Gestermann, G.; Finkbeiner, R.
Integrated Short Term Navigation of a Towed Underwater Body \\Lambda
is con sidered. An underwater body, to be called here after the fish, is towed by a surface ship centimeters, the trajectory of the fish relative to its otherwise unknown initial position, during a few cated on board of the fish, can be integrated. INS measurements are known to track accurately the high
LeGland, François
Integrated Short Term Navigation of a Towed Underwater Body*
. An underwater body, to be called here- after the fish, is towed by a surface ship at the end of a few hundred of the fish relative to its otherwise unknown initial position, during a few minutes experiment, so, acceleration measurements pro- vided by an INS (inertial navigation system) lo- cated on board of the fish, can
POSITION ESTIMATION OF A TOWED UNDERWATER BODY \\Lambda
The following ocean engineering problem is considered. An underwater body, to be called hereafter the fish as a synthetic array, it is needed to know with an ac curacy of 10 cm, the trajectory of the fish relative of the fish, can be integrated. INS measurements are known to accurately de tect high frequency components
the value, quantity, and cost- effectiveness of scientific data obtained with these vehicles. This paperA SURVEY OF UNDERWATER VEHICLE NAVIGATION: RECENT ADVANCES AND NEW CHALLENGES James C. Kinsey Ryan M. Eustice Louis L. Whitcomb Department of Mechanical Engineering The Johns Hopkins University
Eustice, Ryan
Underwater noise of small personal watercraft Christine Erbea)
and Technology, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia C, Queensland, Australia. Underwater noise emissions consisted of broadband energy between 100 Hz and 10 kHz due Bramble Bay, Queensland, Australia, about 300m from shore, in 2.5m of water, in December 2008. They were
An Underwater Robotic Network for Monitoring Nuclear Waste Storage Pools
An Underwater Robotic Network for Monitoring Nuclear Waste Storage Pools Sarfraz Nawaz1 , Muzammil Manchester M60 1QD firstname.lastname@example.com email@example.com Abstract. Nuclear to build maps of their internal structure which can then be used for waste removal and pool decommissioning
Jeavons, Peter
Optimal Node Placement in Underwater Wireless Sensor Networks
. Autonomous Underwater Vehicles (AUVs) have been used in recent years to monitor and collect data from that cover a sparse area need to be optimally placed to reduce per node energy consumption. As the distance between the nodes increases, more energy is required to maintain a reasonable Signal-to-Noise (SNR) value
Shihada, Basem
STOCHASTIC SEISMIC EMISSION FROM ACOUSTIC GLORIES AND THE QUIET SUN A.-C. DONEA1, C. LINDSEY2 and D; accepted 8 January 2000) Abstract. Helioseismic images of multipolar active regions show enhanced seismic'. The acoustic glories contain elements that sustain an average seismic emission 50% greater than similar
Braun, Douglas C.
Mapping of Submerged Aquatic Vegetation Using Autonomous Underwater Vehicles in Nearshore Regions
The use of an autonomous underwater vehicle (AUV) equipped with sidescan sonar was investigated for determining the boundaries of nearshore submerged aquatic vegetation beds, specifically eelgrass (Zostera marina). Shifts in eelgrass bed morphology, size, and distribution are used as indicators in monitoring programs to measure the impacts of coastal development and environmental stressors on eelgrass and to establish the efficacy of restoration programs. However, many monitoring programs necessarily extend over multiple-year time periods. Therefore, techniques that are easily reproducible, accurate, and cost-effective can demonstrate distinct advantages over some of the more traditional and labor-intensive methods, such as diver assessments and transects of shoot counts. Remote monitoring of eelgrass beds using satellite and aerial imagery has been demonstrated with moderate success, but requires groundtruthing, which can be costly and which frequently cannot delineate the deeper boundaries of eelgrass beds. One possible means for low-cost mapping is the use of AUVs equipped with acoustic imaging hardware. AUVs provide an ideal platform, because they can be deployed by small teams (two people), they are highly maneuverable, they can cover large areas over a relatively short time period (3knot operational speed), and they are equipped with multiple oceanographic instruments for correlated data collection. This paper describes the use of sidescan-equipped AUV technology deployed over multiple time periods at the same location where imagery of eelgrass beds was obtained and analyzed for comparative purposes.
Jones, Mark E.; Miller, Lee M.; Woodruff, Dana L.; Ewert, Daniel W.
Acoustic cooling engine
An acoustic cooling engine with improved thermal performance and reduced internal losses comprises a compressible fluid contained in a resonant pressure vessel. The fluid has a substantial thermal expansion coefficient and is capable of supporting an acoustic standing wave. A thermodynamic element has first and second ends and is located in the resonant pressure vessel in thermal communication with the fluid. The thermal response of the thermodynamic element to the acoustic standing wave pumps heat from the second end to the first end. The thermodynamic element permits substantial flow of the fluid through the thermodynamic element. An acoustic driver cyclically drives the fluid with an acoustic standing wave. The driver is at a location of maximum acoustic impedance in the resonant pressure vessel and proximate the first end of the thermodynamic element. A hot heat exchanger is adjacent to and in thermal communication with the first end of the thermodynamic element. The hot heat exchanger conducts heat from the first end to portions of the resonant pressure vessel proximate the hot heat exchanger. The hot heat exchanger permits substantial flow of the fluid through the hot heat exchanger. The resonant pressure vessel can include a housing less than one quarter wavelength in length coupled to a reservoir. The housing can include a reduced diameter portion communicating with the reservoir. The frequency of the acoustic driver can be continuously controlled so as to maintain resonance.
Hofler, Thomas J. (Los Alamos, NM); Wheatley, John C. (Los Alamos, NM); Swift, Gregory W. (Santa Fe, NM); Migliori, Albert (Santa Fe, NM)
Acoustical heat pumping engine
The disclosure is directed to an acoustical heat pumping engine without moving seals. A tubular housing holds a compressible fluid capable of supporting an acoustical standing wave. An acoustical driver is disposed at one end of the housing and the other end is capped. A second thermodynamic medium is disposed in the housing near to but spaced from the capped end. Heat is pumped along the second thermodynamic medium toward the capped end as a consequence both of the pressure oscillation due to the driver and imperfect thermal contact between the fluid and the second thermodynamic medium. 2 figs.
Wheatley, J.C.; Swift, G.W.; Migliori, A.
The disclosure is directed to an acoustical heat pumping engine without moving seals. A tubular housing holds a compressible fluid capable of supporting an acoustical standing wave. An acoustical driver is disposed at one end of the housing and the other end is capped. A second thermodynamic medium is disposed in the housing near to but spaced from the capped end. Heat is pumped along the second thermodynamic medium toward the capped end as a consequence both of the pressure oscillation due to the driver and imperfect thermal contact between the fluid and the second thermodynamic medium.
Wheatley, John C. (Los Alamos, NM); Swift, Gregory W. (Los Alamos, NM); Migliori, Albert (Santa Fe, NM)
Acoustic well cleaner
A method and apparatus are disclosed for cleaning the wellbore and the near wellbore region. A sonde is provided which is adapted to be lowered into a borehole and which includes a plurality of acoustic transducers arranged around the sonde. Electrical power provided by a cable is converted to acoustic energy. The high intensity acoustic energy directed to the borehole wall and into the near wellbore region, redissolves or resuspends the material which is reducing the permeability of the formation and/or restricting flow in the wellbore.
Maki, Jr., Voldi E. (11904 Bell Ave., Austin, TX 78759-2415); Sharma, Mukul M. (Dept. of Petroleum Engr. Univ. of Texas, Austin, TX 78712)
Underwater wireless communications have witnessed major developments in recent years, especially in the last decade. While the first generation of applications involved just a single transmitter and receiver communicating at low bit-rates, nowadays un-
with controllable speed, and Underwater Autonomous Vehicles (AUVs), following either pre-established paths or moving: · Energy consumption for every single node while actively transmitting, actively receiving, sleeping or being idle, energy consumption for every single packet, total energy consumption of the network. · End
Active control of underwater propulsor using shape memory alloys
of submarines10 as control surface deflection tabs and linear actuators in biomimetic hydrofoils11-12. The material chosen in many of these studies and research applications is the Shape Memory Alloy (SMA). This material is attractive due to its small size... section. The water tunnel is powered by a Baldor 25-hp electric motor and with the cross-section specified above allows for a maximum velocity of approximately 1 m/s. To be ab le to obtain reliable data from the test run of the 2-D hydrofoil...
Wasylyszyn, Jonathan Allen
Reduction of unsteady underwater propeller forces via active tail articulation
This study investigates the use of biologically-inspired tail articulation as a means to reduce unsteady propeller forces and by extension, noise due to stator wake blade interaction. This study is experimental in nature ...
James, Richard A. (Richard Alexander), 1982-
E-Print Network 3.0 - artificial underwater structure Sample...
Invertebrate Biomass in Skate Nurseries Gerald R. Hoff Summary: skate in Pribilof Canyon by an autonomous underwater vehicle show higher abundance of invertebrates... on...
Autonomous adaptive environmental assessment and feature tracking via autonomous underwater vehicles
In the underwater environment, spatiotemporally dynamic environmental conditions pose challenges to the detection and tracking of hydrographic features. A useful tool in combating these challenge is Autonomous Adaptive ...
Petillo, Stephanie Marie
E-Print Network 3.0 - acceleration employing underwater Sample...
Sciences 5 Proceedings of the 2001 IEEE International Conference on Robotics & Automation Summary: -26, 2001 Control of Underwater ManipulatorsMounted on nn ROV Using...
E-Print Network 3.0 - acoustic oscillations iii Sample Search...
University of California at Santa Barbara Collection: Engineering 42 Analogy Electromagnetism -Acoustics: Validation and Application to Local Impedance Active Control for...
Exploring Architectural Challenges in Scalable Underwater Wireless Sensor Networks
on climate and living conditions of plants and animals Marine microorganism Pollution Disaster early Acoustic channels adopted · Limited bandwidth: Bandwidth �? Range product = 40 kbps·km · Long delay: 1.48 x node Sensor probes Interface circuitry Controller (processors) Trans-receiver Acoustic modem
Shi, Zhijie Jerry
AquaNodes: An Underwater Sensor Network Iuliu Vasilescu
modem and an optical mo- dem implemented using green light. The system of sensor nodes communicates communication and support for sensing and mobil- ity. The nodes in the system are connected acoustically for broadcast communication using an acoustic modem we de- veloped. For higher point to point communication
and an optical mo- dem implemented using green light. The system of sensor nodes communicates with a TDMA communication and support for sensing and mobil- ity. The nodes in the system are connected acoustically for broadcast communication using an acoustic modem we de- veloped. For higher point to point communication
Spacetime transformation acoustics
A recently proposed analogue transformation method has allowed the extension of transformation acoustics to general spacetime transformations. We analyze here in detail the differences between this new analogue transformation acoustics (ATA) method and the standard one (STA). We show explicitly that STA is not suitable for transformations that mix space and time. ATA takes as starting point the acoustic equation for the velocity potential, instead of that for the pressure as in STA. This velocity-potential equation by itself already allows for some transformations mixing space and time, but not all of them. We explicitly obtain the entire set of transformations that do not leave its form invariant. It is in these cases that ATA shows its true potential, allowing for building a transformation acoustics method that enables the full range of spacetime transformations. We provide an example of an important transformation which cannot be achieved with STA. Using this transformation, we design and simulate an acoustic frequency converter via the ATA approach. Furthermore, in those cases in which one can apply both the STA and ATA approaches, we study the different transformational properties of the corresponding physical quantities.
C. Garc�a-Meca; S. Carloni; C. Barcel�; G. Jannes; J. S�nchez-Dehesa; A. Mart�nez
Suave: Swarm Underwater Autonomous Vehicle Localization Jun Liu, Zhaohui Wang, Zheng Peng, Jun-Hong Cui and Lance Fiondella
Suave: Swarm Underwater Autonomous Vehicle Localization Jun Liu, Zhaohui Wang, Zheng Peng, Jun. This paper de- velops the "Suave" (Swarm underwater autonomous vehicle localization) algorithm to localize significantly improves localization accuracy, lowers energy consumption, and the probability of swarm detection
Simulating Human Reasoning in Mine-Like Object Inspection Assignments for a Formation of Unmanned Underwater Vehicles
of a fleet of unmanned underwater vehicles. Learning from the complexities involved in information processing in real life scenarios, decision making processes by a fleet of unmanned underwater vehicles can planner for a decentralized fleet of unmanned underwater vehicles was implemented, followed by a look
OCEAN SCIENCE APPLICATIONS FOR AUTONOMOUS UNDERWATER VEHICLES -THE WORKPLAN FOR AUTOSUB-1 for 1997-2000 AND BEYOND.
, Southampton, SO14 3ZH UK Presented at the Unmanned Underwater Vehicle Showcase, September 1997 SouthamptonOCEAN SCIENCE APPLICATIONS FOR AUTONOMOUS UNDERWATER VEHICLES - THE WORKPLAN FOR AUTOSUB-1 for email@example.com www: http://www.soc.soton.ac.uk/OTD #12;OCEAN SCIENCE APPLICATIONS FOR AUTONOMOUS UNDERWATER VEHICLES
Princeton -Weekly Bulletin 06/14/04 -Grants fund research on underwater vehicles, high-tech materials June 14, 2004
Princeton - Weekly Bulletin 06/14/04 - Grants fund research on underwater vehicles, high research on underwater vehicles, high- tech materials By Steven Schultz Princeton NJ -- University mobile unmanned networks of underwater sensors and to develop new high-tech materials. The Department
Aksay, Ilhan A.
Underwater Unmanned Vehicle Boeing gave us the opportunity to compete against the Electrical Engineering Dept. The competition was
Underwater Unmanned Vehicle Overview Boeing gave us the opportunity to compete against Underwater Unmanned Vehicles. Basically we had to build remote controlled submarines from the ground up. Objectives To design a Underwater Unmanned Vehicle that meets the following Specs: Has an internal Ballast
Demirel, Melik C.
Feasibility of Underwater Sensor Networks for Lifetime Assessment of Offshore Civil Structures
Feasibility of Underwater Sensor Networks for Lifetime Assessment of Offshore Civil Structures is to investigate the feasibility of underwater sensor networks for offshore and deep-sea structural monitoring. In this paper, the network communication topology and in-network processing algorithm for two offshore wind
Autonomous Control of an Autonomous Underwater Vehicle Towing a Vector Sensor Array
Autonomous Control of an Autonomous Underwater Vehicle Towing a Vector Sensor Array Michael R,email@example.com Abstract-- This paper is about the autonomous control of an autonomous underwater vehicle (AUV the ability to deploy large sets of autonomous mobile marine platforms over a wide area of the ocean
Schmidt, Henrik
Development of a Dynamic Model of a Small High-Speed Autonomous Underwater Vehicle
Development of a Dynamic Model of a Small High-Speed Autonomous Underwater Vehicle Haider N. Arafat-- A dynamic model is developed for a small, high- speed autonomous underwater vehicle. The vehicle has manner: 1) Wind angle and angle : From u = V cos , v = V sin sin , and w = V sin cos , we have tan
1202 IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 46, NO. 5, MAY 1998 Classification of Underwater Mammals
1202 IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 46, NO. 5, MAY 1998 Classification of Underwater Cooper, Nathan Intrator, and Harel Shouval Abstract--Underwater mammal sound classification is demon and different wavelet representations are stud- ied. The system achieves outstanding classification performance
Intrator, Nathan
Oce@Nyd: A new Tailorable Groupware for Digital Media collection for Underwater Virtual Environments
Oce@Nyd: A new Tailorable Groupware for Digital Media collection for Underwater Virtual architecture devoted to the collection of Digital media for underwater virtual environ- ments. The proposed- ferent digital media (image, video, audio, 3D models, etc.), and on the other hand, certain services can
Field Trials of the Nereus Hybrid Underwater Robotic Vehicle in the Challenger Deep of the
Field Trials of the Nereus Hybrid Underwater Robotic Vehicle in the Challenger Deep of the Mariana of the Nereus hybrid underwater robotic vehicle (HROV) conducted in May and June 2009 in the Challenger Deep. INTRODUCTION On May 31, 2009 the Nereus hybrid remotely operated vehicle (HROV) successfully completed its
QUO VADIS: QoS-aware Underwater Optimization Framework for Inter-vehicle Communication using
Underwater Vehicles (AUVs) can conserve energy by waiting for the `best' network topology configuration, e communication energy consumption by adjusting the transducer directivity on-the-fly. I. INTRODUCTION Under explorations, Autonomous Underwater Vehicles (AUVs), equipped with un- derwater sensors, are used
Efficient control of an autonomous underwater vehicle while accounting for thruster failure
Efficient control of an autonomous underwater vehicle while accounting for thruster failure Thomas to both time and energy consumption. The main characteristic of our algorithm is that it produces the autonomous underwater vehicle is submerged. Such failures may or may not affect the controllability
TOWARDS SONAR BASED PERCEPTION AND MODELLING FOR UNMANNED UNTETHERED UNDERWATER VEHICLES B. Steer will be of critical importance in the development of flexible, adaptive and useful unmanned underwater vehicles will be of critical importance in the de- velopment of flexible, adaptive and useful unmanned un- derwater vehicles
Garner, Philip N.
