Abstract: To solve self-power problem of wireless sensor network nodes, a broadband piezoelectric vibration energy harvester with an elastic supporter and amplifier was presented herein. Distributed parameter coupling electromechanical model of piezoelectric vibration energy harvester was established with Hamilton principle and Raleigh-Ritz method by considering the influences of cantilever tip mass. Effects of structural parameters (such as mass ratio, stiffness ratio, and damping ratio) on the vibration performance, the electric output performance of piezoelectric energy harvester were numerically analyzed. Prototype of piezoelectric energy harvester and experimental setup were developed. Some experiments were carried out to testify the validity of the proposed mathematical model. Research results show that the distributed parameter model may obtain higher precision than that of lumped parameter model.

Key words: piezoelectric energy harvester, two degrees of freedom, distributed parameter model, elastic amplifier, wide frequency band

摘要： 为解决无线传感网络节点自供电问题，提出了一种带有弹性支撑与放大的宽频压电振动能量采集器。利用Hamilton原理和Raleigh-Ritz方法，并考虑悬臂梁末端质量块的影响，建立了压电能量采集器的分布参数机电耦合模型；数值分析了能量采集器质量比、刚度比和阻尼比等参数对系统振动特性、输出特性的影响；研制了实验原理样机，搭建了实验测试平台，验证了数学模型的正确性。研究结果表明，分布参数模型比集总参数模型具有更高的预测精度。

关键词: 压电能量采集, 两自由度, 分布参数模型, 弹性放大器, 宽频带