基于弹性支撑与放大的宽频压电振动能量采集器模型与实验研究

针对刚性支撑压电振动能量采集器工作频带窄、采集效率低等问题,提出了一种基于弹性支撑与放大的宽频压电振动能量采集器.利用有限元方法建立了宽频压电振动能量采集器的机电耦合模型,通过Ansys软件仿真分析了能量采集器结构参数对其频域输出特性的影响;根据力学和电学平衡方法建立了宽频压电振动能量采集器的集总参数机电耦合运动微分方程,利用4-5阶龙格库塔算法对方程进行了时域求解,仿真分析了能量采集器在不同结构参数下的振动位移、速度、输出电压和功率等性能.研制了弹性支撑和放大的宽频压电振动能量采集器原理样机,建立了样机系统实验平台,并对理论研究结果进行了实验验证,结果表明本文所提的宽频压电振动能量采集器具有工作频带宽、输出性能高等优点,适合为微电子器件进行供电.

Model and Experimental Researches of a Broadband Piezoelectric Vibration Energy Harvester with an Elastic Support and Magnifier

The piezoelectric vibration energy harvester with rigid support(RS-PVEH)has some disadvantages of nar-row operating band and low harvesting efficiency. In order to solve these issues,this article presents a broadband piezoelectric vibration energy harvester with an elastic support and magnifier(ES-PVEH). The electromechanical coupling model of the ES-PVEH was established with finite element method,the effects of the structure parameters on the output performances in frequency domain were numerically analyzed. The lumped parameter governing equa-tions(LPGE)of the ES-PVEH was consequently derived based on the mechanical balance and electrical balance principles,and the time responses,such as the displacement,the tip velocity,the harvesting voltage and the output power of the ES-PVEH,were obtained by solved the governing equations with 4-5 order Runge-Kutta algorithm. Finally,the ES-PVEH prototype was developed and the experimental setup was presented,some experiments were carried out to testify the validities of the theoretical models. The results show that the ES-PVEH can not only broaden the operating frequency bandwidth,but also improve the output performance.