Underwater Sensor Networking: Research Challenges and Potential Applications
synchronization, and localization protocols for high- latency acoustic networks, long-duration network sleeping SCADA systems, but in- creasingly with more rapidly deployed sensor networks [39]. Advances in reducing
Corrosion Resistant Cladding by YAG Laser Welding in Underwater Environment
It is known that stress-corrosion cracking (SCC) will occur in nickel-base alloys used in Reactor Pressure Vessel (RPV) and Internals of nuclear power plants. A SCC sensitivity has been evaluated by IHI in each part of RPV and Internals. There are several water level instrumentation nozzles installed in domestic BWR RPV. In water level instrumentation nozzles, 182 type nickel-base alloys were used for the welding joint to RPV. It is estimated the SCC potential is high in this joint because of a higher residual stress than the yield strength (about 400 MPa). This report will describe a preventive maintenance method to these nozzles Heat Affected Zone (HAZ) and welds by a corrosion resistant cladding (CRC) by YAG Laser in underwater environment (without draining a reactor water). There are many kinds of countermeasures for SCC, for example, Induction Heating Stress Improvement (IHSI), Mechanical Stress Improvement Process (MSIP) and so on. A YAG laser CRC is one of them. In this technology a laser beam is used for heat source and irradiated through an optical fiber to a base metal and SCC resistant material is used for welding wires. After cladding the HAZ and welds are coated by the corrosion resistant materials so their surfaces are improved. A CRC by gas tungsten arc welding (GTAW) in an air environment had been developed and already applied to a couple of operating plants (16 Nozzles). This method was of course good but it spent much time to perform because of an installation of some water-proof working boxes to make a TIG-weldability environment. CRC by YAG laser welding in underwater environment has superior features comparing to this conventional TIG method as follows. At the viewpoint of underwater environment, (1) an outage term reduction (no drainage water). (2) a radioactive exposure dose reduction for personnel. At that of YAG laser welding, (1) A narrower HAZ. (2) A smaller distortion. (3) A few cladding layers. A YAG laser CRC test in underwater environment was carried out in the different welding position, horizontal, vertical upward and downward. The soundness of cladding layers (about 3 mm) is confirmed in visual and penetration test, and cross section observation. In the application to the actual plants, it is preferable to reduce the start and end point numbers of beads with which a defect is easy to cause. Therefore a special welding equipment for a YAG laser CRC that could weld continuously was developed. (authors)
Tsutomi Kochi; Toshio Kojima; Suemi Hirata; Ichiro Morita; Katsura Ohwaki [Ishikawajima-Harima Heavy Industries Company Ltd., 1 Shin-Nakaharacho, Isogoku, Yokohama 235-8501 (Japan)
Underwater nuclear power plants: improved safety, environmental compatibility and efficiency
The further development of nuclear power engineering depends on the creation of a new generation of nuclear power plant (NPP) projects that have a high degree of safety. Decisions ensuring secure NPP exploitation must be based on the possibility of eliminating or localizing accidents. Using environmental properties to achieve secure NPP exploitation and accident elimination leads to suggest the construction of NPPs in water. An efficient way to provide energy to remote coastal areas is through use of floatable construction of prefabricated units. Floatable construction raises the quality of works, reduces expenditures on industrial facilities, and facilities building conditions in districts with extreme climatic conditions. A type of NPP that is situated on a shelf with the reactor compartment placed at the sea bottom is proposed. The underwater location of the reactor compartment on the fixed depth allows the natural water environment conditions of natural hydrostatic pressure, heat transfer and circulation to provide NPP safety. An example of new concept for power units with under-water localization of the reactor compartment is provided by the double-block NPP in a VVER reactor.
Galustov, K.Z.; Abadjyan, K.A.; Pavlov, A.B.
Aluminum-Enhanced Underwater Electrical Discharges for Steam Explosion Triggering
For a number of years, we have been initiating steam explosions of single drops of molten materials with pressure and flow (bubble growth) transients generated by discharging a capacitor bank through gold bridgewires placed underwater. Recent experimental and theoretical advances in the field of steam explosions, however, have made it important to substantially increase these relatively mild transients in water without using high explosives, if possible. To do this with the same capacitor bank, we have discharged similar energies through tiny strips of aluminum foil submerged in water. By replacing the gold wires with the aluminum strips, we were able to add the energy of the aluminum-water combustion to that normally deposited electrically by the bridgewire explosion in water. The chemical enhancement of the explosive characteristics of the discharges was substantial: when the same electrical energies were discharged through the aluminum strips, peak pressures increased as much as 12-fold and maximum bubble volumes as much as 5-fold above those generated with the gold wires. For given weights of aluminum, the magnitudes of both parameters appeared to exceed those produced by the underwater explosion of equivalent weights of high explosives.
Near-Real-Time Acoustic Monitoring of Beaked Whales and Other Cetaceans Using a SeagliderTM
temporal and spatial resolution in near-real time. Here we describe an autonomous underwater vehicle for new, cost- effective tools that allow scientists to monitor areas of interest autonomously with high anthropogenic activities such as seismic exploration for sub-sea fossil fuels or naval sonar exercises
Baird, Robin W.
Truck acoustic data analyzer system
A passive vehicle acoustic data analyzer system having at least one microphone disposed in the acoustic field of a moving vehicle and a computer in electronic communication the microphone(s). The computer detects and measures the frequency shift in the acoustic signature emitted by the vehicle as it approaches and passes the microphone(s). The acoustic signature of a truck driving by a microphone can provide enough information to estimate the truck speed in miles-per-hour (mph), engine speed in rotations-per-minute (RPM), turbocharger speed in RPM, and vehicle weight.
Haynes, Howard D.; Akerman, Alfred; Ayers, Curtis W.
Acoustic Character Of Hydraulic Fractures In Granite
Hydraulic fractures in homogeneous granitic rocks were logged with conventional acoustic-transit-time, acoustic-waveform, and acoustic-televiewer logging systems. Fractured intervals ranged in depth from 45 to 570m. and ...
Paillet, Frederick I.
Acoustic cavitation and its chemical consequences
Acoustic cavitation and its chemical consequences By Kenneth S. Suslick, Yuri Didenko, Ming M. Fang Acoustic cavitation is responsible for both sonochemistry and sonoluminescence. Bubble collapse in liquids, sonochemistry and sonoluminescence derive principally from acoustic cavitation: the formation, growth
Suslick, Kenneth S.
A constant-mass fuel delivery system for use in underwater autonomous vehicles
This thesis describes the design and assembly of two constant-mass fuel tanks to be used in autonomous underwater vehicles (AUVs). The fuel tanks are part of a power supply designed to increase AUV endurance without limiting ...
Saxton-Fox, Theresa Ann
Development and validation of a conceptual design program for unmanned underwater vehicles
With a renewed focus on the Asia-Pacific region, the United States Navy will increasingly rely on high-endurance unmanned underwater vehicles (UUVs) to support successful operations in a challenging threat environment. ...
Laun, Alexander Walter, Ensign
Biomimetic oscillating foil propulsion to enhance underwater vehicle agility and maneuverability
Inspired by the swimming abilities of marine animals, this thesis presents "Finnegan the RoboTurtle", an autonomous underwater vehicle (AUV) powered entirely by four flapping foils. Biomimetic actuation is shown to produce ...
Licht, Stephen Carl
Dynamic response and maneuvering strategies of a hybrid autonomous underwater vehicle in hovering
The Odyssey IV autonomous underwater vehicle (AUV) is the next generation of unmanned subsurface robots from the MIT Sea Grant AUV Laboratory. The Odyssey IV AUV has a novel propulsion system, which includes a pair of ...
Verification of a six-degree of freedom simulation model for the REMUS autonomous underwater vehicle
mproving the performance of modular, low-cost autonomous underwater vehicles (AUVs) in such applications as long-range oceanographic survey, autonomous docking, and shallow-water mine countermeasures requires improving the ...
Prestero, Timothy (Timothy Jason), 1970-
Autonomous underwater data muling using wireless optical communication and agile AUV control
Underwater exploration and surveillance currently relies on subsea cables and tethers to relay data back to the user. The cause for this is that water heavily absorbs most electromagnetic signals, preventing effective radio ...
Bearings-only tracking automation for a single unmanned underwater vehicle
Unmanned underwater vehicles have various missions within civilian, military and academic sectors. They have the ability to explore areas unavailable to manned assets and to perform duties that are risky to humans. In ...
Middlebrook, Danica Lee
Rex 2 : design, construction, and operation of an unmanned underwater vehicle
The practical usage of unmanned underwater vehicles (UUVs) is limited by vehicle and operation cost, difficulty in accurate navigation, and communication between the vehicle and operator. The "Rex 2" UUV employs a system ...
Owens, Dylan
Aquatecture : underwater dwellings and sea born structures as paradigms of design
There are many reasons for undertaking a work such as this. Among them are the benefits offered to society when we acknowledge the potential of submersible structures, The provision of habitable underwater space remains ...
Guillermo, Ricardo
Conceptual design of a thrust-vectoring tailcone for underwater robotics
Thrust-vectoring on Autonomous Underwater Vehicles is an appealing directional-control solution because it improves turning radius capabilities. Unfortunately, thrust-vectoring requires the entire propulsion system be ...
Nawrot, Michael T
The creation of fiberglass tanks and parts for autonomous underwater vehicle constant buoyancy power supply
The purpose of this thesis was to construct and seal air and containment tanks and other parts for a constant buoyancy power supply for an Autonomous Underwater Vehicle, or AUV. While multiple materials and techniques were ...
Sack, Jean H. (Jean Hope)
13.49 Maneuvering and Control of Surface and Underwater Vehicles, Fall 2004
Maneuvering motions of surface and underwater vehicles. Derivation of equations of motion, hydrodynamic coefficients. Memory effects. Linear and nonlinear forms of the equations of motion. Control surfaces modeling and ...
Triantafyllou, Michael S.
Integrated perception, modeling, and control paradigm for bistatic sonar tracking by autonomous underwater vehicles
In this thesis, a fully autonomous and persistent bistatic anti-submarine warfare (ASW) surveillance solution is developed using the autonomous underwater vehicles (AUVs). The passive receivers are carried by these AUVs, ...
Lum, Raymond Hon Kit
Oil/gas collector/separator for underwater oil leaks
An oil/gas collector/separator for recovery of oil leaking, for example, from an offshore or underwater oil well. The separator is floated over the point of the leak and tethered in place so as to receive oil/gas floating, or forced under pressure, toward the water surface from either a broken or leaking oil well casing, line, or sunken ship. The separator is provided with a downwardly extending skirt to contain the oil/gas which floats or is forced upward into a dome wherein the gas is separated from the oil/water, with the gas being flared (burned) at the top of the dome, and the oil is separated from water and pumped to a point of use. Since the density of oil is less than that of water it can be easily separated from any water entering the dome.
Henning, Carl D. (Livermore, CA)
AUV technology heads for new depths[Autonomous Underwater Vehicle
High-tech unmanned submarine technologies initially developed by the US Navy are being adapted for a new role to assist the oil and gas industry's shift into deeper waters. To address the problem of costly data acquisition and inaccurate survey data, C and C Technologies of Lafayette, La., has hired Kongsberg Simrad to construct the Hugin 3000 deepwater autonomous underwater vehicle (AUV). As the technology is applied to energy exploration and production advances to meet the deepwater challenges beyond the continental shelf, AUVs will be increasingly employed, it is believed. The paper describes the Hugin project, unexpected situations, the vehicle position tracking system, vehicle operation and real-time data quality control, real-time data monitoring and control, Hugin field experience, and pipe route surveying.
Hayes, D.
CPP-603 Underwater Fuel Storage Facility Site Integrated Stabilization Management Plan (SISMP), Volume I
The CPP-603 Underwater Fuel Storage Facility (UFSF) Site Integrated Stabilization Management Plan (SISMP) has been constructed to describe the activities required for the relocation of spent nuclear fuel (SNF) from the CPP-603 facility. These activities are the only Idaho National Engineering Laboratory (INEL) actions identified in the Implementation Plan developed to meet the requirements of the Defense Nuclear Facilities Safety Board (DNFSB) Recommendation 94-1 to the Secretary of Energy regarding an improved schedule for remediation in the Defense Nuclear Facilities Complex. As described in the DNFSB Recommendation 94-1 Implementation Plan, issued February 28, 1995, an INEL Spent Nuclear Fuel Management Plan is currently under development to direct the placement of SNF currently in existing INEL facilities into interim storage, and to address the coordination of intrasite SNF movements with new receipts and intersite transfers that were identified in the DOE SNF Programmatic and INEL Environmental Restoration and Waste Management Environmental Impact Statement Record, of Decision. This SISMP will be a subset of the INEL Spent Nuclear Fuel Management Plan and the activities described are being coordinated with other INEL SNF management activities. The CPP-603 relocation activities have been assigned a high priority so that established milestones will be meet, but there will be some cases where other activities will take precedence in utilization of available resources. The Draft INEL Site Integrated Stabilization Management Plan (SISMP), INEL-94/0279, Draft Rev. 2, dated March 10, 1995, is being superseded by the INEL Spent Nuclear Fuel Management Plan and this CPP-603 specific SISMP.
Denney, R.D.
Design and analysis of an Extended Kalman Filter based navigator for an autonomous underwater vehicle
DESIGN AND ANALYSIS OF AN EXTENDED KALMAN FILTER BASED NAVIGATOR FOR AN AUTONOMOUS UNDERWATER VEHICLE A Thesis by BRADLEY EUGENE JUST Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE May 1994 Major Subject: Mechanical Engineering DESIGN AND ANALYSIS OF AN EXTENDED KALMAN FILTER BASED NAVIGATOR FOR AN AUTONOMOUS UNDERWATER VEHICLE A Thesis by BRADLEY EUGENE JUST Submitted to Texas A...
Just, Bradley Eugene
Acoustic metafluids Andrew N. Norrisa
of material that surrounds the object to be rendered acoustically "invisible." Stealth can also be achieved of material necessary to achieve stealth. We define these materials as acoustic metafluids, which as we are materials with anisotropic inertia and the elastic properties of what are known as pentamode materials
Norris, Andrew
The electron geodesic acoustic mode
In this report, a novel new mode, named the electron geodesic acoustic mode, is presented. This mode can occur in toroidal plasmas like the conventional geodesic acoustic mode (GAM). The frequency of this new mode is much larger than that of the conventional GAM by a factor equal to the square root of the ion to electron mass ratio.
Chakrabarti, N. [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta 700 064 (India); Guzdar, P. N. [Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742 (United States); Kaw, P. K. [Institute for Plasma Research Bhat, Gandhinagar 382428 (India)
Opto-acoustic thrombolysis
This invention is a catheter-based device for generating an ultrasound excitation in biological tissue. Pulsed laser light is guided through an optical fiber to provide the energy for producing the acoustic vibrations. The optical energy is deposited in a water-based absorbing fluid, e.g. saline, thrombolytic agent, blood or thrombus, and generates an acoustic impulse in the fluid through thermoelastic and/or thermodynamic mechanisms. By pulsing the laser at a repetition rate (which may vary from 10 Hz to 100 kHz) an ultrasonic radiation field can be established locally in the medium. This method of producing ultrasonic vibrations can be used in vivo for the treatment of stroke-related conditions in humans, particularly for dissolving thrombus or treating vasospasm. The catheter can also incorporate thrombolytic drug treatments as an adjunct therapy and it can be operated in conjunction with ultrasonic detection equipment for imaging and feedback control and with optical sensors for characterization of thrombus type and consistency.
Celliers, Peter (Berkeley, CA); Da Silva, Luiz (Danville, CA); Glinsky, Michael (Livermore, CA); London, Richard (Orinda, CA); Maitland, Duncan (Livermore, CA); Matthews, Dennis (Moss Beach, CA); Fitch, Pat (Livermore, CA)
Acoustic Characterization of Mesoscale Objects
This report describes the science and engineering performed to provide state-of-the-art acoustic capabilities for nondestructively characterizing mesoscale (millimeter-sized) objects--allowing micrometer resolution over the objects entire volume. Materials and structures used in mesoscale objects necessitate the use of (1) GHz acoustic frequencies and (2) non-contacting laser generation and detection of acoustic waves. This effort demonstrated that acoustic methods at gigahertz frequencies have the necessary penetration depth and spatial resolution to effectively detect density discontinuities, gaps, and delaminations. A prototype laser-based ultrasonic system was designed and built. The system uses a micro-chip laser for excitation of broadband ultrasonic waves with frequency components reaching 1.0 GHz, and a path-stabilized Michelson interferometer for detection. The proof-of-concept for mesoscale characterization is demonstrated by imaging a micro-fabricated etched pattern in a 70 {micro}m thick silicon wafer.
Chinn, D; Huber, R; Chambers, D; Cole, G; Balogun, O; Spicer, J; Murray, T
Acoustically Enhanced Boiling Heat Transfer
An acoustic field is used to increase the critical heat flux (CHF) of a flat-boiling-heat-transfer surface. The increase is a result of the acoustic effects on the vapor bubbles. Experiments are performed to explore the effects of an acoustic field on vapor bubbles in the vicinity of a rigid-heated wall. Work includes the construction of a novel heater used to produce a single vapor bubble of a prescribed size and at a prescribed location on a flatboiling surface for better study of an individual vapor bubble's reaction to the acoustic field. Work also includes application of the results from the single-bubble heater to a calibrated-copper heater used for quantifying the improvements in CHF.
Z. W. Douglas; M. K. Smith; A. Glezer
Heading Lock Maneuver Testing of Autonomous Underwater Vehicle
In recent years, Autonomous Underwater Vehicle (UAV) research and development at Bandung Institute of Technology in Indonesia has achieved the testing stage in the field. This testing was still being classified as the early testing, since some of the preliminary tests were carried out in the scale of the laboratory. The paper would discuss the laboratory test and several tests that were done in the field. Discussions were stressed in the procedure and the aim that will be achieved, along with several early results. The testing was carried out in the lake with the area around 8300 Ha and the maximum depth of 50 meters. The location of the testing was chosen with consideration of minimizing the effect of the current and the wave, as well as the location that was not too far from the Laboratory. The type of testing that will be discussed in paper was Heading Lock Maneuver Testing. The vehicle was tested to move with a certain cruising speed, afterwards it was commanded by an arbitrarily selected heading directio...
