Design And Implementation Of A Dual Piezoelectric Cantilever Beam Vibration Energy Harvester

In recent years, with the rapid development of wireless sensor networks and low-power products, the supplement of energy has become increasingly prominent. Because of its pollution-free, strong sustainability and good environmental adaptability, the solution of energy harvesting technology has gradually attracted the attention of researchers in various fields.The collecting objects of energy harvesting technology includes vibration, solar, wind, thermal and some other energy sources. On account of unrestricted geographical or temporal, energy harvesting technology which based on vibration has a wide range of applications. At the same time, the implementations of vibration energy harvesting technology include piezoelectric, electromagnetic and electrostatic. The implementation of piezoelectric with high conversion efficiency and well MEMS technology integration becomes the subject of research. Due to the high efficiency conversion, simple and most used structure, piezoelectric cantilever beam will be the main functional structure in this paper. Meanwhile, in order to improve the output power of energy harvester, this project will double the piezoelectric layer.There are a variety of vibration energy in environment, the frequency of vibration also different. First,there determines what the environment energy harvester apply to and the frequency range is in this paper, and also determined what material will be used by comparing the advantages and disadvantages of various piezoelectric materials. Then, there establishes a single degree of freedom spring-mass system model and equivalent circuit of piezo energy harvester, analyzed the influence factors of energy harvester of its output power and used Simulink modeling to analyze the open circuit voltage of the frequency response of energy harvester system. After that, there tested the existing energy harvester, contrasting with the simulation results of the finite element modeling and simulation software COMSOL Multiphysics in order to verify the correctness of simulation modeling. Further more, using COMSOL Multiphysics to design piezoelectric cantilever beam energy harvester and determine the size of piezoelectric cantilever beam to get the best quality of its output. Finally, according to the simulation results manufactured a certain double size layer piezoelectric cantilever vibration energy harvester and set up experimental test platform to test the energy harvester.