带弹性放大器的双稳态压电振动能量采集器

针对带弹性放大器的双稳态压电振动能量采集器,利用Hamilton原理和Raleigh-Ritz方法建立了压电振动能量采集器的机电耦合分布参数模型.重点分析了激励频率Ω≥1时系统质量比、刚度比、磁铁对间距等参数对系统输出性能的影响.研制了压电振动能量采集器原理样机,搭建了实验测试平台,实验测试了压电振动能量采集器的输出性能.研究结果表明带弹性放大器的压电振动能量采集器是一个非线性双自由度系统,具有两个双稳态运动区域;在激励频率Ω≥1时压电振动能量采集器需要较大的激励能量才能进入大幅值周期振动状态.

A bistable piezoelectric vibration energy harvester with an elastic magnifier

Focusing on the BPEH(Bistable Piezoelectric vibration Energy Harvester)with an EM(Elastic Magnifier), the coupling electromechanical distributed parameter model was established with Hamilton principle and Raleigh-Ritz method. The effects of the mass ratio, stiffness ratio, and the distance of magnets on the output performance were extensively analyzed when the exciting frequency isΩ≥1. The prototype of the new BPEH and the experiment setup were developed,some experiments were carried out to exhibit the output performance. The results show that the new BPEH is a two-degree-of-freedom nonlinear system,which has two bistable motion regions. In the region of Ω≥1, it will oscillate in a large-amplitude high-energy orbit motion excited by large acceleration amplitude.