Muljowidodo, K
Chapter I: Ecological Acoustics 1.1 Ecological Perception
23 Chapter I: Ecological Acoustics 1.1 Ecological Perception The ecological approach to perception of view of low-level sensory stimuli. #12;Ecological Perception 24 The ecological approach, however of its ecological activities, can be obtained by direct sensitivity to invariant structures in the world
Cummins, Fred
Tenth International Symposium on Unmanned Untethered Submersible Technology: Special Session on Bio-Engineering Research Related to Autonomous Underwater Vehicles. September 8 -11,
-Engineering Research Related to Autonomous Underwater Vehicles. September 8 - 11, 1997, New England Center, Univ of NH Abstract - Maneuverability is critical to the performance of autonomous underwater vehicles (AUV) and fast underwater vehicles (AUV) is the ability to maneuver or turn. Rapid turns with small radii while maintaining
Fish, Frank
International Journal of Systems Science, 1999, volume 30, number 9, pages 939 946 Global attitude/position regulation for underwater vehicles
controller is designed for a 6 DOF model of an unmanned underwater vehicle (UUV) which includes both/position regulation for underwater vehicles DEJAN M. BOS�KOVIC� � and MIROSLAV KRSTIC�� In this paper a nonlinear underwater vehicles (UUVs) is an area of growing interest due to their ability to operate at depths
Krstic, Miroslav
The Nereus Hybrid Underwater Robotic Vehicle for Global Ocean Science Operations to 11,000m Depth
is to provide the U.S. oceanographic community with the first capable and cost- effective vehicle for routineThe Nereus Hybrid Underwater Robotic Vehicle for Global Ocean Science Operations to 11,000m Depth-- This paper reports an overview of the new Nereus hybrid underwater vehicle and summarizes the vehicle's per
Assessing underwater noise levels during pile-driving at an offshore windfarm and its potential effects on marine mammals
of underwater noise on marine spe- cies, particularly from pile-driving for wind turbines. Environmental. In 2006, two 5 MW wind tur- bines were installed off NE Scotland. The turbines were in deep (>40 m) waterAssessing underwater noise levels during pile-driving at an offshore windfarm and its potential
Aberdeen, University of
A Self-triggered Visual Servoing Model Predictive Control Scheme for Under-actuated Underwater Robotic Vehicles
extensively used in the past for the autonomous operation of underwater robotic vehicles. Complex missions Robotic Vehicles Shahab Heshmati-Alamdari, Alina Eqtami, George C. Karras, Dimos V. Dimarogonas and Kostas Control (NMPC) scheme for an under- actuated underwater robotic vehicle. In this scheme, the control loop
Dimarogonas, Dimos
Reflective echo tomographic imaging using acoustic beams
An inspection system includes a plurality of acoustic beamformers, where each of the plurality of acoustic beamformers including a plurality of acoustic transmitter elements. The system also includes at least one controller configured for causing each of the plurality of acoustic beamformers to generate an acoustic beam directed to a point in a volume of interest during a first time. Based on a reflected wave intensity detected at a plurality of acoustic receiver elements, an image of the volume of interest can be generated.
Kisner, Roger; Santos-Villalobos, Hector J
Underwater temporary threshold shift induced by octave-band noise in three species of pinniped
especially sensitive to acoustic overstimulation, given increasing levels of oceanic noise pollution intensity and duration is sufficient to induce TTS under water in these pinniped species. © 1999 Acoustical inter- act in complicated ways with these acoustic characteristics. Studies of TTS in nonhumans have
Reichmuth, Colleen
Integrated treatment and handling of highly activated components from nuclear facilities
A complete Underwater Treatment System (UTS) is described for activated/contaminated components of various origins in the nuclear industry. The system comprises different kinds of cutting/compacting equipment: the USC (Underwater Shear/compactor), the SCS (Stellite Corner Shear), the VLS (Velocity Limiter Shear) and the LCS (Light Crusher Shear). Transfer and loading equipment, the STB (Shielded Transfer Bell) provides safe and economic loading of containers with cut components. Operating experience and performance data are presented.
Schneider, K.A.; Kiolbassa, A.; Rose, K.A. [NUKEM GmbH, Alzenau (Germany); Raymont, J.M. Jr. [WasteChem, Houston, TX (United States)
Spring 2011 ME706 Acoustics and Aerodynamic Sound ME706 Acoustics and Aerodynamic Sound
Spring 2011 ME706 Acoustics and Aerodynamic Sound ME706 Acoustics and Aerodynamic Sound Instructor-surface interaction. Spring 2011 1 ME706 Acoustics and Aerodynamic Sound #12;Spring 2011 ME706 Acoustics and Aerodynamic Sound Students are expected to: · Exhibit a level of mathematical maturity roughly equivalent
IN ACOUSTICS UndergraduateCourses2015
APPLYING SOUND KNOWLEDGE IN ACOUSTICS Acoustics UndergraduateCourses2015 #12;SOUTHA 2 #12;Reach-leadingacademicsoncoursesthataredesignedaroundyou. Wegetyoureadyfortheglobaljobsmarket,whilegivingyouagreat studentexperience. Acousticalcountriestoreducenoise REDUCING AIRCRAFT NOISE OurRollsRoyceUniversity TechnologyCentreforGas Turbine
Acoustic data transmission through a drill string
Acoustical signals are transmitted through a drill string by canceling upward moving acoustical noise and by preconditioning the data in recognition of the comb filter impedance characteristics of the drill string. 5 figs.
Acoustic signal estimation using multiple blind observations
This thesis proposes two algorithms for recovering an acoustic signal from multiple blind measurements made by sensors (microphones) over an acoustic channel. Unlike other algorithms that use a posteriori probabilistic ...
Lee, Joonsung
Study of the Acoustic Effects of Hydrokinetic Tidal Turbines in Admiralty Inlet, Puget Sound
Hydrokinetic turbines will be a source of noise in the marine environment - both during operation and during installation/removal. High intensity sound can cause injury or behavioral changes in marine mammals and may also affect fish and invertebrates. These noise effects are, however, highly dependent on the individual marine animals; the intensity, frequency, and duration of the sound; and context in which the sound is received. In other words, production of sound is a necessary, but not sufficient, condition for an environmental impact. At a workshop on the environmental effects of tidal energy development, experts identified sound produced by turbines as an area of potentially significant impact, but also high uncertainty. The overall objectives of this project are to improve our understanding of the potential acoustic effects of tidal turbines by: (1) Characterizing sources of existing underwater noise; (2) Assessing the effectiveness of monitoring technologies to characterize underwater noise and marine mammal responsiveness to noise; (3) Evaluating the sound profile of an operating tidal turbine; and (4) Studying the effect of turbine sound on surrogate species in a laboratory environment. This study focuses on a specific case study for tidal energy development in Admiralty Inlet, Puget Sound, Washington (USA), but the methodologies and results are applicable to other turbine technologies and geographic locations. The project succeeded in achieving the above objectives and, in doing so, substantially contributed to the body of knowledge around the acoustic effects of tidal energy development in several ways: (1) Through collection of data from Admiralty Inlet, established the sources of sound generated by strong currents (mobilizations of sediment and gravel) and determined that low-frequency sound recorded during periods of strong currents is non-propagating pseudo-sound. This helped to advance the debate within the marine and hydrokinetics acoustic community as to whether strong currents produce propagating sound. (2) Analyzed data collected from a tidal turbine operating at the European Marine Energy Center to develop a profile of turbine sound and developed a framework to evaluate the acoustic effects of deploying similar devices in other locations. This framework has been applied to Public Utility District No. 1 of Snohomish Country's demonstration project in Admiralty Inlet to inform postinstallation acoustic and marine mammal monitoring plans. (3) Demonstrated passive acoustic techniques to characterize the ambient noise environment at tidal energy sites (fixed, long-term observations recommended) and characterize the sound from anthropogenic sources (drifting, short-term observations recommended). (4) Demonstrated the utility and limitations of instrumentation, including bottom mounted instrumentation packages, infrared cameras, and vessel monitoring systems. In doing so, also demonstrated how this type of comprehensive information is needed to interpret observations from each instrument (e.g., hydrophone data can be combined with vessel tracking data to evaluate the contribution of vessel sound to ambient noise). (5) Conducted a study that suggests harbor porpoise in Admiralty Inlet may be habituated to high levels of ambient noise due to omnipresent vessel traffic. The inability to detect behavioral changes associated with a high intensity source of opportunity (passenger ferry) has informed the approach for post-installation marine mammal monitoring. (6) Conducted laboratory exposure experiments of juvenile Chinook salmon and showed that exposure to a worse than worst case acoustic dose of turbine sound does not result in changes to hearing thresholds or biologically significant tissue damage. Collectively, this means that Chinook salmon may be at a relatively low risk of injury from sound produced by tidal turbines located in or near their migration path. In achieving these accomplishments, the project has significantly advanced the District's goals of developing a demonstration-scale tidal energy proj
Brian Polagye; Jim Thomson; Chris Bassett; Jason Wood; Dom Tollit; Robert Cavagnaro; Andrea Copping
Particle analysis in an acoustic cytometer
The present invention is a method and apparatus for acoustically manipulating one or more particles. Acoustically manipulated particles may be separated by size. The particles may be flowed in a flow stream and acoustic radiation pressure, which may be radial, may be applied to the flow stream. This application of acoustic radiation pressure may separate the particles. In one embodiment, the particles may be separated by size, and as a further example, the larger particles may be transported to a central axis.
Kaduchak, Gregory; Ward, Michael D
Gas sensing with acoustic devices
A survey is made of acoustic devices that are suitable as gas and vapor sensors. This survey focuses on attributes such as operating frequency, mass sensitivity, quality factor (Q), and their ability to be fabricated on a semiconductor substrate to allow integration with electronic circuitry. The treatment of the device surface with chemically-sensitive films to detect species of interest is discussed. Strategies for improving discrimination are described, including sensor arrays and species concentration and separation schemes. The advantages and disadvantages of integrating sensors with microelectronics are considered, along with the effect on sensitivity of scaling acoustic gas sensors to smaller size.
Martin, S.J.; Frye, G.C. [Sandia National Labs., Albuquerque, NM (United States); Spates, J.J. [Ktech Corp., Albuquerque, NM (United States); Butler, M.A. [Sandia National Labs., Albuquerque, NM (United States)
Underwater Bomb Trajectory Prediction for Stand-off Assault (Mine/IED) Breaching Weapon
Underwater Bomb Trajectory Prediction for Stand-off Assault (Mine/IED) Breaching Weapon Fuse To support the development and evaluation of the Stand-off Assault Breaching Weapon Fuse Improvement (SOABWFI for developing an effective system for use against IEDs and mines. The Joint Direct Attack Munition (JDAM
Chu, Peter C.
Estimation of Relative Position and Coordination of Mobile Underwater Robotic Platforms through Electric Sensing
Electric Sensing Yannick Morel, Mathieu Porez, and Auke J. Ijspeert Abstract-- In the context of underwater this issue, we propose the use of electric sensing, with a technique inspired by weakly electric fishes. In particular, the approach relies on one or several of the agents applying an electric field
Impact of underwater-ice evolution on Arctic summer sea ice
Impact of underwater-ice evolution on Arctic summer sea ice Dirk Notz,1,4 Miles G. McPhee,2 M. Grae the simultaneous growth and ablation of a layer of ice between an under-ice melt pond and the underlying ocean. Such ``false bottoms'' are the only significant source of ice formation in the Arctic during summer. Analytical
Worster, M. Grae
Control Synthesis and Adaptation for an Underactuated Autonomous Underwater Vehicle 1
adaptation to changes in control authority. Our framework is a motion control system architecture which, the first a yaw maneuver of an AUV using only roll and pitch actuation, and the second a ``parking maneuver'' for an AUV. Experimental results for the yaw maneuver example are described. Keywords: Autonomous Underwater
Large area 3D reconstructions from underwater Oscar Pizarro, Ryan Eustice and Hanumant Singh
and validated system for processing optical images acquired from an underwater robotic vehicle to form a 3D of processing is a bundle adjustment that provides the 3D structure, camera poses and uncertainty estimates a robotic vehicle or towed sled. Such surveys are required to study hydrothermal vents and spreading ridges
SemiAutonomous Teleoperation of a Non-Holonomic Underwater Vehicle Using a Laser
the field of view has been examined in the past, in robotic manipulators [7], cartesian robots [8 describes a switching visual servoing control scheme designed for an underwater vehicle with non- holonomic controller design, the resulting controller has analytically guaranteed stability and convergence properties
Loizou, Savvas G.
International Conference on Microwave and High Frequency Heating Nottingham, UK, September 2013 Underwater Microwave Ignition of
-cost operation [4, 5]. Thermite reaction as a self-propagated, high-temperature synthesis (SHS) process, Localized microwave heating, underwater ignition, combustion. INTRODUCTION Self-propagated thermite reactions between metal-oxide and metals typically burn at high flame temperatures, and require high
Jerby, Eli
Results of the first two seasons of underwater surveys at Episkopi Bay and Akrotiri, Cyprus
During the summers of 2003 and 2004, a small team of graduate students initiated an underwater archaeological survey off the coast of Cyprus as part of the University of Cincinnati excavations at Episkopi-Bamboula. With the support of the Institute...
Leidwanger, Justin Ryan
Abstract-Homing and navigation capabilities are essential for many Autonomous Underwater Vehicle
Abstract- Homing and navigation capabilities are essential for many Autonomous Underwater Vehicle's position in the vehicle frame. In order to triangulate his position, the AUV need to maneuver while an initial estimate of the vehicle's location with respect to a fixed or moving beacon. These initials
AC 2007-2003: UNDERWATER LEGO ROBOTICS: TESTING, EVALUATION & Adam Carberry, Tufts University
AC 2007-2003: UNDERWATER LEGO ROBOTICS: TESTING, EVALUATION & REDESIGN Adam Carberry, Tufts from Tufts. He is also a research assistant at the Tufts University Center for Engineering Educational a difference in bringing engineering to K-12 education. He is also a research assistant at the Tufts University
Understanding fish behavior during typhoon events in real-life underwater environments
Understanding fish behavior during typhoon events in real-life underwater environments Concetto · Fang-Pang Lin · Daniela Giordano · Lynda Hardman · Robert B. Fisher Abstract The study of fish inevitably influenced the behavior of the fish under observation. Recent projects involving the installation
One Fish, Two Fish, Butterfish, Trumpeter: Recognizing Fish in Underwater Video
One Fish, Two Fish, Butterfish, Trumpeter: Recognizing Fish in Underwater Video Andrew Rova Simon template object recognition method for classifying fish species in un- derwater video. This method can be a component of a system that automatically identifies fish by species, im- proving upon previous works which
Mori, Greg
Long-term underwater camera surveillance for monitoring and analysis of fish populations
Long-term underwater camera surveillance for monitoring and analysis of fish populations Bastiaan J software to detect and recognise fish species. This footage is processed on supercomput- ers, which allow using a web-interface that allows them to display counts of fish species in the camera footage. 1
Trajectory-aware Communication Solution for Underwater Gliders using WHOI Micro-Modems
routing protocol is combined with practical cross-layer optimization to minimize energy consumption. Our collection, disaster preven- tion, and navigation. Autonomous Underwater Vehicles (AUVs) equipped protocol is designed to send packets to a region rather than to a point. To improve the network's energy
Design and Implementation of Time Efficient Trajectories for an Underwater Vehicle
: Autonomous Underwater Vehicles, Optimal Control, Numerical Algorithm, Trajectory Planning. 1 Introduction- trol strategies that govern their motions. Traditionally, autonomous underwa- ter vehicles (AUV's) have. This is a first step toward minimizing a combination of both time and energy consumption along a given trajectory
Implementable Efficient Time and Energy Consumption Trajectories Design For an Autonomous Underwater Vehicle
Implementable Efficient Time and Energy Consumption Trajectories Design For an Autonomous efficient trajectories onto a test-bed autonomous underwater vehicle. The trajectories are losely connected, their autonomy has become a large research interest. Much research has gone into making autonomous vehicles
Department of Mechanical Engineering Fall 2012 Unmanned Underwater Vehicle Test Tank and Obstacle Course
PENNSTATE Department of Mechanical Engineering Fall 2012 Unmanned Underwater Vehicle Test Tank and Obstacle Course Overview The purpose of this project is to design and build a test tank to showcase multiple UUVs in a competition. The tank will be vital in demonstrating the abilities of the UUVs
1-4244-2575-4/08/$20.00 c 2008 IEEE A Cross-layer Communication Solution for Multimedia Applications
, pollution moni- toring, offshore exploration, and assisted navigation. Wire- less acoustic communications Applications in Underwater Acoustic Sensor Networks Dario Pompili Rutgers, The State University of New Jersey Underwater multimedia acoustic sensor networks will enable new underwater applications such as multimedia
Opto-acoustic transducer for medical applications
This invention is an optically activated transducer for generating acoustic vibrations in a biological medium. The transducer is located at the end of a fiber optic which may be located within a catheter. Energy for operating the transducer is provided optically by laser light transmitted through the fiber optic to the transducer. Pulsed laser light is absorbed in the working fluid of the transducer to generate a thermal pressure and consequent adiabatic expansion of the transducer head such that it does work against the ambient medium. The transducer returns to its original state by a process of thermal cooling. The motion of the transducer within the ambient medium couples acoustic energy into the medium. By pulsing the laser at a high repetition rate (which may vary from CW to 100 kHz) an ultrasonic radiation field can be established locally in the medium. This method of producing ultrasonic vibrations can be used in vivo for the treatment of stroke-related conditions in humans, particularly for dissolving thrombus. The catheter may also incorporate anti-thrombolytic drug treatments as an adjunct therapy and it may be operated in conjunction with ultrasonic detection equipment for imaging and feedback control.
