video_id
stringlengths 11
11
| text
stringlengths 361
490
| start_second
int64 0
11.3k
| end_second
int64 18
11.3k
| url
stringlengths 48
52
| title
stringlengths 0
100
| thumbnail
stringlengths 0
52
|
|---|---|---|---|---|---|---|
w4uMX5mWAF4 | [Music] like all the engines components the crankcase also comes from Germany this foundry and phone bag in Bavaria is the birthplace of the mega diesel engine and a location with a long tradition a small smithy existed here way back in the 15th century so hot iron has been molded in phone bag for nearly 600 years today the foundries three smelting furnaces are operating at full speed to | 225 | 261 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=225s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | cast a series 8000 crankcase for 10 hours now the steel workers have been feeding the voracious furnaces different materials the materials we need for the series 8000 are steel scrap pig iron and deep drawn sheet metal we also need electrode graphite and silicon carbide the composition is calculated by our superiors in this case by the engineers in our production planning department | 261 | 302 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=261s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | casting a crankcase calls for 16 tons of material hot hard work for the smelters who have to keep a constant eye on the temperature only when the molten metal has reached a temperature of 1500 degrees is it ready to be transported to the mold here we have a measuring sleeve made of press board inserted at the front here is a thermal element it's attached to a measuring probe and used | 302 | 330 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=302s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | to measure the temperature of the melt every steelworks has its own recipe time and again the smelters add this or that material the better the composition of the smelt the harder and more durable the crankcase will be from time to time the smelt is checked in a modern foundry a sample of the molten metal is poured into a crucible containing a small measuring sleeve | 330 | 363 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=330s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | which in a matter of seconds transmits the temperature profile to a computer in the office the smelt has the perfect composition when the sample cools down in a certain way and then heats up again the enormous heat is no longer generated with fire but with electricity the principle is similar to the way an induction cooker functions in a domestic kitchen the big | 363 | 391 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=363s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | difference is that the three electric induction furnaces in the foundry have the power of five thousand microwave ovens [Music] therefore megawatt have heated the molten metal to a temperature of over 1500 degrees 200 meters away the mold is already waiting speed is now essential the steel workers transfer the molten mass the final ingredient magnesium is added via chutes the bubbling sound you | 391 | 427 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=391s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | can hear stems partly from the magnesium at temperatures of over 1500 degrees magnesium vaporizes much faster and that's what causes the bubbling sound the magnesium vapour flows through the molten metal like carbon dioxide through mineral water this changes the molecular lattice structure of the steel and will make the crankcase slightly elastic [Music] the 19 tons of molten mass now flow into | 427 | 464 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=427s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | two huge casting ladles there would be no point in having more than two because the crankcase mold has only two intake funnels [Music] this is what the various parts of a crankcase mold look like these two discourse consist of resin soaked quartz and which after setting has become rock-hard ten of these cores and sequence comprised the mold of a series 8000 crankcase prior to casting each | 464 | 506 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=464s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | template is given a coating which has a horrific smell to it the coating prevents the sand from mixing with the steel during casting the molten steel flows into the mold via this channel it passes through the filter chamber with its ceramic filter and enters the mold cavity via this feed channel and then spreads throughout the entire mold but before that the ten disk cores are | 506 | 538 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=506s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | placed in a casting box the cavities are filled with special sand without this sand parts of the mold would fly off during casting it's a job which calls for a lot of experience any mistake could render the mold useless all this takes place days before the actual casting which also demands total precision the clock is ticking the molten mass is cooling by the minute | 538 | 580 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=538s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | so the smelters have to check its temperature time and again on no account must have dropped below 1,400 degrees then the mass would no longer be suitable for casting a huge overhead gantry transports the cauldrons to the mold the big moment is close the birth of a mega diesel engine the two casting ladles are positioned over the to filling funnels from now on | 580 | 616 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=580s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | everything will have to take place with absolute synchronicity the head smelter starts the countdown three two one go in a fascinating spectacle the molten metal flows into the two funnels for the moment the two plugs are still in place because the mass first has to settle once again the command to remove the two plugs is given by the head smelter now pull the mass can now flow in it takes | 616 | 652 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=616s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | 70 seconds for the 