摘要
设计了基于矩形梁和梯形梁两种结构的双端固支式压电俘能器,其较传统的悬臂梁式压电俘能器,具有更高的压电材料利用率,且应变分布更均匀,输出功率更高。针对这两种结构建立了理论模型并进行了分析。结果表明双端固支梯形梁应变更均匀。另外,针对这两种结构设计了对比试验,测量了输出电压及输出功率。这两种结构均可通过串联提高输出性能,与双端固支矩形梁相比,双端固支梯形梁的一阶固有频率降低,其串联输出电压较矩形梁提高22.9%,输出功率提高34.7%。
A double-end fixed beam piezoelectric energy harvester based on the rectangular beam or trapezoidal beam structure is designed.Compared with the conventional cantilever-beam piezoelectric energy harvester, the double-end fixed beam piezoelectric energy harvester has higher piezoelectric material utilization, more homogeneous strain distribution and higher output power.The theoretical model for these two kinds of structures is established and analyzed; the result shows that the strain distribution of the double-end fixed trapezoidal beam is more uniform than that of the double-end fixed rectangular beam. In addition, the contrast test is designed for these two kinds of structures and the output voltage and output power are measured. The output performance of these two kinds of structures can be improved by series. Compared with the double-end fixed rectangular beam, the first-order natural frequency of the double-end fixed trapezoidal beam is significantly lower and the series output voltage is 22.9% higher than that of the rectangular beam and the output power is increased by 34.7%.
作者
闫丽
高世桥
刘海鹏
张广义
YAN Li;GAO Shiqiao;LIU Haipeng;ZHANG Guangyi(State Key Lab.of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)
出处
《压电与声光》
CAS
CSCD
北大核心
2018年第3期370-373,378,共5页
Piezoelectrics & Acoustooptics
基金
国家"八六三"计划基金资助项目(SS2013AA041104)
关键词
双端固支式压电俘能器
理论模型
应变分布
输出性能
对比试验
double-end fixed beam piezoelectric energy harvester
theoretical model
strain distribution；output characteristic；contrast test
