垂向动磁式压电振动能量收集器建模及实验研究

Modelling and experimental study of vertical moving magnetic piezoelectricvibration energy harvester

该研究展示了一种垂向动磁式压电振动能量收集器,利用垂向磁铁的非线性力改善了单一悬臂梁的收集性能;为了对该结构进行设计分析与参数优化,建立了集总参数理论模型,利用仿真对多种模式进行了研究。聚焦于低频排斥模式,利用实验开展进一步研究;使用铝合金与压电纤维材料MFC搭建了实验平台,并验证了系统的能量收集性能。实验结果表明,该结构能够有效优化能量收集性能,且在误差允许范围内,数值仿真可有效预测结构性质;基于仿真及实验,对结构中的磁铁间距及磁感应强度参数进行研究并进行了最优化,在最优化参数下带宽可提高40.6%,峰值功率可提高42.7%。

In this paper,a vertical moving magnetic piezoelectric vibration energy harvester was presented.The performance of the single cantilever harvester was improved with the nonlinear force introduced by the vertical magnets.In order to carry out the analysis and parameter optimization of the structure,a lumped-parameter theoretical model was established,and various modes were studied via simulation.This paper focuses on the repulsive low-frequency mode,and future studies were carried out with experiments.An experimental platform was built with aluminum alloy and piezoelectric fiber material MFC,and the energy harvesting performance was verified.The experimental results show that the numerical simulation can effectively predict the performance within the error tolerance range,and the performance can be effectively improved by the structure.Based on simulations and experiments,the magnet spacing and magnetic flux density parameters were studied and optimized.Under the optimal parameters,the bandwidth can be increased by 40.6%and the peak power can be increased by 42.7%.