16 tons of molten metal to flood the mold and fill every cavity completely the head smelter closely monitors the entire process giving instructions to his colleagues controlling the casting ladles a little bit faster faster although speed is of the essence all movements have to take place simultaneously otherwise swirls could form in the funnels | 652 | 678 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=652s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | now after a good minute the job is done within a few hours the metal cast in the mold will cool by several hundred degrees but it will be two weeks before the men can peel the crankcase from its mold only then will it be hard and elastic enough and extremely durable LaShonda la Valette is surging through the Mediterranean at a rate of over 40 knots the high speed ferry is heading | 678 | 716 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=678s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | for the Sicilian port of Port Salut it's not a propeller that the four mega diesel engines in its hull are driving but water jet power units which function on the recoil principle water is sucked in under the ship and then expelled again with tremendous force the engine on this vessel pumps out 9.1 megawatts of power at eleven hundred and fifty rpm the the aggregate power is | 716 | 753 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=716s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | 36.4 megawatts so in actual fact losing an engine will not affect the the vessel drastically the immense power from the diesel engines is a big help especially in berthing the 1500 ton ferry the ship is highly maneuverable and can be steered easily even in a confined space the captain slowly brings the 107 meter long jean de la Villette against the key wall in sicily | 753 | 793 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=753s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | in just eight hours time the catamaran will be heading back to Malta that's not a long time because today a team of mechanics specialists in marine engines has come on board one of the four mega diesel engines needs two new cylinders and the old ones require maintenance the men have to dismantle the diesel engine and replace the cylinders since a stay in Port is | 793 | 820 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=793s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | very expensive the specialists need to get to work straight away this means heading down to levels awaiting the men at a temperature of 50 degrees in the engine room are a booming auxiliary power unit and the 48 ton diesel engine they all know that this means a lot of work under time pressure brakes are out of the question back at the foundry and phone back two | 820 | 847 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=820s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | weeks have now passed that is how long the steel block has taken to cool down completely the heavy and in so far as steel permits elastic crankcase for the mega diesel engine is about to see daylight for the first time with the help of the overhead gantry the 16 ton Colossus is lifted out of the casting pit this causes the courts and cocoon to crumble exposing | 847 | 875 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=847s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | the brand-new series 8000 crankcase what we now see here is the down sprue and the path taken by the steel into the mold the first task now falls to a welder who has to sever the two down sprues the gas jet slowly cuts its way through the tubes which are as thick as tank Armour other superfluous parts are also still attached to the seven meter long cast body they were needed for the casting | 875 | 906 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=875s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | process now they too are cut off [Music] there's another four to higher up and to lower down then we'll tear everything down and it will remain standing in the middle the experienced welder burns his way along the crankcase bit by bit after an hour the block is fully exposed the casting channel can be removed but the material that has been cut off is by no means scrap it will be needed | 906 | 946 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=906s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | for the next melt the overhead gantry then comes into action again it lifts the block to the next station a huge mechanical vibrator the deafeningly loud vibrations cause any remaining quartz sand to fall off it too will be recycled after being cleaned the sand will be used to produce the next casting three minutes later the mega diesel crankcase is roughly clean | 946 | 984 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=946s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | it's next stop is the shot blasting chamber where the crankcase will be bombarded with a storm of tiny steel pellets [Music] these are the steel pellets they're made of ordinary steel and have a maximum diameter of 2.5 millimeters so we can roughly estimate what the surface will look like afterwards and how clean it will be millions of the steel pellets are fired | 984 | 1,019 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=984s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | to the chamber at a speed of 200 kilometers an hour this not only cleans the surface of the component the bombardment makes the steel harder and more corrosion resistant the process takes an hour then the doors are opened and with the help of a crane the men remove a perfectly cleaned engine block from the shot blasting chamber the razor-sharp casting noses also have | 1,019 | 1,048 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1019s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | to be cut off the crankcase can then leave its birthplace for transportation to Lake Constance Assembly of the mega engines takes place at the NTU plant in fleet lease often the firm specializes in large high speed diesel engines ships submarines military vehicles and locomotives worldwide are powered by MTU systems [Music] a series 8000 naval engine has to pass | 1,048 | 1,083 