多层PVDF堆叠式压电悬臂梁功率输出特性分析

Power output characteristics analysis of multilayer PVDF stacked piezoelectric cantilever beam

针对低频激励下多层聚偏氟乙烯(PVDF)堆叠压电悬臂梁发电性能展开研究,以提高悬臂式压电俘能器输出性能。建立多层PVDF堆叠压电悬臂梁集中参数模型,分析不同层数堆叠对谐振频率的影响关系,运用COMSOL Multiphysics对多层PVDF堆叠压电悬臂梁进行仿真,讨论不同层数、不同布置方式、负载等参数对系统输出功率的影响规律,并进行试验验证。结果表明,多层PVDF并联堆叠能够有效提高压电俘能器输出功率,单侧堆叠3层PVDF时输出功率可达单层压电悬臂梁的2.9倍,双侧各1层时输出功率是单层压电悬臂梁的2.2倍,研究结果为压电俘能器优化设计及工程应用提供了理论依据。

Here,power generation performance of multilayer polyvinylidence fluoride(PVDF)stacked piezoelectric cantilever beam under low frequency excitation was studied to improve output performance of cantilever piezoelectric energy harvesting.The lumped-parameter model of multi-layer PVDF stacked piezoelectric cantilever beam was established to analyze effects of different layers on resonant frequency,the multi-layer PVDF stacked piezoelectric cantilever beam was simulated using the software COMSOL Multiphysics,and influence laws of layer number,layout mode,load and other parameters on output power of the system were explored,and tested for verification.The results showed that parallel stacking of multi-layer PVDF can effectively improve output power of piezoelectric energy harvesting;when 3 layers of PVDF are stacked on one side,the output power can reach 2.9 times that of single-layer piezoelectric cantilever beam,and when one layer is stacked on each one of both sides,the output power is 2.2 times that of single-layer piezoelectric cantilever beam;the study results can provide a theoretical basis for the optimal design and engineering application of piezoelectric energy harvesting.