谐振式压电叠堆的高效换能结构研究

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (12) : 125-128.

论文

谐振式压电叠堆的高效换能结构研究

王兆强; 刘海利; 徐天柱; 陈加浪; 黄震宇

作者信息 +

Research on the efficient structure of oscillator piezoelectric stack

WANG Zhao-qiang, LIU Hai-li, XU Tian-zhu, CHEN Jia-lang, HUANG Zhen-yu

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文章历史 +

摘要

压电叠堆具有纵向机电耦合系数高、耐疲劳性强的特点，但在低频振动条件下，压电叠堆的机电转换效率低，从而限制了其在结构振动能量收集方面的应用。通过将谐振频率接近结构振动频率的谐振器附加在压电叠堆表面形成谐振式压电换能系统，可以有效提高谐振频率附近的机电能量转换效率。本文对谐振式压电换能结构进行参数建模，以压电叠堆所受纵向力与结构激励力的比值衡量谐振式压电叠堆的换能效率，确定系统有效换能频带的宽度与系统的结构设计参数的关系，从而给出谐振式压电换能系统参数优化设计方法。谐振式压电换能结构的实验表明谐振器能有效增加较低振动频率下的机电能量转换效率，提高输出的开路电压

Abstract

Piezoelectric stack has the advantages of high longitudinal electro-mechanical coupling coefficient and strong fatigue resistance, but its electro-mechanical conversion efficiency is not high under low frequency vibration, which limits its applications in vibration energy harvesting. A novel oscillator piezoelectric energy conversion system (OPECS) is presented to enhance conversion efficiency of OPECS nearby resonant frequency, through attaching an oscillator onto the surface of piezoelectric stack. The parameter model of the OPECS is built at first. According to the model electro-mechanical conversion efficiency is evaluated by ratio between longitudinal force and exciting force. Then the relationship between effective working bandwidth and structure parameters are ascertained, thus the design principles of structure parameters are given out. Experimental results show that OPESC can effectively increase the electro-mechanical conversion efficiency in low frequency vibration and enhance the output voltage of piezoelectric stack.

导出引用

王兆强;刘海利;徐天柱;陈加浪;黄震宇. 谐振式压电叠堆的高效换能结构研究[J]. 振动与冲击, 2011, 30(12): 125-128

WANG Zhao-qiang;LIU Hai-li;XU Tian-zhu;CHEN Jia-lang;HUANG Zhen-yu. Research on the efficient structure of oscillator piezoelectric stack
[J]. Journal of Vibration and Shock, 2011, 30(12): 125-128