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1048s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | through six assembly stations twenty-five of these mega diesel engines leave the plant every year prior to assembly the raw part is milled the Colossus is machined to the right dimensions in several stages losing up to a ton of material in the process this takes several days engines of this size are machined with extreme precision the tolerances to be adhere to are so | 1,083 | 1,117 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1083s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | minut that they can no longer be perceived with the naked eye Lonnegan now we're talking about an accuracy of three or four hundredths of a millimeter such dimensions pose quite a challenge in other words a component the size of a small bus must not deviate from the ideal by one hundredth of the width of a human hair to check this the Colossus is placed on Europe's biggest | 1,117 | 1,146 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1117s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | measuring table Engineers measure every opening every drilled hole indeed every square millimeter to ensure that no disaster can occur when the engine is in operation after two weeks the crankcase is ready now main assembly can get underway over the next five weeks these 35 fitters will turn the barre crankcase into an extra extra-large mega diesel engine the overhead gantry transports | 1,146 | 1,177 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1146s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | the 10-ton parts of the rotary station where it is positioned with millimeter accuracy during this process the entire area is sealed off little towards you now got it it's in [Music] first of all the crankcase is given a serial number in the past this had to be hammered in with effort now a special tool performs the task mechanically in seconds the green light for assembly is | 1,177 | 1,212 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1177s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | about to be given by Foreman : ooh huh he is in charge of the workshop but first the fitters check the surfaces and the bearings once again large axis will illuminate the entire crankcase starting with the inlets and then continue with the main oil channels the two fitters job is to detect any contamination tiny burrs or metal splinters in one of the channels could cause serious problems | 1,212 | 1,242 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1212s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | later the main oil channel here has to remain free of dirt dust and splinters which could of course destroy the engine then it is the turn of the camshaft components when it is fully assembled the shaft will be 6 meters long and weigh 400 kilograms to ensure that everything fits together the mechanics work with liquid nitrogen they sink dozens of small guide pins in a nitrogen | 1,242 | 1,273 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1242s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | bath with a temperature of minus 198 degrees Celsius the liquid gas chills the metal pins and makes them contract the super-cold guide pins can be tapped into the flange of the camshaft segment with ease as they heat up they expand to give a really firm fit guide connections have to be greased and running surfaces oiled the men then push the camshaft into the 6 metre long channel section by | 1,273 | 1,303 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1273s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | section making sure nothing gets tilted a bit lower okay the next babies like then you'll see it coming down a bit more the initial phase is completed the guide neck is now in the channel the men slowly push it in further once again this is precision work there is ZERO room for error should something tilt the engine would be blocked up again optimal just hold it like that when the three | 1,303 | 1,343 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1303s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | segments have been bolted together the two fitters carefully push the unwieldy component through the engine the camshaft is made of surface hardened steel and will not be replaced throughout the entire life of the engine after two days the work at station 1 is completed one of the 25 mega diesel engines manufactured here each year is transported to the next station by | 1,343 | 1,370 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1343s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | overhead gantry the rotary station is even bigger than the first station here fitters will turn and wheel the Colossus several times and even turn it upside down the crankcase is the biggest component of the mega diesel engine now the second biggest is added the gigantic crankshaft six meters long and weighing six thousand kilograms it is the crucial element at the heart | 1,370 | 1,404 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1370s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | of the engine [Music] operating at full speed the heavy crankshaft will rotate at a staggering twenty revolutions per second [Music] for installation of the crankshaft the engine has to be turned upside down the fitters wheel the cage suspended from the overhead gantry the huge chef now moves towards the crankcase once again every millimeter counts very slowly six tons of high-grade metal are | 1,404 | 1,446 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1404s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | approaching the interior of the engine if the component were to slough the irreparable damage would be caused [Music] after 20 minutes the difficult task is completed the fitters now turn the huge frame a few more degrees to gain better access to the engines inlets over the next few hours they will install 20 of these cylinder Pistons later the entire combustion process will take place in | 1,446 | 1,475 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1446s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | the power units as they are known each power unit has a capacity of 17.5 litres and is basically an independent