Power output characteristics analysis of multilayer PVDF stacked piezoelectric cantilever beam
ZHANG Xuhui1,2, CHEN Luyang1, WANG Lin1, SHE Xiao1
1.School of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China;
2.Shaanxi Key Laboratory of Mine Electromechanical Equipment Intelligent Monitoring, Xi’an 710054, China
Abstract：The power generation performance of multi-layer PVDF stacked piezoelectric cantilever under low frequency excitation is studied in order to improve the output performance of piezoelectric cantilever. The lumped parameter model of multi-layer PVDF stacked piezoelectric cantilever is established, and the influence of different layers on resonant frequency is analyzed. The multi-layer PVDF stacked piezoelectric cantilever is simulated by COMSOL Multiphysics. The influence of different layers, different arrangement and load on the output power of the system is discussed and verified by experiments. The results show that the parallel stacking of multi-layer PVDF can effectively improve the output power of piezoelectric cantilever beam. The output power of unilateral stacking 3-layer PVDF is 2.9 times that of unilateral 1-layer piezoelectric cantilever. When one layer is arranged on each side, the output power is 2.2 times that of the unilateral one-layer piezoelectric cantilever. The research results provide a theoretical basis for the optimal design and engineering application of piezoelectric energy trappers.
Key words: Piezoelectric energy harvesting; PVDF stack; energy output; Impedance matching
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