Benett, William (Livermore, CA); Celliers, Peter (Berkeley, CA); Da Silva, Luiz (Danville, CA); Glinsky, Michael (Livermore, CA); London, Richard (Orinda, CA); Maitland, Duncan (Livermore, CA); Matthews, Dennis (Moss Beach, CA); Krulevich, Peter (Pleasanton, CA); Lee, Abraham (Walnut Creek, CA)
This invention is an optically activated transducer for generating acoustic vibrations in a biological medium. The transducer is located at the end of a fiber optic which may be located within a catheter. Energy for operating the transducer is provided optically by laser light transmitted through the fiber optic to the transducer. Pulsed laser light is absorbed in the working fluid of the transducer to generate a thermal pressure and consequent adiabatic expansion of the transducer head such that it does work against the ambient medium. The transducer returns to its original state by a process of thermal cooling. The motion of the transducer within the ambient medium couples acoustic energy into the medium. By pulsing the laser at a high repetition rate (which may vary from CW to 100 kHz) an ultrasonic radiation field can be established locally in the medium. This method of producing ultrasonic vibrations can be used in vivo for the treatment of stroke-related conditions in humans, particularly for dissolving thrombus. The catheter may also incorporate anti-thrombolytic drug treatments as an adjunct therapy and it may be operated in conjunction with ultrasonic detection equipment for imaging and feedback control. 7 figs.
Benett, W.; Celliers, P.; Da Silva, L.; Glinsky, M.; London, R.; Maitland, D.; Matthews, D.; Krulevich, P.; Lee, A.
This paper discusses selecting and Implementing hydrolasing technology to reduce radioactive contamination in preparing to dispose of the K Basins; two highly contaminated concrete basins at the Hanford Site. A large collection of spent nuclear fuel stored for many years underwater at the K Basins has been removed to stable, dry, safe storage. Remediation activities have begun for the remaining highly contaminated water, sludge, and concrete basin structures. Hydrolasing will be used to decontaminate and prepare the basin structures for disposal. The U. S. Department of Energy's (DOE) Hanford Site is considered the world's largest environmental cleanup project. The site covers 1,517 Km{sup 2} (586 square miles) along the Columbia River in an arid region of the northwest United States (U.S.). Hanford is the largest of the US former nuclear defense production sites. From the World War II era of the mid-1940s until the late-1980s when production stopped, Hanford produced 60 percent of the plutonium for nuclear defense and, as a consequence, produced a significant amount of environmental pollution now being addressed. Spent nuclear fuel was among the major challenges for DOE's environmental cleanup mission at Hanford. The end of production left Hanford with about 105,000 irradiated, solid uranium metal fuel assemblies--representing approximately 2,100 metric tons (80 percent of DOE's spent nuclear fuel). The fuel was ultimately stored in the K Basins water-filled, concrete basins attached to Hanford's K East (KE) and K West (KW) reactors. K Basin's fuel accounted for 95 percent of the total radioactivity in Hanford's former reactor production areas. Located about 457 meters (500 yards) from the Columbia River, the K Basins are two indoor, rectangular structures of reinforced concrete; each filled with more than 3.8 million liters (one million gallons) of water that has become highly contaminated with long-lived radionuclides. At the KW Basin, fuel was packaged and sealed in canisters. At the KE Basin, fuel was stored in open canisters that were exposed to water in the basin. The irradiated spent nuclear fuel corroded during long-term, wet storage; resulting in thousands of fuel assemblies becoming severely corroded and/or damaged. Corrosion, especially in the KE Basin, contributed to the formation of a layer of radioactive sludge in the basins. Sludge removal is now progressing and will be followed by dewatering and dispositioning the concrete structures. The DOE Richland Operations Office (RL) has given Fluor Hanford Inc./Fluor Government Group (Fluor) the task of preparing Hanford's K Basins for decontamination and disposal. Prior to dewatering, hydrolasing will be used to decontaminate the basin surfaces to prepare them for disposal. By removing highly contaminated surface layers of concrete, hydrolasing will be used to meet the dose objectives for protecting workers and complying with regulations for transporting demolition debris. Fluor has innovated, tested, and planned the application of the hydrolasing technology to meet the challenge of decontaminating highly radioactive concrete surfaces underwater. Newly existing technology is being adapted to this unique challenge.
Keyboard Acoustic Emanations Scott Leishman
of this step is the matrix. After that, the Viterbi algorithm [11] is used to infer qi, i.e. the best sequenceKeyboard Acoustic Emanations Scott Leishman ML Tea Talk - May 3rd, 2006 1 (or why you shouldn
Roweis, Sam
E-Print Network 3.0 - acoustic oscillation signature Sample Search...
47 ACOUSTICAL EFFECTS OF INTERNAL TIDES ACOUSTICAL EFFECTS OF INTERNAL TIDES ON SHALLOW WATER Summary: ACOUSTICAL EFFECTS OF INTERNAL TIDES ACOUSTICAL EFFECTS OF INTERNAL TIDES...
Nonlinear dust acoustic waves and shocks
We describe experiments on (1) nonlinear dust acoustic waves and (2) dust acoustic shocks performed in a direct current (DC) glow discharge dusty plasma. First, we describe experiments showing nonlinear dust acoustic waves characterized by waveforms of the dust density that are typically sharper in the wave crests and flatter in the wave troughs (compared to sinusoidal waves), indicating the development of wave harmonics. We discuss this behavior in terms of a second-order fluid theory for dust acoustic waves. Second, experimental observations of the propagation and steepening of large-amplitude dust acoustic waves into dust acoustic shock waves are presented. The observed shock wave evolution is compared with numerical calculations based on the Riemann solution of the fully nonlinear fluid equations for dust acoustic waves.
Merlino, R. L.; Heinrich, J. R.; Hyun, S.-H.; Meyer, J. K. [Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242 (United States)
Lossy compression and real-time geovisualization for ultra-low bandwidth telemetry from untethered underwater vehicles
Oceanographic applications of robotics are as varied as the undersea environment itself. As underwater robotics moves toward the study of dynamic processes with multiple vehicles, there is an increasing need to distill ...
Murphy, Christopher Alden
Design of an autonomous underwater vehicle to evaluate the blazed array sonar and simultaneous localization and mapping algorithms
This thesis has investigated aspects of the design of a new highly maneuverable Autonomous Underwater Vehicle - the XAUV. The overall goal for the design of this vehicle is to create a small, highly maneuverable AUV that ...
Uhle, Matthew William
Surface acoustic wave probe implant for predicting epileptic seizures
A system and method for predicting and avoiding a seizure in a patient. The system and method includes use of an implanted surface acoustic wave probe and coupled RF antenna to monitor temperature of the patient's brain, critical changes in the temperature characteristic of a precursor to the seizure. The system can activate an implanted cooling unit which can avoid or minimize a seizure in the patient.
Gopalsami, Nachappa (Naperville, IL); Kulikov, Stanislav (Sarov, RU); Osorio, Ivan (Leawood, KS); Raptis, Apostolos C. (Downers Grove, IL)
Acoustic emission monitoring for assessment of steel bridge details
Acoustic emission (AE) testing was deployed on details of two large steel Interstate Highway bridges: one cantilever through-truss and one trapezoidal box girder bridge. Quantitative measurements of activity levels at known and suspected crack locations were made by monitoring AE under normal service loads (e.g., live traffic and wind). AE indications were used to direct application of radiography, resulting in identification of a previously unknown flaw, and to inform selection of a retrofit detail.
Kosnik, D. E.; Corr, D. J. [Infrastructure Technology Institute, Northwestern University, Evanston, IL 60208 (United States); Hopwood, T. [Kentucky Transportation Center, University of Kentucky, Lexington, KY 40506 (United States)
Cylindrical acoustic levitator/concentrator
A low-power, inexpensive acoustic apparatus for levitation and/or concentration of aerosols and small liquid/solid samples having particulates up to several millimeters in diameter in air or other fluids is described. It is constructed from a commercially available, hollow cylindrical piezoelectric crystal which has been modified to tune the resonance frequency of the breathing mode resonance of the crystal to that of the interior cavity of the cylinder. When the resonance frequency of the interior cylindrical cavity is matched to the breathing mode resonance of the cylindrical piezoelectric transducer, the acoustic efficiency for establishing a standing wave pattern in the cavity is high. The cylinder does not require accurate alignment of a resonant cavity. Water droplets having diameters greater than 1 mm have been levitated against the force of gravity using; less than 1 W of input electrical power. Concentration of aerosol particles in air is also demonstrated.
Kaduchak, Gregory (Los Alamos, NM); Sinha, Dipen N. (Los Alamos, NM)
Acoustic horizons in nuclear fluids
We consider a hydrodynamic description of the spherically symmetric outward flow of nuclear matter, accommodating dispersion in it as a very weak effect. About the resulting stationary conditions in the flow, we apply an Eulerian scheme to derive a fully nonlinear equation of a time-dependent radial perturbation. In its linearized limit, with no dispersion, this equation implies the static acoustic horizon of an analogue gravity model. We, however, show that time-dependent nonlinear effects destabilize the static horizon. We also model the perturbation as a high-frequency travelling wave, and perform a {\\it WKB} analysis, in which the effect of weak dispersion is studied iteratively. We show that even arbitrarily small values of dispersion make the horizon fully opaque to any acoustic disturbance propagating against the bulk flow, with the amplitude and the energy flux of the radial perturbation undergoing a discontinuity at the horizon, and decaying exponentially just outside it.
Niladri Sarkar; Abhik Basu; Jayanta K. Bhattacharjee; Arnab K. Ray
Acoustic characteristics of English fricatives
of noise spectrum, while there are some data suggesting that /f,v/ may be distin- guished from /Y,Z/ on the basis of transition information.a!Electronic mail: email@example.com 1252 1252J. Acoust. Soc. Am. 108 (3), Pt. 1, Sep 2000 0001...! Variance ~MHz! Skewness Kurtosis /f,v/ 5108 6.37 0.077 2.11 /T,D/ 5137 6.19 20.083 1.27 /s,z/ 6133 2.92 20.229 2.36 /S,Z/ 4229 3.38 0.693 0.421257 J. Acoust. Soc. Am., Vol. 108, No. 3, Pt. 1, Sep 2000with h2 ranging from 0.001 for skewness to 0.004 for spec...
Jongman, Allard; Wayland, Ratree; Wong, Serena
Vertical axis wind turbine acoustics
Vertical Axis Wind Turbine Acoustics Charlie Pearson Corpus Christi College Cambridge University Engineering Department A thesis submitted for the degree of Doctor of Philosophy September 2013 Declaration Described in this dissertation is work... quickly to changing wind conditions, small- scale vertical axis wind turbines (VAWTs) have been proposed as an efficient solution for deployment in built up areas, where the wind is more gusty in nature. If VAWTs are erected in built up areas...
Pearson, Charlie
Frustrated total internal reflection acoustic field sensor
A frustrated total internal reflection acoustic field sensor which allows the acquisition of the acoustic field over an entire plane, all at once. The sensor finds use in acoustic holography and acoustic diffraction tomography. For example, the sensor may be produced by a transparent plate with transparent support members tall enough to support one or more flexible membranes at an appropriate height for frustrated total internal reflection to occur. An acoustic wave causes the membrane to deflect away from its quiescent position and thus changes the amount of light that tunnels through the gap formed by the support members and into the membrane, and so changes the amount of light reflected by the membrane. The sensor(s) is illuminated by a uniform tight field, and the reflection from the sensor yields acoustic wave amplitude and phase information which can be picked up electronically or otherwise.
Kallman, Jeffrey S. (Pleasanton, CA)
Acoustic resonance frequency locked photoacoustic spectrometer
A photoacoustic spectroscopy method and apparatus for maintaining an acoustic source frequency on a sample cell resonance frequency comprising: providing an acoustic source to the sample cell, the acoustic source having a source frequency; repeatedly and continuously sweeping the source frequency across the resonance frequency at a sweep rate; and employing an odd-harmonic of the source frequency sweep rate to maintain the source frequency sweep centered on the resonance frequency.
Pilgrim, Jeffrey S.; Bomse, David S.; Silver, Joel A.
Acoustic resonance phase locked photoacoustic spectrometer
A photoacoustic spectroscopy method and apparatus for maintaining an acoustic source frequency on a sample cell resonance frequency comprising: providing an acoustic source to the sample cell to generate a photoacoustic signal, the acoustic source having a source frequency; continuously measuring detection phase of the photoacoustic signal with respect to source frequency or a harmonic thereof; and employing the measured detection phase to provide magnitude and direction for correcting the source frequency to the resonance frequency.
Admixture enhanced controlled low-strength material for direct underwater injection with minimal cross-contamination
Commercially available admixtures have been developed for placing traditional concrete products under water. This paper evaluates adapting anti-washout admixture (AWA) and high range water reducing admixture (HRWRA) products to enhance controlled low-strength materials (CLSMs) for underwater placement. A simple experimental scale model (based on dynamic and geometric similitude) of typical grout pump emplacement equipment has been developed to determine the percentage of cementing material washed out. The objective of this study was to identify proportions of admixtures and underwater CLSM emplacement procedures which would minimize the cross-contamination of the displaced water while maintaining the advantages of CLSM. Since the displaced water from radioactively contaminated systems must be subsequently treated prior to release to the environment, the amount of cross-contamination is important for cases in which cementing material could form hard sludges in a water treatment facility and contaminate the in-place CLSM stabilization medium.
Hepworth, H.K.; Davidson, J.S.; Hooyman, J.L.
Spring 2014 ME 720 Acoustics II ENG ME 720 Acoustics II
in a first course in acoustics or fluid mechanics. Outline syllabus: Equations of motion; acoustics as a branch of fluid mechanics. Sound waves and sources of sound in one, two and three dimensions. Scattering-ended ducts; end-correction. Prerequisites: Some familiarity with fluid mechanics, acoustics or continuum
Lin, Xi
Acoustic resonance for nonmetallic mine detection
The feasibility of acoustic resonance for detection of plastic mines was investigated by researchers at the Oak Ridge National Laboratory`s Instrumentation and Controls Division under an internally funded program. The data reported in this paper suggest that acoustic resonance is not a practical method for mine detection. Representative small plastic anti-personnel mines were tested, and were found to not exhibit detectable acoustic resonances. Also, non-metal objects known to have strong acoustic resonances were tested with a variety of excitation techniques, and no practical non-contact method of exciting a consistently detectable resonance in a buried object was discovered. Some of the experimental data developed in this work may be useful to other researchers seeking a method to detect buried plastic mines. A number of excitation methods and their pitfalls are discussed. Excitation methods that were investigated include swept acoustic, chopped acoustic, wavelet acoustic, and mechanical shaking. Under very contrived conditions, a weak response that could be attributed to acoustic resonance was observed, but it does not appear to be practical as a mine detection feature. Transfer properties of soil were investigated. Impulse responses of several representative plastic mines were investigated. Acoustic leakage coupling, and its implications as a disruptive mechanism were investigated.
Kercel, S.W.
Wind Turbine Acoustic Noise A white paper
Wind Turbine Acoustic Noise A white paper Prepared by the Renewable Energy Research Laboratory...................................................................... 8 Sound from Wind Turbines .............................................................................................. 10 Sources of Wind Turbine Sound
Massachusetts at Amherst, University of
Calculation of safe parameters of air shock waves for underwater explosions
The paper proposes a functional relationship for the calculation of the pressure at an air shock-wave front in underwater explosions of plaster-blasting charges. The maximum permissible mass of the charge and safe distance for objects can be calculated for an assigned value of the critical pressure at the air shock-wave front. The authors also state that this work was conducted as there are practically no significant results of experimental or theoretical investigations of this problem.
Smolii, N.I.; Ganopol'skii, M.I.
A note on stability of nongeneric equilibria for an underwater vehicle
We study the Lyapunov stability of a family of nongeneric equilibria with spin for underwater vehicles with noncoincident centers. The nongeneric equilibria belong to singular symplectic leaves that are not characterized as a preimage o a regular value of the Casimir functions. We find an invariant submanifold such that the nongeneric equilibria belong to a preimage of a regular value that involves sub-Casimir functions. We obtain results for nonlinear stability on this invariant submanifold.
Petre Birtea; Dan Comanescu
The Impact of Civil Rights Legislation on Classroom Acoustics
................................................................................................... 2 Petition to the Access Board........................................................................................... 3 Case Study ? Classroom Acoustics in the Courtroom.................................................... 4 Others Impacted... by Classroom Acoustics ...................................................................... 6 Chapter Two: Addressing Poor Classroom Acoustics with ANSI S12.60-2002................ 8 Reverberation Control...