single cylinder engine the workshop also contains the pre assembly site for the power units before assembly of the cylinders can get underway the huge connecting rods have to be measured this includes measuring the bearing shells because if the bearing | 1,475 | 1,509 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1475s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | shells are too small this could damage the crankshaft all the measurements are recorded exactly to ensure precise positioning then the war can begin the fitters first prepare the Pistons each of which has a diameter of 27 centimeters weighing 100 kilograms each con rod can only be moved with a crane the con rod is carefully lowered into the piston the retaining bolt is | 1,509 | 1,543 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1509s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | then slid into place it takes a quarter of an hour to install the first of 20 Pistons next the focus is on the complex cylinder head on the rotary table the fitter inserts four bolts and secures the cylinder liner with another 24 bolts to guarantee precision they are tightened automatically by a machine the process is fully automated and monitored to ensure that I haven't forgotten the | 1,543 | 1,581 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1543s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | bolt and that every bolt has the right torque the computer determines the next operation and records every action by the fitter now the piston together with the con rod is introduced carefully and slowly into the cylinder a single error would cause considerable damage later 20 of these power units will make the 16 crankshaft rotate at a speed of 1,150 revolutions a | 1,581 | 1,615 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1581s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | minute a final components and assembly will be complete this is part of the exhaust the power unit weighs 750 kilograms in future it will have to withstand a great deal the ignition phase forces the piston downwards turning vertical motion into the circular motion of the crankshaft the crankcase is turned once more and again the overhead gantry comes into action as it brings up the power unit | 1,615 | 1,662 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1615s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | [Music] the men slowly lower the cylinder unit into the engine in its interior the connecting rod grips the crankshaft with millimeter accuracy the team installed 20 power units in one day the con rods are provisionally secured with white dummies because the engine will be turned once again and nothing must be allowed to shift its position the fitters reposition the engine block | 1,662 | 1,693 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1662s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | in order to install the 20 bearing shells in its underside the shell weighs 25 kilograms and is pushed on to the bolts of a con rod later it is this area that will have to withstand the greatest forces the up and down motion of the piston causes the crank shaft to rotate 20 times a second the forces involved are extreme and all the components will have to withstand | 1,693 | 1,721 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1693s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | them for many years a special procedure is followed to secure the con rod the men equipped the bolt with a hydraulic clamping cylinder they then attached oil pressure lines [Music] the hydraulic system forces the bolt apart at a pressure of 1,600 bar now the nut can be screwed on and the pressure reduced again the threads of bolt and nut are pulled together in a | 1,721 | 1,755 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1721s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | solid link installation of the power units is now finished along with the preliminary work on the fuel lines and the exhaust and cooling systems the gantry transports the engine block on to station 3 where a two-man team focus on the gear train here it is about to be sealed with a cover but beforehand the main coat the edges with a special sealing compound [Music] | 1,755 | 1,791 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1755s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | weighing 200 kilograms the cover is now attached it is secured with dozens of bolts in the years ahead the gear train will not be opened again depending on its application the mega diesel engine will have a service life of up to 35 years only then will maintenance be required back to the Mediterranean and put Salah Harbor on Sicily where the high speed ferry jean de la Villette is | 1,791 | 1,821 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1791s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | birthed three levels below deck a team is working against the clock the men have eight hours in which to replace two power units from one of the four diesel engines the maintenance work can only be carried out by specialists while the covering is being removed at the top one of the men crawls under the still warm engine to drain the cooling liquid he then opens the heavy covers to gain | 1,821 | 1,849 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1821s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | access to the interior of the engine above him two mechanics are loosening the bolts on the cylinder unit so far everything is going according to plan a crucial moment the power unit has to be taken out the fitter has to open the eye of the connecting rod which encloses the crankshaft the nuts can only be loosened with a hydraulic bolt tensioning cylinder now pressure of up | 1,849 | 1,879 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1849s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | to 1,600 bars applied through hoses to ensure that all the bolts are loosened the four main bolts on the upper side of the power unit are also loosened with the help of the hydraulic system finally the power unit is free using nothing more than a pulley and their own strength the men maneuver the power unit out of the crankcase centimeter by centimeter 750 kilograms make their way | 1,879 | 