Modeling and Experiment of a Vibration Piezoelectric Energy Harvester with Adjustable Axial Force
Aiming at the problems of narrow working bandwidth and low output power of traditional energy harvesters,a bistable vibration piezoelectric energy harvester with adjustable axial force was studied.The energy harvester connects the free ends of two piezoelectric cantilever beams into a beam through an additional mass,and controls the axial force through a micrometer adjust-er to make the system a bistable structure.The non-conservative Lagrangian equation is used to analyze the power generation of the piezoelectric energy harvester,and the electromechanical coupling model is established.The experimental prototype and plat-form were built using piezoelectric materials such as PZT5H to verify the energy capture characteristics of the system.The experi-mental research results show that the structural characteristics predicted by the simulation values are in good agreement with the experimental results.The structure can effectively expand the low-frequency power generation bandwidth,and the piezoelectric sweep frequency output has two obvious low-frequency peaks.Based on experiments to optimize the load parameters of the system,the peak voltage output of the bistable system can reach 17V.
Vibration Energy HarvesterDuffing Bistable OscillatorElectromechanical Coupling Modeling
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