摘要
由于非线性技术可使压电式能量采集获得较宽的振动频率和较高的输出电压,本文基于非线性振动研究了一种压电式能量采集器。基于Duffing模型测试得到了非线性压电能量采集器的振动方程,对其振动特性进行了仿真测试。在不同永磁体间距的条件下,测试了非线性压电式能量采集器的开路输出电压,结果表明,当激振台加速度为20m/s2时,该非线性压电式能量采集器的最大输出电压从线性系统输出时的131V提高到208V,最大输出功率为43.264mW,主共振频率变化范围达到18Hz。该Duffing模型的结构可以在小范围内改变非线性压电式能量采集器的共振频率,同时提高其输出电压。
As nonlinear technology allows piezoelectric energy harvesting to obtain a wider vibration frequency and a higher output voltage, this paper proposed a piezoelectric energy harvester based on nonlinear vibration. The oscillation equation of the piezoelectric energy harvester was obtained based on testing Dulling mode and its vibration charateristics were simulated. With the various sinusoidal excitation frequencies and different magnet spacings, the opened output voltage was measured. The results show that when the excitation acceleration is 20 m/s2 , the output voltage from the energy har- vester has been improved to 208 V from 131 V,its maximum output power is 43. 264 mV,and the res- onance frequency region can range up to 18 Hz. The Dulling model structure can change the resonant frequency of the nonlinear piezoelectric energy harvester in small scope, and can increase the output voltage.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2012年第12期2737-2743,共7页
Optics and Precision Engineering
基金
辽宁省教育厅科研突破计划资助项目(No.LS2010038)
关键词
非线性振动
压电式能量采集器
共振频率
激振测试
nonlinear vibration
piezoelectric energy harvester
resonance frequency
excitation test