1,906 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1879s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | upwards working at a temperature of 50 degrees Celsius the men now all the unit through the engine room until it is under the service hatch where the hook from the small truck mounted crane on deck is already waiting after three hours the first power unit is taken aloft care is still vital because the component is by no means scrapped it will be given a complete overhaul and at | 1,906 | 1,933 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1906s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | some time or other be installed in another series 8000 mega diesel engine today the part is first placed in a special transport frame but why did it actually need to be replaced it is suspected that because of minut cracks in the cylinder head cooling water was able to get into the combustion chamber but only examination under a microscope will provide exact | 1,933 | 1,957 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1933s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | information in flicks half and on lake constance mt you technicians have made good progress the mega diesel engine is now being fitted with a turbocharger group a complex component the supercharger group gives the engine it's impressive height of 3 meters 50 comprised of several thousand separate parts the turbochargers are responsible for a huge increase in the performance | 1,957 | 1,989 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1957s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | of the marine diesel engine every year fitter Tobias Haider assembles 25 such turbochargers for series 8000 engines the purpose of the turbocharger is to increase the oxygen content of the combustion chamber this is the intake for the exhaust gases here we have the blade wheel which can rotate here exhaust gases flow out again and on this side drive the blade wheel this is where | 1,989 | 2,021 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=1989s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | the air is then drawn in here it is compressed and here it enters the intercooler 40,000 revs per minute and the boost pressure the four and a half bar compared with two and a half to 3 bar for a car tire lyta needs about a week to assemble the two-ton turbocharger today he's sealing the housing airtight to prevent any toxic exhaust fumes getting into the machine room later | 2,021 | 2,054 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2021s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | the turbocharger group is then transported by overhead gantry to station five now the turbocharger can be attached to the engine block two men connect apart with the exhaust circuit the series 8000 mega diesel engine now weighs around 40 tons the clutches then flange mounted the fitters maneuver the huge part to the end of the crankshaft and once again they need special tools the 15 this is | 2,054 | 2,089 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2054s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | the cylinder with which the clutch flange will later be pushed to the back [Music] here to the components have to expand hoses ensure a high oil pressure of 1500 bar [Music] the flange expands and little by little the clutch moves on to the shaft two minutes later the men release the pressure again the connection is solid the second part of the clutch is now | 2,089 | 2,130 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2089s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | bolted on above all the giant torque damper is designed to prevent the clutch breaking off when the mega diesel engine enters operation once again in fleet lease often it's a case of ready for takeoff then the overhead gantry transports the massive engine through the workshop it will now be lowered on to the mega diesel engines oil pan the 40-ton Colossus is placed securely on six | 2,130 | 2,163 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2130s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | stilts the oil pan is filled with two-thirds of maximum capacity that's 1600 liters which is the volume pumped through the engine twice every minute with total precision a hydraulic hoist raises the sump to be bolted on to more in the middle should be fine the fleet leaks off an engine plant all the tasks for the day have been completed but on Sicily there is still a | 2,163 | 2,201 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2163s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | lot to be done the high speed ferry jean de la Villette is still birthed at the key side the maintenance team on board the catamaran have got a tough job in their hands to power units need to be replaced and the men now have only six hours to install them the replacement unit which has been given a complete overhaul is lowered into the machine room through the | 2,201 | 2,228 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2201s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | service hatch the seven-man team are all specialists who have been specifically trained for this engine series slowly they lower the 750 kilogram part in the crankcase tough manual work with the help of a pulley and the confines of the machine room there is no space for an automatic ceiling crane the con rod cover then makes its descent since it weighs only 25 kilograms it is no problem for the | 2,228 | 2,265 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2228s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | mechanics skillful hands easily slip the cover on to the threaded bolts to nuts and the job is done the team don't talk much each man knows what he has to do only in this way will they be able to meet their deadline the next step is to get the injector ready it has to be cleaned greased and have new seals fitted on the cylinder head the tolerance of the rocker arms and the | 2,265 | 2,293 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2265s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | valves also has to be reset each feeler gauge has a specific thickness enabling the mechanic to adjust the valve clearance exactly [Music] the cover is put on and the