摘要
单频悬臂梁式压电振动能量采集器存在工作频带窄、采集转换效率低等问题。通过在单频悬臂梁式压电振动能量采集器的水平悬臂梁末端增加一垂直悬臂梁,构造了一种L型宽频压电振动能量采集器;运用有限元法建立L型振动能量采集器的有限元分析模型,仿真分析了L型振动能量采集器的结构参数对其前两阶模态频率的影响,得到了结构最优尺寸。利用Hamilton原理建立了L型能量采集器的机电耦合分析模型,对其振动特性和电输出特性进行了数值仿真,结果表明L型结构能够提高能量采集器的工作频带和采集效率。
The cantilevered piezoelectric vibration energy harvester（CPVEH）has an important application in wireless sensor network nodes.However,the conversion efficiency of the CPVEH is low for its narrow-band frequency,which cannot match the main frequency of the environment vibration.In this article,an L-shaped broadband CPVEH was proposed to improve the energy conversion characteristics.The finite element method was used to establish the FE model,and the influences of various parameters on L-shaped broadband vibration energy harvester,such as operational modal,were analyzed by simulations through ANSYS software.The electromechanical model was established with the Hamilton principle;both the vibration and electrical performances were numerically studied.The research results have shown that the L-shaped structure can improve the operation bandwidth and the converting efficiency.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2016年第6期1010-1014,共5页
Journal of Materials Science and Engineering
关键词
L型
宽频
压电
能量采集器
L-shaped
broadband frequency
piezoelectric
energy harvester