Teel, Jeffrey
Assessment of a multi-stage underwater vehicle concept using a fossil-fuel Stirling engine
The Stirling Engine because of its inherent closed-cycle operation can be readily modified to work in an airless environment even if the primary source of energy is a fossil fuel. Thus, Stirling engines are well suited for use in the underwater environment and have been operated successfully in manned military submarines since the early 1980s. In recent years fossil fueled Stirling systems have been also proposed for use in small unmanned underwater vehicles (UUVs). However, in this case the need to carry an onboard oxygen supply in a very confined space has presented a number of design difficulties. These are identified in the paper. However, if the oxidant supply to the engine is provided by the membrane extraction of dissolved oxygen from seawater and/or disposable fuel/oxidant pods are used then the UUV Stirling system becomes more attractive. If this latter concept is extended to include multi-stage vehicles then it can be shown that fossil fueled Stirlings could also be put to effective use in long range-long endurance underwater vehicular operations.
Reader, G.T.; Potter, I.J. [Univ. of Calgary, Alberta (Canada). Dept. of Mechanical Engineering
The United Stirling 4-95 and 4-275 Engines I underwater use
The United Stirling 4-95 and 4-275 well-known engines have been adapted to underwater operation. The 4-95 power module has an output of 20 kW /SUB e/ and 40 kW as heat. The standard 4-95 engine has been modified for a pressurized combustion. The combustion pressure mates with the surrounding water depth at current limits for operational offshore diving. Hence no energy consuming compression or any complex dissolving system for the exhaust gas is required. Increased diving depth can be reached through already established technology. Combustion gas recirculation is used as thermic ballast and for flame temperature control, when using pure oxygen. The 4-275 engine is currently subject to underwater modification utilizing the same technology. This energy module will have an output of 100 kW /SUB e/ and 200 kW as heat. The system will comprise a LOX-storage, thus providing extensive underwater air-independent endurance. Based upon extensive laboratory testing and demonstrations under submerged conditions, the system is now scheduled for field testing and commercial introduction.
Nilsson, H.
Energy Efficient Multi-Path Communication for Time-Critical Applications in Underwater Sensor Networks
Abstract Due to the long propagation delay and high error rate of acoustic channels, it is very challenging, such as oceanographic data collection, pollution monitoring, offshore exploration, disaster prevention, and tactical quick absorption in water, thus acoustic channels are usually employed. The propagation speed
Short Paper: Launching Denial-of-Service Jamming Attacks in Underwater Sensor Networks
are performed on existing commercial brand acoustic modems and an OFDM modem prototype. We show that UWSNs can, and chemical/pollution contaminations. These sensors have changed the way humans live and are becoming more characterized by their use of under- water acoustic channels since electromagnetic waves can- not propagate over
Improving the Robustness of Location-Based Routing for Underwater Sensor Networks
) to enable/enhance applications such as oceanographic data collection, pollution monitoring, offshore, due to water absorption, radio does not work well. Thus acoustic communication is usually employed signals, acoustic channels are fea- tured with low available bandwidth, very large propagation delay
CX-009160: Categorical Exclusion Determination
Broader source: Energy.gov [DOE]
Underwater Active Acoustic Monitoring Network for Marine and Hydrokinetic Energy Projects CX(s) Applied: B3.3 Date: 09/24/2012 Location(s): Maine Offices(s): Golden Field Office
acoustical testing laboratory: Topics by E-print Network
Computational Acoustics, Vol. 9, No. 3 (2001) 1215-1225 c IMACS AIRBORNE ACOUSTICS October 1999 Revised 16 April 2000 A recently developed theoretical model of the airborne...
acoustic desorption liad: Topics by E-print Network
coverage... Juwono, Tjipto 2013-01-01 18 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustic equipment: Topics by E-print Network
was to be Music 302 Maher, Robert C. 13 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
assisted acoustic focusing: Topics by E-print Network
and solved. A. G. Ramm 2008-05-16 28 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustic microscopy risswachstumsstudien: Topics by E-print Network
Zhang; Rong-Gen Cai 2004-11-18 8 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustic passive localization: Topics by E-print Network
inter-sensor propagation Boyer, Edmond 2 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustic chemometrics monitoring: Topics by E-print Network
Acoustic methods have impediments as well, of course, most notably 27 Acoustic daylight imaging via spectral factorization: Helioseismology and reservoir monitoring: The...
acoustic howling suppression: Topics by E-print Network
by the Leningrad unknown authors 15 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustics ultrasonic imaging: Topics by E-print Network
Junjie Gong; Fangfang Shi; Yijing Ke 2 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustic chemometric monitoring: Topics by E-print Network
acoustic noise: Topics by E-print Network
of anisotropy in oceanic ambient noise fields and its relevance to Acoustic Daylight imaging CiteSeer Summary: Acoustic Daylight is a new technique for creating pictorial...
acoustic 4f imaging: Topics by E-print Network
24 25 Next Page Last Page Topic Index 1 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustic neuroma mimicking: Topics by E-print Network
botnet owners have Stojmenovic, Ivan 12 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustic 3-d imaging: Topics by E-print Network
landmarks or com- plete Delson, Eric 20 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustic microscopy: Topics by E-print Network
acoustic neuroma surgery: Topics by E-print Network
by the Leningrad unknown authors 8 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustic trauma evokes: Topics by E-print Network
Course Requirements Lockery, Shawn 18 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
airborne acoustical noise: Topics by E-print Network
acoustic overstimulation modifies: Topics by E-print Network
synthesizer can Johnson, Michael T. 13 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustic neuroma treatment: Topics by E-print Network
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acoustic neuroma resection: Topics by E-print Network
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acoustic neurinoma removal: Topics by E-print Network
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acoustic dispersion over SAW wavelengths down to 200 nm, meaning the SAW propagation ... Siemens, Mark 44 Excitation of kinetic geodesic acoustic modes by drift waves in...
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Nassir Navab 6 ACOUSTIC IMPEDANCE INVERSION FOR STATIC AND DYNAMIC CHARACTERIZATION OF A CO2 EOR PROJECT, Fossil Fuels Websites Summary: ACOUSTIC IMPEDANCE INVERSION FOR STATIC...
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Helmholtz resonators Physics Websites Summary: Numerical modeling of nonlinear acoustic waves in a tube connected with Helmholtz resonators Bruno Acoustic wave propagation in a...
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acoustic band gaps: Topics by E-print Network
type of phononic crystals manufactured Institute of Physics. DOI: 10.10631.2167794 The propagation of acoustic waves in periodic composite Deymier, Pierre 2 Acoustic band gap...
Acoustic Logs | Open Energy Information
Open Energy Info (EERE)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublic Utilities Address: 160 East 300 SouthWaterBrasil Jump to: navigation, searchAcciona SAAclaraAcoustic Logs
Acoustical Communications for Wireless Downhole Telemetry Systems
on this testbed in order to characterize the channel behavior are explained as well. Moreover, the large scale statistics of the acoustic waves along the pipe string are described. Results of this work indicate that acoustic waves experience a frequency- dependent...
Farraj, Abdallah
Acoustically enhanced heat exchange and drying apparatus
A heat transfer drying apparatus includes an acoustically augmented heat transfer chamber for receiving material to be dried. The chamber includes a first heat transfer gas inlet, a second heat transfer gas inlet, a material inlet, and a gas outlet which also serves as a dried material and gas outlet. A non-pulsing first heat transfer gas source provides a first drying gas to the acoustically augmented heat transfer chamber through the first heat transfer gas inlet. A valveless, continuous second heat transfer gas source provides a second drying gas to the acoustically augmented heat transfer chamber through the second heat transfer gas inlet. The second drying gas also generates acoustic waves which bring about acoustical coupling with the gases in the acoustically augmented heat transfer chamber. The second drying gas itself oscillates at an acoustic frequency of approximately 180 Hz due to fluid mechanical motion in the gas. The oscillations of the second heat transfer gas coupled to the first heat transfer gas in the acoustically augmented heat transfer chamber enhance heat and mass transfer by convection within the chamber. 3 figs.
Bramlette, T.T.; Keller, J.O.
R. White, Comsol Acoustics Introduction, 2012
R. White, Comsol Acoustics Introduction, © 2012 Tutorial Created in Comsol 4.3 (2012) #12;R. White Variables space and time (x,y,z,t) Dependent Variables unknown field (such as u) #12;R. White, Comsol (such as u) #12;R. White, Comsol Acoustics Introduction, © 2012 Finite Element Analysis (FEA / FEM) 1
White, Robert D.
Characterization of acoustically forced swirl flame dynamics
of the flame to acoustic excitation is required. This study presents an analysis of phase-locked OH PLIF images of acoustically excited swirl flames, to identify the key controlling physical processes and qualitatively discuss, and whose relative significance depends upon forcing frequency, amplitude of excitation, and flame
Lieuwen, Timothy C.
Microfabricated bulk wave acoustic bandgap device
A microfabricated bulk wave acoustic bandgap device comprises a periodic two-dimensional array of scatterers embedded within the matrix material membrane, wherein the scatterer material has a density and/or elastic constant that is different than the matrix material and wherein the periodicity of the array causes destructive interference of the acoustic wave within an acoustic bandgap. The membrane can be suspended above a substrate by an air or vacuum gap to provide acoustic isolation from the substrate. The device can be fabricated using microelectromechanical systems (MEMS) technologies. Such microfabricated bulk wave phononic bandgap devices are useful for acoustic isolation in the ultrasonic, VHF, or UHF regime (i.e., frequencies of order 1 MHz to 10 GHz and higher, and lattice constants of order 100 .mu.m or less).
Olsson, Roy H.; El-Kady, Ihab F.; McCormick, Frederick; Fleming, James G.; Fleming leg, Carol
Olsson, Roy H. (Albuquerque, NM); El-Kady, Ihab F. (Albuquerque, NM); McCormick, Frederick (Albuquerque, NM); Fleming, James G. (Albuquerque, NM); Fleming, legal representative, Carol (Albuquerque, NM)
Active and Adaptive Dive Planning for Dense Bathymetric Mapping
capabilities of Autonomous Underwater Vehicles (AUVs) have en- abled their deployment in oceans, coastal and sensor views of robotic vehicles to maximize information gained while minimizing time and/or energy consumption. In addition to actively planning the vehicle's dives, we also explore the benefit of adaptive
Monitoring underwater explosions in the habitat of resident bottlenose dolphins
a profound shift in natural resource management. It empha- sizes human dependence on eco- systems, humility development, agriculture, ship- ping, fishing, aquaculture, tourism and rec- reation, and oil and gas extraction are among the human activities that affect marine eco- systems. Without comprehensive EBM
15 Acoustic Daylight Imaging in the Michael J. Buckingham
15 Acoustic Daylight Imaging in the Ocean Michael J. Buckingham Scripps Institution of Oceanography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418 15.4 Acoustic daylight images . . . . . . . . . . . . . . . . . . . . . . . . 420 15.5 Concluding. Sensors and Imaging ISBN 0123797713/$30.00 #12;416 15 Acoustic Daylight Imaging in the Ocean Acoustic
R. White, Comsol Acoustics Introduction, 2/25/08
R. White, Comsol Acoustics Introduction, 2/25/08 #12;R. White, Comsol Acoustics Introduction, 2,y,z,t) Dependent Variables unknown field (such as u) #12;R. White, Comsol Acoustics Introduction, 2/25/08 Finite space and time (x,y,z,t) Dependent Variables unknown field (such as u) #12;R. White, Comsol Acoustics
Dust-Acoustic Waves: Visible Sound Waves Robert L. Merlino
Dust-Acoustic Waves: Visible Sound Waves Robert L. Merlino Department of Physics and Astronomy with their announcement that: "We find that a new type of sound wave, namely, the dust-acoustic waves, can appear" [1 and experimental work on dust acoustic waves is given. The basic physics of the dust acoustic wave and some
Merlino, Robert L.
Project of the underwater system for chemical threat detection
In this article we describe a novel method for the detection of explosives and other hazardous substances in the marine environment using neutron activation. Unlike the other considered methods based on this technique we propose to use guides forneutron and gamma quanta which speeds up and simplifies identification. Moreover, it may provide a determination of the density distribution of a dangerous substance. First preliminary results of Monte Carlo simulations dedicated for design of a device exploiting this method are also presented.
Silarski, M; Moskal, P; Smolis, M; Tadeja, S
Correlation time of ocean ambient noise intensity in San Diego Bay and target recognition in acoustic daylight images
Intensity Data Chapter 3 Acoustic Daylight Image TargetC. L. Epifanio. Acoustic Daylight: Passive Acoustic ImagingRecognition in Acoustic Daylight Images A Thesis submitted
Wadsworth, Adam J.
Operational feasibility of underwater Stirling engine systems using oxygen-seawater extraction
The exploration of the oceans whether for societal, commercial, scientific or military reasons requires efficient and cost effective underwater vehicles. In turn, these vessels require efficient means of producing on board power for the propulsion and hotel load requirements of long endurance missions. The Stirling engine, because of its inherent closed-cycle operation, has long been an attractive candidate for underwater use and now has proved its reliability and maintainability in the arduous environment of a naval submarine application. More recently the Stirling has been considered for use in small long endurance unmanned underwater vessels (UUVs). However, with these type of vehicles the need to carry an on board oxygen supply in a very confined space has presented a number of design problems. The concept of using multi-stage vehicles with disposable energy pods has been explored and appears attractive although a major change in submarine design philosophy will be required if such vehicles are to launched from submarines. Another approach is to use a more space efficient source of oxygen. As seawater contains dissolved oxygen then if this source could be utilized to meet all or at least part of the engine`s need than a major design problem could be overcome. In this paper the findings of an initial study into the use of membranes or artificial gill techniques to provide oxygen for a Stirling powered DARPA type vehicle are presented. It has been found that only in certain sea areas is the concept of oxygen extraction feasible for use with power systems. Even in situations where there are sufficient levels of dissolved oxygen the gill system approach appears to have limited utility for UUV applications and a number of practical problems still need to be addressed.
Potter, I.J.; Reader, G.T. [Univ. of Calgary, Alberta (Canada). Dept. of Mechanical Engineering
A heat transfer apparatus includes a first chamber having a first heat transfer gas inlet, a second heat transfer gas inlet, and an outlet. A first heat transfer gas source provides a first gas flow to the first chamber through the first heat transfer gas inlet. A second gas flow through a second chamber connected to the side of the first chamber, generates acoustic waves which bring about acoustical coupling of the first and second gases in the acoustically augmented first chamber. The first chamber may also include a material inlet for receiving material to be dried, in which case the gas outlet serves as a dried material and gas outlet.
Bramlette, T. Tazwell (Livermore, CA); Keller, Jay O. (Oakland, CA)
Writing magnetic patterns with surface acoustic waves
A novel patterning technique that creates magnetization patterns in a continuous magnetostrictive film with surface acoustic waves is demonstrated. Patterns of 10??m wide stripes of alternating magnetization and a 3??m dot of reversed magnetization are written using standing and focusing acoustic waves, respectively. The magnetization pattern is size-tunable, erasable, and rewritable by changing the magnetic field and acoustic power. This versatility, along with its solid-state implementation (no moving parts) and electronic control, renders it as a promising technique for application in magnetic recording, magnonic signal processing, magnetic particle manipulation, and spatial magneto-optical modulation.
Li, Weiyang; Buford, Benjamin; Jander, Albrecht; Dhagat, Pallavi, E-mail: email@example.com [School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, Oregon 97331 (United States)
22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 1 Kinetic theory of Geodesic Acoustic
22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 1 Kinetic theory of Geodesic Acoustic Zonca, Liu Chen and Zhiyong Qiu #12;22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 2 Chen and Zhiyong Qiu #12;22nd IAEA-FEC Kinetic theory of Geodesic Acoustic Modes: ... 3 2 Linear
Zonca, Fulvio
An optimal consensus tracking control algorithm for autonomous underwater vehicles with disturbances
The optimal disturbance rejection control problem is considered for consensus tracking systems affected by external persistent disturbances and noise. Optimal estimated values of system states are obtained by recursive filtering for the multiple autonomous underwater vehicles modeled to multi-agent systems with Kalman filter. Then the feedforward-feedback optimal control law is deduced by solving the Riccati equations and matrix equations. The existence and uniqueness condition of feedforward-feedback optimal control law is proposed and the optimal control law algorithm is carried out. Lastly, simulations show the result is effectiveness with respect to external persistent disturbances and noise.
Zhang, Jian Yuan Wen-Xia
acoustic link capacity, are significantly different from ground-based mo- bile ad-hoc networks (MANET-disciplinary efforts of acoustic communication, signal pro- cessing and mobile acoustic network protocol design. I investigations, e.g., for marine incidents (especially involved with chemi- cal pollution and oil spill
Study on acoustics for SSC measurements Using the acoustic Doppler current profiler (ADCP) to
................................................................................................................................. 1 2. Background of higher- frequency, acoustic backscatterance sensors (ABS, for a review see Thorne and Hanes, 2002), and optical backscatterance sensors (OBS), whose sample ranges ar
Voulgaris, George
An acoustic energy framework for predicting combustion- driven acoustic instabilities in premixed gas-turbines
Instabilities in A Model Gas Turbine Combustor," Journal ofModel of Acoustic Response of Turbulent Premixed Flame and Its Application to Gas-Turbine
Ibrahim, Zuhair M. A.
COLLOQUE DE PHYSIQUE Colloque C2, suppl6ment au n02, Tome 51, F6vrier 1990
processing (sismic, underwater acoustic, array processing ...) the cross-spectralmatrix estimation (in time
(8, 22). Krill distributions are, however, notori-ously patchy (23), and point estimates of abun-
. Brierley, "Using an autonomous underwater vehicle as a platform for mesoscale acoustic sampling in marine
Arnold, Jonathan
E-Print Network 3.0 - acoustic energy-driven fluid Sample Search...
search results for: acoustic energy-driven fluid Page: << < 1 2 3 4 5 > >> 1 Acoustic Identification of Unknown Fluids Summary: Acoustic Identification of Unknown Fluids...