men have reached the halfway stage the first of the two power units has been replaced the teams still have four hours for the repeat procedure removing the cylinder unit lifting it on deck with the crane | 2,293 | 2,320 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2293s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | and packing it safely for transport the new power unit is then lowered into the machine room installed bolted greased and adjusted all the men can do now is hope that the engine will spring to life immediately the fitters are still working but the ship's crew are already closing the maintenance hatch the first trucks will soon be driven on board everything is | 2,320 | 2,350 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2320s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | still going to plan but will the overhauled engines start up [Music] at MTU on lake constance the new engine block is again being transported by crane through the workshop in the meantime the mega diesel engine has become even heavier just before its final assembly station it now weighs nearly 48 tons at station six the fitters focus on the electronic system | 2,350 | 2,383 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2350s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | and on pumps and lines of all kinds the series 8,000 marine diesel engine is a complex structure of circulation lines for fuel oil air and exhaust fumes several hundred meters of copper pipes tubes cables and hoses have been installed in and on the engine two thousand liters of diesel fuel per hour and hundreds of cubic meters of air in exhaust gases along with three thousand | 2,383 | 2,416 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2383s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | liters of oil every minute will flow through the engine all the lines are special home and custom-made products like the pipe for the sea water cooling system the fitter assembles the separate elements of the coiled pipe in a gauge anything that's slightly out is ground to size so that it fits with millimeter precision [Music] this is I this site needs to fit now it | 2,416 | 2,450 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2416s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | fits first of all a welder joins the various sections loosely together they're made of a very special material it's a cute print achill ferrous alloy the ship's engine is exposed to salt water but that can't affect this pipe welding curved sections while the workpiece is turning is a big challenge for any welder the seam has to be absolutely watertight if any sea water | 2,450 | 2,481 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2450s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | got into the engine it would destroy it the final pipe for the engine block is now ready it has been a long road over the last five weeks around 20,000 parts have been attached to the crankcase the result is an extra-large marine diesel engine made in Germany once again the team of 35 fitters has done a great job but one thing is still missing the test run no engine leaves | 2,481 | 2,519 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2481s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | the plant without having been tested there are 46 test benches here and our mega diesel engine from series 8000 is placed on the biggest we start up the engine with an air starter that operates with 40 bar it drives the flywheel which causes the engine to start up before it started immortal finally the big moment comes the mega diesel engine springs to life for the first time at the control | 2,519 | 2,554 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2519s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | console hold on Luthor and a colleague increased the speed the engine's performance is measured with the help of a water break attached to its transmission the water break has a paddle wheel which rotates in the water creating an artificial resistance [Music] after half an hour it is clear that the engine has passed the test it functions flawlessly in the hull of the Jean de la Villette | 2,554 | 2,596 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2554s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | ferry still birthed in Sicily another diesel engine of the same type still has to pass its test a team of fitters had just eight hours in which to replace the heart of the engine the two power units with cars and trucks now queued up in front of the ferries loading ramp the engine just has to start up otherwise well that doesn't bear thinking about no way but in fact the engine won't start so | 2,596 | 2,636 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2596s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | the fitters have to check all the lines and try again [Applause] success the engine is running again and to the ears of the fitters the deafening noise sounds like music the pitstop has taken 8 hours and cost thousands of euros but the high speed ferry is now ready once again to make the crossing to Malta the ship's engineer just has to give the green light then the team of | 2,636 | 2,675 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2636s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | fitters can call it a day the diesel engine can now look forward to a long service life these engines run virtually forever and ever under typical conditions we're talking about 70 mm to operating hours after that the engines are taken out and checked for wear and if everything is okay they are reassembled and put back into service it's already dark when the Jean de la | 2,675 | 2,708 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2675s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | Villette reaches malta its engine is working perfectly after performing a final skillful turn in the narrow Basin the captain reverses the ship alongside the key [Music] the high-speed catamaran will again be able to cross the Mediterranean three times a day taking cars and trucks boots and tourists for Malta to Sicily and back in record time and reliably thanks | 2,708 | 2,736 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2708s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | to