宽频随机激励下非线性压电能量采集器的相干共振  

Coherence resonance of nonlinear piezoelectric energy harvester under broadband random excitation

作　　者：李海涛[1] 秦卫阳[1] 

机构地区：[1]西北工业大学工程力学系,西安710072

出　　处：《物理学报》2014年第12期51-58,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11172234)资助的课题~~

摘　　要：近年来随着微机电系统的发展,非线性能量采集系统受到了研究者的极大关注.本文采用随机线性化方法对一类环境噪声作用下能量采集系统进行了分析.首先根据受压梁的双稳态特性,建立了等效的随机激励作用下压电能量采集系统的数学模型.采用随机线性化方法获得了输出电压近似闭合形式的表示,并且通过数值分析说明了系统相干共振现象.相干共振的相关研究可应用于优化系统参数使能量采集效果最大化.With the development of micro electromechanical systems, many researchers focus their attention on nonlinear energy harvesting device. The stochastic equivalent linearization method is used to analyze an energy harvesting system under ambient noise. First, according to the bistability of beam axially loaded, a model of bistable nonlinear vibration energy harvester under the stochastic condition is proposed. A close-form approximation expression for the ensemble average of harvested power is derived and the numerical simulation of the system shows stochastic resonance. The results show that it is possible to optimally design system such that the harvest power is maximized for a given density or variance of random excitation.

关 键 词：随机激励 能量采集系统 相干共振 

分 类 号：TM619[电气工程—电力系统及自动化]