Institute of Fluid Mechanics and Engineering Acoustics
Institute of Fluid Mechanics and Engineering Acoustics Large Kundt's tubes Click to insert the image of the facility or test-rig Application area Facility Mechanical Property measurement Physical
Berlin,Technische Universität
Institute of Fluid Mechanics and Engineering Acoustics Sound Transmission Lab Click to insert the image of the facility or test-rig Application area Facility Mechanical Property measurement Physical
Surface acoustic wave dust deposition monitor
A system is disclosed for using the attenuation of surface acoustic waves to monitor real time dust deposition rates on surfaces. The system includes a signal generator, a tone-burst generator/amplifier connected to a transmitting transducer for converting electrical signals into acoustic waves. These waves are transmitted through a path defining means adjacent to a layer of dust and then, in turn, transmitted to a receiving transducer for changing the attenuated acoustic wave to electrical signals. The signals representing the attenuated acoustic waves may be amplified and used in a means for analyzing the output signals to produce an output indicative of the dust deposition rates and/or values of dust in the layer. 8 figs.
Fasching, G.E.; Smith, N.S. Jr.
Comparative Performance of Acoustic-tagged and PIT-tagged Juvenile Salmonids
Numerous research tools and technologies are currently being used to evaluate fish passage and survival to determine the impacts of the Federal Columbia River Power System (FCRPS) on endangered and threatened juvenile salmonids, including PIT tags, balloon tags, hydroacoustic evaluations, radio telemetry, and acoustic telemetry. Each has advantages and disadvantages, but options are restricted in some situations because of limited capabilities of a specific technology, lack of detection capability downstream, or availability of adequate numbers of fish. However, there remains concern about the comparative effects of the tag or the tagging procedure on fish performance. The recently developed Juvenile Salmonid Acoustic Telemetry System (JSATS) acoustic transmitter is the smallest active acoustic tag currently available. The goal of this study was to determine whether fish tagged with the JSATS acoustic-telemetry tag can provide unbiased estimates of passage behavior and survival within the performance life of the tag. We conducted both field and laboratory studies to assess tag effects. For the field evaluation we released a total of 996 acoustic-tagged fish in conjunction with 21,026 PIT-tagged fish into the tailrace of Lower Granite Dam on 6 and 13 May. Travel times between release and downstream dams were not significantly different for the majority of the reaches between acoustic-tagged and PIT-tagged fish. In addition to the field evaluation, a series of laboratory experiments were conducted to determine if growth and survival of juvenile Chinook salmon surgically implanted with acoustic transmitters is different than untagged or PIT tagged juvenile Chinook salmon. Only yearling fish with integrated and non-integrated transmitters experienced mortalities, and these were low (<4.5%). Mortality among sub-yearling control and PIT-tag treatments ranged up to 7.7% while integrated and non-integrated treatments had slightly higher rates (up to 8.3% and 7.9% respectively). No acoustic transmitters were shed by yearling fish during the course of the 90 day study. Up to 7.8% of subyearling fish expelled transmitters. Tags were expelled from 5 to 63 days post-surgery. The average time to expulsion was 27 days; few fish expelled transmitters within 14 days of implantation or less. Histological results suggest that inflammation associated with implantation of an acoustic transmitter can produce fibrous tissue which can invade and possibly damage internal organs soon after implantation. Reactions severe enough to damage organs however, were limited to only ~20% of subyearling Chinook salmon, all of which were under 101mm and 12g at tagging. The infiltration of the fibrous tissue into organs was observed most often in fish held for 21 days and appeared to decrease in subsequent holding times.
Hockersmith, Eric E.; Brown, Richard S.; Liedtke, Theresa L.
Tunable damper for an acoustic wave guide
A damper for tunably damping acoustic waves in an ultrasonic waveguide is provided which may be used in a hostile environment such as a nuclear reactor. The area of the waveguide, which may be a selected size metal rod in which acoustic waves are to be damped, is wrapped, or surrounded, by a mass of stainless steel wool. The wool wrapped portion is then sandwiched between tuning plates, which may also be stainless steel, by means of clamping screws which may be adjusted to change the clamping force of the sandwiched assembly along the waveguide section. The plates are preformed along their length in a sinusoidally bent pattern with a period approximately equal to the acoustic wavelength which is to be damped. The bent pattern of the opposing plates are in phase along their length relative to their sinusoidal patterns so that as the clamping screws are tightened a bending stress is applied to the waveguide at 180/sup 0/ intervals along the damping section to oppose the acoustic wave motions in the waveguide and provide good coupling of the wool to the guide. The damper is tuned by selectively tightening the clamping screws while monitoring the amplitude of the acoustic waves launched in the waveguide. It may be selectively tuned to damp particular acoustic wave modes (torsional or extensional, for example) and/or frequencies while allowing others to pass unattenuated.
Rogers, S.C.
ACOUSTIC REMOTE SENSING OF THE NORTH PACIFIC ON GYRE AND REGIONAL SCALES B. DUSHAW Applied Physics has evolved into a multipurpose remote sensing measurement technique that has been employed in a wide for observing regions of active convection, for measuring changes in integrated heat content, for observing
Dushaw, Brian
A coupled BEM and energy flow method for mid-high frequency internal acoustic
formalism whereas the SEA formalism is based on global energies of finite subsystems. This model has been using four energy variables: the total energy as well as the Lagrangian energy density, the activeA coupled BEM and energy flow method for mid-high frequency internal acoustic Sbastien BESSET, M
Paris-Sud XI, Université de
Apparatus for separating particles utilizing engineered acoustic contrast capture particles
An apparatus for separating particles from a medium includes a capillary defining a flow path therein that is in fluid communication with a medium source. The medium source includes engineered acoustic contrast capture particle having a predetermined acoustic contrast. The apparatus includes a vibration generator that is operable to produce at least one acoustic field within the flow path. The acoustic field produces a force potential minima for positive acoustic contrast particles and a force potential minima for negative acoustic contrast particles in the flow path and drives the engineered acoustic contrast capture particles to either the force potential minima for positive acoustic contrast particles or the force potential minima for negative acoustic contrast particles.
Kaduchak, Gregory (Los Alamos, NM); Ward, Michael D. (Los Alamos, NM)
Magneto acoustical emission in nanocrystalline Mn�Zn ferrites
Graphical abstract: Mn{sub 0.4}Zn{sub 0.6}Fe{sub 2}O{sub 4} powders were prepared by microwave hydrothermal method. The powders were characterized by X-ray diffraction, transmission electron microscope. The powders were sintered at different temperatures 400, 500, 600, 700, 800 and 900 �C/30 min using microwave sintering method. The grain size was estimated by scanning electron microscope. The room temperature dielectric and magnetic properties were studied in the frequency range (100 kHz�1.8 GHz). The magnetization properties were measured upto 1.5 T. The acoustic emission has been measured along the hysteresis loops from 80 K to Curie temperature. It is found that the magneto-acoustic emission (MAE) activity along hysteresis loop is proportional to the hysteresis losses during the same loop. This law has been verified on series of polycrystalline ferrites and found that the law is valid whatever the composition, the grain size and temperature. It is also found that the domain wall creation/or annihilation processes are the origin of the MAE. - Highlights: � The AE been measured along the hysteresis loops from 80 K to Curie temperature. � The MAE activity along hysteresis loop is proportional to P{sub h} during the same loop. � It is found that the domain wall creation/or annihilation processes are the origin of the MAE. - Abstract: Mn{sub 0.4}Zn{sub 0.6}Fe{sub 2}O{sub 4} powders were prepared by microwave hydrothermal method. The powders were characterized by X-ray diffraction, transmission electron microscope. The powders were sintered at different temperatures 400, 500, 600, 700, 800 and 900 �C/30 min using microwave sintering method. The grain size was estimated by scanning electron microscope. The room temperature dielectric and magnetic properties were studied in the frequency range (100 kHz�1.8 GHz). The magnetization properties were measured upto 1.5 T. The acoustic emission has been measured along the hysteresis loops from 80 K to Curie temperature. It is found that the magneto-acoustic emission (MAE) activity along hysteresis loop is proportional to the hysteresis losses during the same loop. This law has been verified on series of polycrystalline ferrites and found that the law is valid whatever the composition, the grain size and temperature. It is also found that the domain wall creation/or annihilation processes are the origin of the MAE.
Praveena, K., E-mail: firstname.lastname@example.com [Materials Research Centre, Indian Institute of Science, Bangalore 560012 (India); Department of Physics, Osmania University, Hyderabad 500007 (India); Murthty, S.R. [Department of Physics, Osmania University, Hyderabad 500007 (India)
526 IEEE JOURNAL OF OCEANIC ENGINEERING, VOL. 26, NO. 4, OCTOBER 2001 Power Systems for Autonomous Underwater Vehicles
-transfer (charging) techniques for Autonomous Underwater Vehicles (AUVs) operating within an Autonomous Ocean resource on these vehicles. Although there are other options, (nuclear, closed cycle diesel, fuel cell) we526 IEEE JOURNAL OF OCEANIC ENGINEERING, VOL. 26, NO. 4, OCTOBER 2001 Power Systems for Autonomous
Singh, Hanumant
IEEE JOURNAL OF OCEANIC ENGINEERING, VOL. 29, NO. 3, JULY 2004 651 Designing Future Underwater Vehicles: Principles
Vehicles: Principles and Mechanisms of the Weakly Electric Fish Malcolm A. MacIver, Ebraheem Fontaine, autonomous underwater vehicles, backward swimming, biologically inspired robotics, biorobotics, electric fish, and remotely operated vehicles (ROVs) that are powered and teleoperated via a tether connected to a surface
Hartmann, Mitra J. Z.
SOLAR-POWERED AUTONOMOUS UNDERWATER VEHICLE DEVELOPMENT James Jalbert, John Baker, John Duchesney, Paul Pietryka, William Dalton
batteries daily using solar panels to convert solar energy to electrical energy. #12;· Operate at depthsSOLAR-POWERED AUTONOMOUS UNDERWATER VEHICLE DEVELOPMENT James Jalbert, John Baker, John Duchesney in such applications. The concept of a vehicle that would allow on-station recharging of batteries, using solar cells
An Underwater Communication and Sensing Testbed in Marina del Rey Andrew Goodney, Young H. Cho, John Heidemann, John Wroclawski
awareness of environmental concerns such as runoff pollution and global climate change, and significant, as government and industry seek to observe, protect, exploit, and control resources underwater. With growing development and deployment. As an initial step, we designed, constructed and deployed two prototype testbed
424 IEEE JOURNAL OF OCEANIC ENGINEERING, VOL. 26, NO. 4, OCTOBER 2001 Seaglider: A Long-Range Autonomous Underwater
-Range Autonomous Underwater Vehicle for Oceanographic Research Charles C. Eriksen, T. James Osse, Russell D. Light--Seagliders are small, reusable autonomous un- derwater vehicles designed to glide from the ocean surface with techniques reliant on ships and moorings. Autonomous floats [1] have demonstrated the power of a distributed
A Bottom-Up Approach to Verification of Hybrid Model-Based Hierarchical Controllers with application to Underwater Vehicles
A Bottom-Up Approach to Verification of Hybrid Model-Based Hierarchical Controllers with application to Underwater Vehicles M. O'Connor, S. Tangirala, R. Kumar, S. Bhattacharyya, M. Sznaier and L.E. Holloway Abstract -- We present a systematic method of verification for a hierarchical hybrid system
Poster: Building a test-bed for wireless sensor networking for under-water oil and gas installations
. Initially we are building a laboratory in a large water tank. Later we will cooperate with an oil and gasPoster: Building a test-bed for wireless sensor networking for under-water oil and firstname.lastname@example.com 1 Introduction and background When the oil and gas industry moves its production facilities
Micromachined Optical and Acoustic Waveguide Systems for Advance Sensing and Imaging Applications
it possible to utilize single-crystalline silicon as a structural material for acoustic wave propagation. It enables the development of high-performance integrated acoustic circuits and allows direct acoustic signal processing and control. The acoustic...
Chang, Cheng-Chung
Method and apparatus of spectro-acoustically enhanced ultrasonic detection for diagnostics
An apparatus for detecting a discontinuity in a material includes a source of electromagnetic radiation has a wavelength and an intensity sufficient to induce an enhancement in contrast between a manifestation of an acoustic property in the material and of the acoustic property in the discontinuity, as compared to when the material is not irradiated by the electromagnetic radiation. An acoustic emitter directs acoustic waves to the discontinuity in the material. The acoustic waves have a sensitivity to the acoustic property. An acoustic receiver receives the acoustic waves generated by the acoustic emitter after the acoustic waves have interacted with the material and the discontinuity. The acoustic receiver also generates a signal representative of the acoustic waves received by the acoustic receiver. A processor, in communication with the acoustic receiver and responsive to the signal generated by the acoustic receiver, is programmed to generate informational output about the discontinuity based on the signal generated by the acoustic receiver.
Vo-Dinh, Tuan (Knoxville, TN); Norton, Stephen J. (Raleigh, NC)
E-Print Network 3.0 - acoustic emission characteristics Sample...
Department of Mechanical Engineering PENNPENNSSTATETATE Acoustic Analysis of Gas Turbine Combustion... InstabilityAcoustic Analysis of Gas Turbine Combustion Instability ...
E-Print Network 3.0 - acoustically coupled oscillations Sample...
E-Print Network 3.0 - acoustic cardiographic assessment Sample...
E-Print Network 3.0 - acoustically enhanced remediation Sample...
PENNPENNSSTATETATE Summary: Department of Mechanical Engineering PENNPENNSSTATETATE Acoustic Analysis of Gas Turbine Combustion... InstabilityAcoustic Analysis of Gas Turbine...
E-Print Network 3.0 - acoustic properties Sample Search Results
E-Print Network 3.0 - acoustic wave chemical Sample Search Results
Lyle N.- Department of Aerospace Engineering, Pennsylvania State University Collection: Engineering 8 Acoustic Identification of Unknown Fluids Summary: Acoustic Identification...
Intelligent front-end sample preparation tool using acoustic streaming.
We have successfully developed a nucleic acid extraction system based on a microacoustic lysis array coupled to an integrated nucleic acid extraction system all on a single cartridge. The microacoustic lysing array is based on 36{sup o} Y cut lithium niobate, which couples bulk acoustic waves (BAW) into the microchannels. The microchannels were fabricated using Mylar laminates and fused silica to form acoustic-fluidic interface cartridges. The transducer array consists of four active elements directed for cell lysis and one optional BAW element for mixing on the cartridge. The lysis system was modeled using one dimensional (1D) transmission line and two dimensional (2D) FEM models. For input powers required to lyse cells, the flow rate dictated the temperature change across the lysing region. From the computational models, a flow rate of 10 {micro}L/min produced a temperature rise of 23.2 C and only 6.7 C when flowing at 60 {micro}L/min. The measured temperature changes were 5 C less than the model. The computational models also permitted optimization of the acoustic coupling to the microchannel region and revealed the potential impact of thermal effects if not controlled. Using E. coli, we achieved a lysing efficacy of 49.9 {+-} 29.92 % based on a cell viability assay with a 757.2 % increase in ATP release within 20 seconds of acoustic exposure. A bench-top lysing system required 15-20 minutes operating up to 58 Watts to achieve the same level of cell lysis. We demonstrate that active mixing on the cartridge was critical to maximize binding and release of nucleic acid to the magnetic beads. Using a sol-gel silica bead matrix filled microchannel the extraction efficacy was 40%. The cartridge based magnetic bead system had an extraction efficiency of 19.2%. For an electric field based method that used Nafion films, a nucleic acid extraction efficiency of 66.3 % was achieved at 6 volts DC. For the flow rates we tested (10-50 {micro}L/min), the nucleic acid extraction time was 5-10 minutes for a volume of 50 {micro}L. Moreover, a unique feature of this technology is the ability to replace the cartridges for subsequent nucleic acid extractions.
Cooley, Erika J.; McClain, Jaime L.; Murton, Jaclyn K.; Edwards, Thayne L.; Achyuthan, Komandoor E.; Branch, Darren W.; Clem, Paul Gilbert; Anderson, John Mueller; James, Conrad D.; Smith, Gennifer; Kotulski, Joseph Daniel
Laser and acoustic lens for lithotripsy
An acoustic focusing device whose acoustic waves are generated by laser radiation through an optical fiber. The acoustic energy is capable of efficient destruction of renal and biliary calculi and deliverable to the site of the calculi via an endoscopic procedure. The device includes a transducer tip attached to the distal end of an optical fiber through which laser energy is directed. The transducer tip encapsulates an exogenous absorbing dye. Under proper irradiation conditions (high absorbed energy density, short pulse duration) a stress wave is produced via thermoelastic expansion of the absorber for the destruction of the calculi. The transducer tip can be configured into an acoustic lens such that the transmitted acoustic wave is shaped or focused. Also, compressive stress waves can be reflected off a high density/low density interface to invert the compressive wave into a tensile stress wave, and tensile stresses may be more effective in some instances in disrupting material as most materials are weaker in tension than compression. Estimations indicate that stress amplitudes provided by this device can be magnified more than 100 times, greatly improving the efficiency of optical energy for targeted material destruction.