four mega diesel engines in its hull power made in Germany [Music] by lake constance the brand new engine has passed its test with flying colors now the 7 meter long Colossus is heading for the wash unit the biggest of its kind far and wide you have molecules every large engine is washed here on average the procedure takes five hours at a temperature of 70 | 2,736 | 2,775 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2736s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | degrees the engine is washed with the detergent and then dried for paint spraying it's a really tough job clad in a heavy protective suit the man with the high-pressure cleaner has to cope with heat noise and damp after five hours the engine is spotless above all it is free from grease essential if it is to be sprayed later with a special type of paint the roughly one thousand cubic meters of | 2,775 | 2,810 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2775s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | water that are used will be treated and recycled [Music] prior to paint spraying parts of the engine are masked the sensitive cables and pipes must be kept free of the paint which could change their thermal and electrical properties finally the engine has given its coat this too is a process that takes time the Motown big slice we apply two coats first a primer then it's left to dry for | 2,810 | 2,854 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2810s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | about four hours then we apply a thick coat which also takes about four hours to dry it's a lot of work for the two paint sprayers who go through 200 leaders of paints including drying time the mega diesel engines spend 16 hours in the cabin now it is ready the colossus took five weeks to manufacture and will power a vessel for several years the series 8000 mega diesel engine has a capacity of 350 | 2,854 | 2,889 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2854s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
w4uMX5mWAF4 | liters and an output of thirteen thousand six hundred horsepower total cost the lower end of a scale between 1 and 10 million euros well packed the engine is ready for delivery worldwide for up to 35 years it will operate maintenance-free as a marine diesel engine or as an emergency generator in a nuclear power station or an industrial facility manufacturing an extra large | 2,889 | 2,916 | https://www.youtube.com/watch?v=w4uMX5mWAF4&t=2889s | Exceptional Engineering | Mega Diesel Engine | Free Documentary | |
zoa2pKYp_fk | well active learning is the idea that students to really learn something to really understand something have to be actively involved and that just sitting passively and listening to a lecture really doesn't help students develop the higher order cognitive processes that they need to really really understand something so you can listen to something you can watch a movie you can watch TV | 0 | 29 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=0s | Active Learning Overview | |
zoa2pKYp_fk | and you can generally get the plot but if you're asked to to recall specific details or to to even explain a particular nuance associated with the TV show or movie you can't really do it and that's what happens often in the lecture is that students will sit in the lecture though write down what's being said but they're not really engaged with the material so active learning is this idea | 29 | 54 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=29s | Active Learning Overview | |
zoa2pKYp_fk | of people say minds on always hands-on sometimes those students have to to be actively with their mind thinking about the material applying what's being said and given opportunities within the lecture to apply what's being taught or what's being the topic at hand and then active learning strictly speaking means that you just you're just one a particular individual | 54 | 81 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=54s | Active Learning Overview | |
zoa2pKYp_fk | is active interactive we tend to parse that a little bit and say interactive learning would mean the student has been active in his or her own mind in thinking about the material but then is also interacting with others peers or potentially the faculty member or TA in order to to further develop understanding construct meaning for for the topic I always start maybe the | 81 | 106 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=81s | Active Learning Overview | |
zoa2pKYp_fk | second session of the class the second class meeting is a discussion of what we know about how people learn so a discussion of the literature and the research on human cognition and learning and and if you take a constructivist point of view or constructionist point of view which really says that as I said before to understand people have to make meaning of a topic they have to | 106 | 131 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=106s | Active Learning Overview | |
zoa2pKYp_fk | construct their own meaning and we show the research that really shows that this is true for a higher level of processes people have to be actively engaged and there's research to show that we also show the classroom based research so Freeman's 2014 paper that was a meta-analysis of 225 other studies that showed that in courses in college-level courses with we're active | 131 | 159 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=131s | Active Learning Overview | |
zoa2pKYp_fk | learning was used there was a 12% decrease in the failure rate and they normalized it to all of the important factors that they should be normalized to the experience of the instructor the size of the class the type of the institution the the situation the way the position that the class is situated within the larger curriculum and and across the board it was shown that there | 159 | 181 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=159s | Active Learning Overview | |
zoa2pKYp_fk | was a 12% decrease on average of the failure rate and they make a comment in the paper that if that had been a clinical trial of a drug and 12% of the people on the drug head showed marked improvement they would have had to stop the trial and and give everyone the drug so this idea that there's a 12% decrease in the failure rate in courses that use active learning to me is pretty | 181 | 206 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=181s | Active Learning Overview | |
