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Piezoelectric Energy Harvester Adjusted by Light-Induced Actuator

Shape-memory polymer has two different effects, i.e. shape memory effect and variable stiffness effect. Significant Young’s modulus changes when an external stimulus is applied. Light-induced shape memory polymer exhibits great potential in application of actuators because of its reconfigurableness, adaptiveness and non-contact control. In this paper, a smart actuator based on light-induced shape memory polymer is applied to improve the output power of piezoelectric energy harvester. This energy harvester is a laminated beam structure which includes five layers. Two piezoelectric layers are attached on the upper and lower surfaces of substrate layer. Then two light-induced actuators are bonded on the piezoelectric layers to adjust the frequency of this laminated beam via variable stiffness effect. Output power of the energy harvester could be promoted after the light-induced actuation since the natural frequency approaching the excitation frequency.