Visuri, Steven R. (Livermore, CA); Makarewicz, Anthony J. (San Ramon, CA); London, Richard A. (Orinda, CA); Benett, William J. (Livermore, CA); Krulevitch, Peter (Pleasanton, CA); Da Silva, Luiz B. (Pleasanton, CA)
Dual excitation acoustic paramagnetic logging tool
New methods and apparatus are disclosed which allow measurement of the presence of oil and water in geological formations using a new physical effect called the Acoustic Paramagnetic Logging Effect (APLE). The presence of petroleum in formation causes a slight increase in the earth's magnetic field in the vicinity of the reservoir. This is the phenomena of paramagnetism. Application of an acoustic source to a geological formation at the Larmor frequency of the nucleons present causes the paramagnetism of the formation to disappear. This results in a decrease in the earth's magnetic field in the vicinity of the oil bearing formation. Repetitively frequency sweeping the acoustic source through the Larmor frequency of the nucleons present (approx. 2 kHz) causes an amplitude modulation of the earth's magnetic field which is a consequence of the APLE. The amplitude modulation of the earth's magnetic field is measured with an induction coil gradiometer and provides a direct measure of the amount of oil and water in the excitation zone of the formation. The phase of the signal is used to infer the longitudinal relaxation times of the fluids present, which results in the ability in general to separate oil and water and to measure the viscosity of the oil present. Such measurements may be performed in open boreholes and in cased well bores. The Dual Excitation Acoustic Paramagnetic Logging Tool employing two acoustic sources is also described. 6 figs.
Vail, W.B. III.
Laser-excited acoustic oscillations in silver and bismuth nanowires
Coherent acoustic oscillations in Bi and Ag nanowire samples were studied with a femtosecond pump-probe technique and detection of the scattered light. The observed optical and acoustic properties reflect the nanostructure of these materials...
Jerebtsov, Sergey N.; Kolomenskii, Alexandre A.; Liu, Haidong; Zhang, Hong; Ye, Zuxin; Luo, Zhiping; Wu, Wenhao; Paulus, Gerhard G.; Schuessler, Hans A.
Acoustic and Seismic Modalities for Unattended Ground Sensors
In this paper, we have presented the relative advantages and complementary aspects of acoustic and seismic ground sensors. A detailed description of both acoustic and seismic ground sensing methods has been provided. Acoustic and seismic phenomenology including source mechanisms, propagation paths, attenuation, and sensing have been discussed in detail. The effects of seismo-acoustic and acousto-seismic interactions as well as recommendations for minimizing seismic/acoustic cross talk have been highlighted. We have shown representative acoustic and seismic ground sensor data to illustrate the advantages and complementary aspects of the two modalities. The data illustrate that seismic transducers often respond to acoustic excitation through acousto-seismic coupling. Based on these results, we discussed the implications of this phenomenology on the detection, identification, and localization objectives of unattended ground sensors. We have concluded with a methodology for selecting the preferred modality (acoustic and/or seismic) for a particular application.
Elbring, G.J.; Ladd, M.D.; McDonald, T.S.; Sleefe, G.E.
Finite Element Methods for Nonlinear Acoustics in Fluids
resonating acoustic cavity, and a coupled elastic/acoustic system consisting of ... linear terms in these wave equations imply that the sound speed depends on the ... have zero shear modulus, this approach suffers from an infinite dimensional�...
Methods and apparatus for multi-parameter acoustic signature inspection
A multiparameter acoustic signature inspection device and method are described for non-invasive inspection of containers. Dual acoustic signatures discriminate between various fluids and materials for identification of the same.
Diaz, Aaron A. (Richland, WA); Samuel, Todd J. (Pasco, WA); Valencia, Juan D. (Kennewick, WA); Gervais, Kevin L. (Richland, WA); Tucker, Brian J. (Pasco, WA); Kirihara, Leslie J. (Richland, WA); Skorpik, James R. (Kennewick, WA); Reid, Larry D. (Benton City, WA); Munley, John T. (Benton City, WA); Pappas, Richard A. (Richland, WA); Wright, Bob W. (West Richland, WA); Panetta, Paul D. (Richland, WA); Thompson, Jason S. (Richland, WA)
Acoustic clouds: standing sound waves around a black hole analogue
Under certain conditions sound waves in fluids experience an acoustic horizon with analogue properties to those of a black hole event horizon. In particular, a draining bathtub-like model can give rise to a rotating acoustic horizon and hence a rotating black hole (acoustic) analogue. We show that sound waves, when enclosed in a cylindrical cavity, can form stationary waves around such rotating acoustic black holes. These acoustic perturbations display similar properties to the scalar clouds that have been studied around Kerr and Kerr-Newman black holes; thus they are dubbed acoustic clouds. We make the comparison between scalar clouds around Kerr black holes and acoustic clouds around the draining bathtub explicit by studying also the properties of scalar clouds around Kerr black holes enclosed in a cavity. Acoustic clouds suggest the possibility of testing, experimentally, the existence and properties of black hole clouds, using analog models.
Carolina L. Benone; Luis C. B. Crispino; Carlos Herdeiro; Eugen Radu
Benone, Carolina L; Herdeiro, Carlos; Radu, Eugen
Acoustic characteristics of bay bottom sediments in Lavaca Bay, TX
acoustic return of the bay bottom, and 2) strong, shallow reflectors??surface strong, mounds, buried strong, andburied multiples, which describe strong acoustic returns in the upper 5 m of stratigraphy. Within the lower package, four categories were...
Patch, Mary Catherine
13.853 Computational Ocean Acoustics, Spring 2003
Wave equations for fluid and visco-elastic media. Wave-theory formulations of acoustic source radiation and seismo-acoustic propagation in stratified ocean waveguides. Wavenumber Integration and Normal Mode methods for ...
13.811 Advanced Structural Dynamics and Acoustics, Spring 2004
Foundations of 3D elasticity. Fluid and elastic wave equations. Elastic and plastic waves in rods and beams. Waves in plates. Interaction with an acoustic fluid. Dynamics and acoustics of cylindrical shells. Radiation and ...
Hybrid percussion : extending physical instruments using sampled acoustics
This thesis presents a system architecture for creating hybrid digital-acoustic percussion instruments by combining extensions of existing signal processing techniques with specially-designed semi-acoustic physical ...
Aimi, Roberto Mario, 1973-
Ultrafast photo-acoustic spectroscopy of super-cooled liquids
Picosecond laser ultrasonic techniques for acoustic wave generation and detection were adapted to probe longitudinal and transverse acoustic waves in liquids at gigahertz frequencies. The experimental effort was designed ...
Klieber, Christoph
Acoustic measurement of the Deepwater Horizon Macondo well flow rate
On May 31, 2010, a direct acoustic measurement method was used to quantify fluid leakage rate from the Deepwater Horizon Macondo well prior to removal of its broken riser. This method utilized an acoustic imaging sonar and ...
Camilli, Richard
acoustical response: Topics by E-print Network
... 10 Sources of Wind Turbine Sound Massachusetts at Amherst, University of 195 Acoustic Laptops as a research...
Point interactions in acoustics: one dimensional models
A one dimensional system made up of a compressible fluid and several mechanical oscillators, coupled to the acoustic field in the fluid, is analyzed for different settings of the oscillators array. The dynamical models are formulated in terms of singular perturbations of the decoupled dynamics of the acoustic field and the mechanical oscillators. Detailed spectral properties of the generators of the dynamics are given for each model we consider. In the case of a periodic array of mechanical oscillators it is shown that the energy spectrum presents a band structure.
C. Cacciapuoti; R. Figari; A. Posilicano
Acoustic probing of salt using sonar
, glycerine, and s1li cone oil provi ded satisfactory performance. In spite of these results, Gupta did not develop a workable means of us1ng 11quid coupl1ng media under mine condit1ons. In his field tests, Gupta used dental impression plaster (a coupling... acoustic pulses which are coupled 1nto the salt via a castor oil coupling medium. The acoustic source signa'i is a square-enveloped pulse of compress1onal waves; a pulse duration of e1ther 0. 3 ms or 1. 1 ms is used. The ranges to discontinuities...
Butler, Kenneth Bryan
Acoustic microscope surface inspection system and method
An acoustic microscope surface inspection system and method are described in which pulses of high frequency electrical energy are applied to a transducer which forms and focuses acoustic energy onto a selected location on the surface of an object and receives energy from the location and generates electrical pulses. The phase of the high frequency electrical signal pulses are stepped with respect to the phase of a reference signal at said location. An output signal is generated which is indicative of the surface of said selected location. The object is scanned to provide output signals representative of the surface at a plurality of surface locations. 7 figures.
Khuri-Yakub, B.T.; Parent, P.; Reinholdtsen, P.A.
Linear phase distribution of acoustical vortices
Linear phase distribution of phase-coded acoustical vortices was theoretically investigated based on the radiation theory of point source, and then confirmed by experimental measurements. With the proposed criterion of positive phase slope, the possibility of constructing linear circular phase distributions is demonstrated to be determined by source parameters. Improved phase linearity can be achieved at larger source number, lower frequency, smaller vortex radius, and/or longer axial distance. Good agreements are observed between numerical simulations and measurement results for circular phase distributions. The favorable results confirm the feasibility of precise phase control for acoustical vortices and suggest potential applications in particle manipulation.
Gao, Lu; Zheng, Haixiang [Key Laboratory of Optoelectronics of Jiangsu Province, School of Physics Science and Technology, Nanjing Normal University, 1 Wenyuan Road, Xianlin District, Nanjing 210023 (China); Ma, Qingyu, E-mail: firstname.lastname@example.com [Key Laboratory of Optoelectronics of Jiangsu Province, School of Physics Science and Technology, Nanjing Normal University, 1 Wenyuan Road, Xianlin District, Nanjing 210023 (China); Laboratory of Modern Acoustics of MOE, Nanjing University, Nanjing 210093 (China); Tu, Juan; Zhang, Dong [Laboratory of Modern Acoustics of MOE, Nanjing University, Nanjing 210093 (China)
Offices and dwellings: what building acoustics for sustainable development?
Offices and dwellings: what building acoustics for sustainable development? M. Asselineau, email@example.com Proceedings of the Acoustics 2012 Nantes Conference 23-27 April 2012, Nantes, France 3211 #12;Sustainability for sustainable projects as defined in the French standards, one specifically deals with acoustic comfort. Over
Acoustics of Two-Phase Pipe Flows Samenstelling promotiecommissie
Acoustics of Two-Phase Pipe Flows #12;Samenstelling promotiecommissie: prof. dr. ir. L. van Universiteit Twente Acoustics of Two-Phase Pipe Flows P.J. van Dijk Cover: Lidewij van Rijssen Printed. ISBN 90-365-2188-2 c P.J. van Dijk, 2005. #12;ACOUSTICS OF TWO-PHASE PIPE FLOWS PROEFSCHRIFT ter
Twente, Universiteit
Kinetic theory of geodesic acoustic and related modes
Kinetic theory of geodesic acoustic and related modes A.I. Smolyakov Department of Physics · Geodesic Acoustic Modes (GAM) are relatively high frequency eigen-modes supported by plasma compressibility history of GAM and related modes ·1968 : Geodesic acoustic modes: Winsor, Johnson, Dawson ·2000-05: Surge
A new acoustic three dimensional intensity and energy density probe
A new acoustic three dimensional intensity and energy density probe F. Aymea , C. Carioub , M is a great advantage. In this frame, a new intensity acoustic probe has been developed to compute acoustic quantities which can be input data for energetic identification methods. 1 Introduction Noise matters
Acoustic-emission monitoring during hydraulic fracturing
This paper reports that microseismic events or acoustic emissions associated with hydraulic fracturing are recorded with a borehole seismic tool in a deviated well during multirate injection, shut-in, and flowback. The event locations indicate that fracture orientation, length, and height are compatible with regional stress directions and estimates of the fracture size that are based on pressure decline.
Stewart, L. (Schlumberger-Doll Research (US)); Cassell, B.R. (Schlumberger Wireline Services (US)); Bol, G.M. (Nederlanse Aardolie Mij. B.V. (NL))
Non-Riemannian geometry of vortex acoustics
The concept of acoustic torsion is introduced by making use of the scalar wave equation in Riemann-Cartan spacetime. Acoustic torsion extends the acoustic metric previously given by Unruh (PRL-1981). The wave equation describes irrotational perturbations in rotational nonrelativistic fluids. This physical motivation allows us to show that the acoustic line element can be conformally mapped to the line element of a stationary torsion loop in non-Riemannian gravity. Two examples of such sonic analogues are given. The first is the stationary torsion loop in teleparallel gravity. In the far from the vortex approximation, the Cartan torsion vector is shown to be proportional to the quantum vortex number of the superfluid. The torsion vector is also shown to be proportional to the superfluid vorticity in the presence of vortices. The formation of superfluid vortices is shown not to be favored by torsion loops in Riemann-Cartan spacetime, as long as this model is concerned. It is suggested that the teleparallel model may help to find a model for superfluid neutron stars vortices based on non-Riemannian gravity.
Garcia de Andrade, L.C. [Departamento de Fisica Teorica, Instituto de Fisica, Universidade Estadual do Rio de Janeiro, Rua Sao Francisco Xavier 524, Maracana, 20550, Rio de Janeiro, RJ (Brazil)
Ocean Climate Change: Comparison of Acoustic
Ocean Climate Change: Comparison of Acoustic Tomography, Satellite Altimetry, and Modeling The ATOC to thermal expansion. Interpreting climate change signals from fluctuations in sea level is therefore in the advective heat flux. Changes in oceanic heat storage are a major expected element of future climate shifts
Thermoacoustic Stirling Engine --An acoustic amplifier
National Laboratory Condensed Matter and Thermal Physics Group MS K764, Los Alamos, NM 87545 backhaus) efficiencies 6" 24 " 72 " Acoustic power: 100 W 1 kW 50 kW T.A. efficiency: 23% 30% 25% All-metal bonded PZT stacks Metal joints, rather than epoxy joints, between PZT elements allow stacks to generate high power
Lee, Dongwon
VBF: Vector-Based Forwarding Protocol for Underwater Sensor Networks Peng Xie, Jun-Hong Cui, Li Lao
important for various applications, such as oceanographic data collection, pollution detection, and marine latency in UWSNs. Acoustic channels (instead of RF channels) are used as the communication method since radio does not work well in water. The propagation speed of acoustic signals in water is about 1.5 �? 103
A joint time-scale representation methodology for the detection of acoustic gravity wave induced by solar eclipses
by solar eclipses St´ephane G. Roux1, Petra Sauli2, Josef Boska2, Patrice Abry1 1 Laboratoire de Physique three different solar eclipses. It enables us to evidence the existence of several acoustic by geomagnetic and consequent auroral activity, meteorological phenomena, excitation in situ by solar terminators
Development of a geothermal acoustic borehole televiewer
Most geothermal wells are drilled in hard rock formations where fluid flow is through systems of open fractures. Productivity of these wells is usually determined by the extent of intersection of the wellbore with the fracture system. A need exists for fracture mapping methods and tools which can operate in a geothermal environment. In less hostile environments, the acoustic borehole televiewer has been shown to be a useful tool for determining location, orientation, and characterization of fractures as they intersect the borehole and for general wellbore and casing inspection. The development conducted at Sandia National Laboratories to adapt an acoustic borehole televiewer for operation in a geothermal environment is described. The modified instrument has been successfully tested at temperatures as high as 280/sup 0/C and pressures up to 5000 psi, and used successfully to map fractures and casing damage in geothermal wells.
Heard, F.E.; Bauman, T.J.
Acoustic data transmission through a drillstring
A method and apparatus for acoustically transmitting data along a drillstring is presented. In accordance with one embodiment of the present invention, acoustic data signals are conditioned to counteract distortions caused by the drillstring. Preferably, this conditioning step comprises multiplying each frequency component of the data signal by exp (-ikL) where L is the transmission length of the drillstring, k is the wave number in the drillstring at the frequency of each component and i is (-1).sup.1/2. In another embodiment of this invention, data signals having a frequency content in at least one passband of the drillstring are generated preferably traveling in only one direction (e.g., up the drillstring) while echoes in the drillstring resulting from the data transmission are suppressed.
A method and apparatus for acoustically transmitting data along a drillstring are presented. In accordance with one embodiment of the present invention, acoustic data signals are conditioned to counteract distortions caused by the drillstring. Preferably, this conditioning step comprises multiplying each frequency component of the data signal by exp ([minus]ikL) where L is the transmission length of the drillstring, k is the wave number in the drillstring at the frequency of each component and i is ([minus]1)[sup 1/2]. In another embodiment of this invention, data signals having a frequency content in at least one passband of the drillstring are generated preferably traveling in only one direction (e.g., up the drillstring) while echoes in the drillstring resulting from the data transmission are suppressed. 20 figs.
Pulse combusted acoustic agglomeration apparatus and process
An improved apparatus and process for removal of particulates entrained in a gas stream are provided. The removal process employs a pulse combustor to provide an acoustic pressure wave to acoustically enhance bimodal agglomeration of particulates which may be collected and removed using a conventional separation apparatus. A particulate having a size different from the size of the particulate in the gas stream to be cleaned is introduced into the system to effectuate the bimodal process. The apparatus may be employed as a direct fired system for improved operation of gas-operated equipment such as a gas turbine, or may, alternatively, be employed as an add-on subsystem for combustion exhaust clean-up. Additionally, the added particulate may be a sorbent for effecting sorption of other contaminants such as sulfur. Various other particulates for contaminant removal may also be introduced into the system as exemplified by alkali-gettering agents.
Mansour, Momtaz N. (Columbia, MD)
An improved apparatus and process for removal of particulates entrained in a gas stream are provided. The removal process employs a pulse combustor to provide an acoustic pressure wave to acoustically enhance agglomeration of particulates which may be collected and removed using a conventional separation apparatus. The apparatus may be employed as a direct fired system for improved operation of gas-operated equipment such as a gas turbine, or may, alternatively, be employed as an add-on subsystem for combustion exhaust clean-up. Additionally, added particulates may include a sorbent for effecting sorption of other contaminants such as sulfur. Various other particulates for contaminant removal may also be introduced into the system as exemplified by alkali-gettering agents.