zoa2pKYp_fk | compelling that we should all be using active learning so whenever possible because we have an MIT our students our MIT students we use data we use the research and we we try to find really good research solid research that shows the the way people learn and then how to support that with specific Act classroom practices so many of the students haven't had the experience of being in a | 206 | 231 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=206s | Active Learning Overview | |
zoa2pKYp_fk | class where active learning was used so they don't really understand it so when we start to talk about it as a way of teaching they may not really get it so throughout the course from the first the first class all the way through we I try to use several different types of active learning exercises each class so the students themselves are actively engaged with the material from the first day so | 231 | 254 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=231s | Active Learning Overview | |
zoa2pKYp_fk | I may have them break into pairs and discuss a particular topic or identify something they didn't they didn't understand from the pre class readings and then after three minutes week they can either share their comments with someone else or maybe we just report out to the larger group that that if they just report if they just write down and then report back that's a pretty good | 254 | 275 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=254s | Active Learning Overview | |
zoa2pKYp_fk | example of active learning it's a pretty simple it's what what you might call low-hanging fruit in terms of what it would take what it takes for a faculty member to do that so I'll do that I'll have them do that and then I step back and say okay why did I ask you to think about it why did I ask you to take three minutes before we had this discussion so I try to deconstruct the exercise for | 275 | 295 | https://www.youtube.com/watch?v=zoa2pKYp_fk&t=275s | Active Learning Overview | |
NTz4rJS9BAI | I just feel I feel the Ludvig has young legs that's all set anyway great to see everyone right so where to begin so this is this is joint work with a bunch of awesome people and I think really pushing on a lot of really interesting empirical work and I think I'm not gonna say that the talk will be uncontroversial so if I say a thing that makes you angry that's for me and if you | 0 | 39 | https://www.youtube.com/watch?v=NTz4rJS9BAI&t=0s | Training on the Test Set and Other Heresies | |
NTz4rJS9BAI | say anything that's like well that's awesome that's from one of these fours alright so I know this is works up on deep learning I'd like to start with machine learning that's why I talk about machine learning and I want to talk about kind of the conventional wisdom that we give to our undergraduates Jonathan here teaches hundreds of them and so I hope I don't know how many of | 39 | 61 | https://www.youtube.com/watch?v=NTz4rJS9BAI&t=39s | Training on the Test Set and Other Heresies | |
NTz4rJS9BAI | these things you tell them one they're like some how to have a good predictor you have to balance bias and variance alright and that you really should not perfectly fit your training data that's a no-no t something we definitely teach them that in right yeah you have to oh he already knows you don't the punch line this is the sad part and we know that high capacity models right wouldn't | 61 | 83 | https://www.youtube.com/watch?v=NTz4rJS9BAI&t=61s | Training on the Test Set and Other Heresies | |
NTz4rJS9BAI | have really big ones shouldn't generalize that you got to keep them small because if you you know said on the first day trying to do one-dimensional polynomial regression right and optimize high precision non convex optimization that's hard and I think everybody in this room at this point knows that none of these are true right it's a it's weird right so we keep | 83 | 103 | https://www.youtube.com/watch?v=NTz4rJS9BAI&t=83s | Training on the Test Set and Other Heresies | |
NTz4rJS9BAI | all kind of come to the terms that none of these things are true and yet we teach in our undergraduate classes I'm trying it's really hard to teach them anything else to be honest nuance is really difficult at the undergraduate level especially when there are 700 of them so I think that's a kind of complicated thing but it is this weird thing that we're in the square in this | 103 | 121 | https://www.youtube.com/watch?v=NTz4rJS9BAI&t=103s | Training on the Test Set and Other Heresies | |
NTz4rJS9BAI | weird regime where everybody here knows that none of these are true so how I want to push in a little bit on some other things that we tell people that also maybe aren't true kind of in this talk just in case you you don't believe me what are we okay first of all what do I mean by machine learning I mean something very narrow right for me when I say machine learning yes I would | 121 | 140 | https://www.youtube.com/watch?v=NTz4rJS9BAI&t=121s | Training on the Test Set and Other Heresies | |
NTz4rJS9BAI | upset some of my colleagues nobly Mike Jordan but I assess on my college might say this is all machine learning is it's just predict making predictions from examples I have a set of something I have a set of something else and I want to find prediction functions that map X to Y I know there's more than that but this is the backbone this is why all of you are here this is why they're | 140 | 158 | https://www.youtube.com/watch?v=NTz4rJS9BAI&t=140s | Training on the Test Set and Other Heresies | |
NTz4rJS9BAI | building our semester than this and so the whole idea is that how do we actually estimate these things we ask to make them from data we collect as many training data points as we can we ask them ate them from data and then we just hope that this works on other data a big hope big hope is that we have a lot of data if we collect enough of it we get all edge cases we can drive our cars | 158 | 181 | https://www.youtube.com/watch?v=NTz4rJS9BAI&t=158s | Training on the Test Set and Other Heresies |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.