Mansour, Momtaz N. (Columbia, MD); Chandran, Ravi (Ellicott City, MD)
Peculiarity of convergence of shock wave generated by underwater electrical explosion of ring-shaped wire
Nanosecond timescale underwater electrical wire explosions of ring-shaped Cu wires were investigated using a pulsed generator with a current amplitude up to 50 kA. It was shown that this type of wire explosion results in the generation of a toroidal shock wave (SW). Time- and space-resolved optical diagnostics were used to determine azimuthal uniformity of the shock wave front and its velocity. It was found that the shock wave preserves its circular front shape in the range of radii 50?m
Shafer, D.; Toker, G. R.; Gurovich, V. Tz.; Gleizer, S.; Krasik, Ya. E. [Physics Department, Technion, Haifa 32000 (Israel)] [Physics Department, Technion, Haifa 32000 (Israel)
Shafer, D.; Toker, G. R.; Gurovich, V. Tz.; Gleizer, S.; Krasik, Ya. E. [Physics Department, Technion, Haifa 32000 (Israel)] [Physics Department, Technion, Haifa 32000 (Israel)
Infrastructure for thulium-170 isotope power systems for autonomous underwater vehicle fleets
The radioisotope thulium-170 is a safe and environmentally benign heat source for providing the high endurance and energy densities needed by advanced power systems for autonomous underwater vehicles (AUV). Thulium Isotope Power (TIP) systems have an endurance of {approximately}3000 h, and gravimetric and volumetric energy densities of 3 {times} 10{sup 4} Wh/kg and 3 {times} 10{sup 8} Wh/m{sup 3}, respectively. These energy densities are more than 200 times higher than those currently provided by Ag-Zn battery technology. In order to capitalize on these performance levels with about one hundred AUVs in continuous use, it will be necessary to establish an infrastructure for isotope production and heat-source refurbishment. The infrastructure cost is not trivial, and studies are needed to determine its optimum configuration. The major component of the projected infrastructure is the nuclear reactor used to produce Tm- 170 by neutron absorption in Tm-169. The reactor design should ideally be optimized for TM-170 production. Using the byproduct waste'' heat beneficially would help defray the cost of isotope production. However, generating electric power with the reactor would compromise both the cost of electricity and the isotope production capacity. A coastal location for the reactor would be most convenient from end-use considerations, and the waste'' heat could be used to desalinate seawater in water-thirsty states. 13 refs., 6 figs., 2 tabs.
Walter, C.E.
Acoustic measurement of potato cannon velocity
This article describes measurement of potato cannon velocity with a digitized microphone signal. A microphone is attached to the potato cannon muzzle and a potato is fired at an aluminum target about 10 m away. The potato's flight time can be determined from the acoustic waveform by subtracting the time in the barrel and time for sound to return from the target. The potato velocity is simply the flight distance divided by the flight time.
Courtney, M; Courtney, Amy; Courtney, Michael
Acoustic enhancement for photo detecting devices
Provided are improvements to photo detecting devices and methods for enhancing the sensitivity of photo detecting devices. A photo detecting device generates an electronic signal in response to a received light pulse. An electro-mechanical acoustic resonator, electrically coupled to the photo detecting device, damps the electronic signal and increases the signal noise ratio (SNR) of the electronic signal. Increased photo detector standoff distances and sensitivities will result.
Thundat, Thomas G; Senesac, Lawrence R; Van Neste, Charles W
P. J. Antsaklis, "Intelligent Control for High Autonomy in Unmanned Underwater Vehicles," P r oceedings of t he N SF/ISR W orkshop o n ' Undersea R obotics a nd I ntelligent C ontrol ' , pp. 25-32, Lisboa, Portugal,
P. J. Antsaklis, "Intelligent Control for High Autonomy in Unmanned Underwater Vehicles," P r in Unmanned Underwater Vehicles," P r oceedings of t he N SF/ISR W orkshop o n ' Undersea R obotics a nd I Control for High Autonomy in Unmanned Underwater Vehicles," P r oceedings of t he N SF/ISR W orkshop o n
Antsaklis, Panos
P.J. Antsaklis, "Hybrid and Supervisory Control Systems in Autonomous Underwater Vehicles," First International Workshop on A utonomous U nderwater V ehicles f o r S hallow W aters a nd C oastal
P.J. Antsaklis, "Hybrid and Supervisory Control Systems in Autonomous Underwater Vehicles," First, "Hybrid and Supervisory Control Systems in Autonomous Underwater Vehicles," First International Workshop , pp. 135-139, Lafayette, Louisiana, February 17-19, 1998. #12;P.J. Antsaklis, "Hybrid and Supervisory
Scanning acoustic microscopy for mapping the microstructure of soft materials
Acoustics provides a powerful modality with which to 'see' the mechanical properties of a wide range of elastic materials. It is particularly adept at probing soft materials where excellent contrast and propagation distance can be achieved. We have constructed a scanning acoustic microscope capable of mapping the microstructure of such materials. We review the general principles of scanning acoustic microscopy and present new examples of its application in imaging biological matter, industrial materials and particulate systems.
N. G. Parker; M. J. W. Povey
Electret Acoustic Transducer Array For Computerized Ultrasound Risk Evaluation System
An electret-based acoustic transducer array is provided and may be used in a system for examining tissue. The acoustic transducer array is formed with a substrate that has a multiple distinct cells formed therein. Within each of the distinct cells is positioned an acoustic transducing element formed of an electret material. A conductive membrane is formed over the distinct cells and may be flexible.
Moore, Thomas L. (Livermore, CA); Fisher, Karl A. (Brentwood, CA)
acoustic source localization: Topics by E-print Network
Dan 113 2011 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics October 16-19, 2011, New Paltz, NY INFORMED SOURCE SEPARATION: UNDERDETERMINED SOURCE SIGNAL...
Photo of the Week: Acoustic Levitation for Medicine | Department...
ld-levitation-inspire-better-pharmaceuticals" target"blank">here. | Photo by Dan Harris, Argonne National Laboratory. This acoustic levitator was originally developed to help...
acoustic environments prediction: Topics by E-print Network
1998, 2001 production by small animals limit the efficiency of sound communication (Bennet-Clark, 1998; Larsen Elias, Damian Octavio 135 Acoustic Source Localization Using the...
acoustic wave properties: Topics by E-print Network
1998, 2001 production by small animals limit the efficiency of sound communication (Bennet-Clark, 1998; Larsen Elias, Damian Octavio 136 Effect of drift-acoustic waves on...
acoustic mate recognition: Topics by E-print Network
occurs when an expected phone is pronounced as a different one, which leads to erroneous recognition. Acoustic confusion occurs when the pronounced phone is found to lie...
acoustic power absorption: Topics by E-print Network
The distribution of acoustic power over sunspots shows an enhanced absorption near the umbra--penumbra boundary. Earlier studies revealed that the region of enhanced absorption...
acoustic field evaluation: Topics by E-print Network
acoustic field produced: Topics by E-print Network
acoustic focusing devices: Topics by E-print Network
in suitable environment, therefore to produce maximum efficiency. In this paper, we present an acoustic wave actuated micro-generator for power system by using the energy of...
acoustic wave devices: Topics by E-print Network
Baron, G. Martin, T. Laroche, and S. Ballandras FEMTO Paris-Sud XI, Universit de 7 Design and Fabrication of Acoustic Wave Actuated Microgenerator for Portable Electronic...
acoustic wave device: Topics by E-print Network
to permeability in the reservoir. Acoustic image logs reveal a similar natural fracture population, but generally image slightly fewer fractures, and do not reveal rock...
Independent trapping and manipulation of microparticles using dexterous acoustic tweezers
An electronically controlled acoustic tweezer was used to demonstrate two acoustic manipulation phenomena: superposition of Bessel functions to allow independent manipulation of multiple particles and the use of higher-order Bessel functions to trap particles in larger regions than is possible with first-order traps. The acoustic tweezers consist of a circular 64-element ultrasonic array operating at 2.35?MHz which generates ultrasonic pressure fields in a millimeter-scale fluid-filled chamber. The manipulation capabilities were demonstrated experimentally with 45 and 90-?m-diameter polystyrene spheres. These capabilities bring the dexterity of acoustic tweezers substantially closer to that of optical tweezers.
Courtney, Charles R. P., E-mail: firstname.lastname@example.com [Department of Mechanical Engineering, University of Bath, Bath (United Kingdom); Demore, Christine E. M.; Wu, Hongxiao; Cochran, Sandy [Institute of Medical Science and Technology, University of Dundee, Dundee (United Kingdom); Grinenko, Alon; Wilcox, Paul D.; Drinkwater, Bruce W. [Department of Mechanical Engineering, University of Bristol, Bristol (United Kingdom)
acoustic doppler current: Topics by E-print Network
from Vibro-Acoustic Heart Signals: Correlation. In this work, heart sounds, apical pulse, and arterial pulse signals were simultaneously acquired, along analysis of...
acoustic wave secondary: Topics by E-print Network
the deep ocean, they are refracted by inhomogeneities Tomsovic, Steve 10 Unidirectional propagation of designer surface acoustic waves CERN Preprints Summary: We propose an...
acoustic wave monitoring: Topics by E-print Network
the deep ocean, they are refracted by inhomogeneities Tomsovic, Steve 14 Unidirectional propagation of designer surface acoustic waves CERN Preprints Summary: We propose an...
acoustic phonon scattering: Topics by E-print Network
type of phononic crystals manufactured Institute of Physics. DOI: 10.10631.2167794 The propagation of acoustic waves in periodic composite Deymier, Pierre 19 Carrier and Phonon...
acoustic wave biosensor: Topics by E-print Network
the deep ocean, they are refracted by inhomogeneities Tomsovic, Steve 11 Unidirectional propagation of designer surface acoustic waves CERN Preprints Summary: We propose an...
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acoustic emission technique: Topics by E-print Network
Acoustic scattering by axisymmertic finite-length bodies with application to fish : measurement and modeling
This thesis investigates the complexities of acoustic scattering by finite bodies in general and by fish in particular through the development of an advanced acoustic scattering model and detailed laboratory acoustic ...
Reeder, D. Benjamin (Davis Benjamin), 1966-
Summary engineering description of underwater fuel storage facility for foreign research reactor spent nuclear fuel
This document is a summary description for an Underwater Fuel Storage Facility (UFSF) for foreign research reactor (FRR) spent nuclear fuel (SNF). A FRR SNF environmental Impact Statement (EIS) is being prepared and will include both wet and dry storage facilities as storage alternatives. For the UFSF presented in this document, a specific site is not chosen. This facility can be sited at any one of the five locations under consideration in the EIS. These locations are the Idaho National Engineering Laboratory, Savannah River Site, Hanford, Oak Ridge National Laboratory, and Nevada Test Site. Generic facility environmental impacts and emissions are provided in this report. A baseline fuel element is defined in Section 2.2, and the results of a fission product analysis are presented. Requirements for a storage facility have been researched and are summarized in Section 3. Section 4 describes three facility options: (1) the Centralized-UFSF, which would store the entire fuel element quantity in a single facility at a single location, (2) the Regionalized Large-UFSF, which would store 75% of the fuel element quantity in some region of the country, and (3) the Regionalized Small-UFSF, which would store 25% of the fuel element quantity, with the possibility of a number of these facilities in various regions throughout the country. The operational philosophy is presented in Section 5, and Section 6 contains a description of the equipment. Section 7 defines the utilities required for the facility. Cost estimates are discussed in Section 8, and detailed cost estimates are included. Impacts to worker safety, public safety, and the environment are discussed in Section 9. Accidental releases are presented in Section 10. Standard Environmental Impact Forms are included in Section 11.
Dahlke, H.J.; Johnson, D.A.; Rawlins, J.K.; Searle, D.K.; Wachs, G.W.
E-Print Network 3.0 - acoustic cavitation bubble Sample Search...
Collection: Physics 62 Acoustic saturation in bubbly cavitating flow adjacent to an oscillating wall T. Colonius,a) Summary: Acoustic saturation in bubbly cavitating flow...
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text... III Center for Computer Research in Music and Acoustics (CCRMA) ... Source: Smith III, Julius Orion - Center for Computer Research in Music and Acoustics, Stanford...
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'acoustique 1990 APPLICATION OF FAST HARTLEY TRANSFORM TO ACOUSTIC INTENSITY MEASUREMENT W.S. GAN Acoustical... Services (1989)Pte Ltd, 29 Telok Ayer Street, Singapore 0104....
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Collection: Mathematics 31 Acoustic Identification of Unknown Fluids Summary: Acoustic Identification of Unknown Fluids Executive Overview: Scientists at Los Alamos National......
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for: acoustic multivariate condition Page: << < 1 2 3 4 5 > >> 1 ME706: Acoustics & Aerodynamic Sound Aerodynamic sound is the noise' produced by hydrodynamic (turbulent')...
alv-x1 liftoff acoustic: Topics by E-print Network
The reduction of weight of multi 23 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
acoustic wave-assisted scanning: Topics by E-print Network
gent transportation systems (ITS 17 UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging Geosciences Websites Summary: UNIVERSITY OF CALIFORNIA, SAN...
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Sample search results for: acoustic startle responding Page: << < 1 2 3 4 5 > >> 1 Cognitive, Affective, & Behavioral Neuroscience 2004, 4 (3), 307-316 Summary: acoustic startle...
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with the cooler air. Since the timing in the acoustic cycle is such that maximum heat transfer corresponds... . Under such conditions, acoustic amplification is...
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Plasma actuator, flow control, acoustic control, airframe noise 1. INTRODUCTION 1.1. Background... applications. Section 3 reviews some applications related to aero-acoustics,...
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Woods Hole Oceanographic Institution Collection: Engineering 23 Kinetic theory of geodesic acoustic and related modes Summary: Kinetic theory of geodesic acoustic and related...
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variable, and the spectrum of an acoustic instrument... . In this work, acoustic performances are analyzed to derive amplitude and frequency envelopes... less envelope shape...
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of Electromagnetism and Acoustics Institute of Electrical Engineering 12;EE... Industrial Day. Page 2 Electromagnetism, Acoustics, Microwaves, Antennas LEMA at a glance...
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OCEAN Summary: A COMPARISON OF ACOUSTIC THERMOMETRY, XBT, TOPEX, AND HOT OBSERVATIONS OF OCEAN TEMPERATURE... @apl.washington.edu) Abstract - Acoustic thermometry offers naturally...
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93 Reflection of Nonlinear Acoustic Waves from the Mechanically Free Surface of an Unconsolidated Granular Medium Summary: 1 Reflection of Nonlinear Acoustic Waves from the...
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98 Reflection of Nonlinear Acoustic Waves from the Mechanically Free Surface of an Unconsolidated Granular Medium Summary: 1 Reflection of Nonlinear Acoustic Waves from the...
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Follow geometry and physical properties of a desired acoustic system Efficient Source: Smith III, Julius Orion - Center for Computer Research in Music and Acoustics, Stanford...
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of perceptual measurements Statistics for acoustics experiments Acoustics of porous media . The second... of Waveguides: Wave propagation in a guide Mode matching ...
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Grant Collection: Engineering 20 Wave Gliders for Acoustic Applications Asst. Prof. Brian Bingham Summary: the design of a vehicle with integrated acoustic communication and...
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; Physics 2 Ion acoustic wave generation by a standing electromagnetic field in a subcritical plasma Summary: 233 Ion acoustic wave generation by a standing electromagnetic...
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Acoustical and Noise Control Criteria and Guidelines for Building Design and Operations
Noise, vibration and acoustical design, construction, commissioning and operation practices influence building cost, efficiency, performance and effectiveness. Parameters for structural vibration, building systems noise, acoustics and environmental...
Evans, J. B.; Himmel, C. N.
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Mitigation of Acoustic Resonance using Electrically Shunted Loudspeakers Summary: and resistor. Experimental application to a closed acoustic duct results in 14 dB pressure...
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of ocean inhomogeneities by the times structure of an acoustic signal XN... acoustic tomography of the ocean is discussed. The method is based on the fact that ... Source:...
Proceedings of Acoustics 2012 -Fremantle 21-23 November 2012, Fremantle, Australia Australian Acoustical Society 1
Proceedings of Acoustics 2012 - Fremantle 21-23 November 2012, Fremantle, Australia Australian consequently became the one of the dominant styles in Western and other musics. THE VOICE vs. OTHER MUSICAL string is excited by striking--an impulsive and therefore broad-band mechanism for energy input. In bowed
New South Wales, University of
The naval Research Laboratory has been actively involved in research in unmanned and autonomous systems since its opening in 1923. From one of the first unmanned
systems since its opening in 1923. From one of the first unmanned ground vehicles to the developmentThe naval Research Laboratory has been actively involved in research in unmanned and autonomous of more than 200 prototype air, ground, underwater, and space platforms, and from smart sensors to smart
Sound Science: Taking Action with Acoustics
ScienceCinema (OSTI)
From tin whistles to sonic booms, sound waves interact with each other and with the medium through which they travel. By observing these interactions, we can identify substances that are hidden in sealed containers and obtain images of buried objects. By manipulating the ability of sound to push matter around, we can create novel structures and unique materials. Join the Lab's own sound hound, Dipen Sinha, as he describes how he uses fundamental research in acoustics for solving problems in industry, security and health.
Sinha, Dipen
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