摘要
提高能量采集系统的采集效率是一个课题难题。提出了含有压电及电磁效应的复合式能量采集系统,研究了其非线性动力学特性以及相干共振现象。首先建立了压电与电磁耦合的复合式能量采集系统模型,推导了其耦合方程。采用Runge-Kutta和Euler-Maruyama方法分析了压电式、电磁式以及复合式结构分别在确定性及随机激励作用下的动力学行为,并进行了实验验证。结果表明,同时考虑压电与电磁耦合的能量采集系统不仅在低频的大幅激励下具有高效的能量采集效果,而且在宽频随机激励下相干共振时的电压输出更高。此研究结果可应用于提高振动能量采集效率,优化电压输出。
Improving the energy harvesting efficiency is currently of topical interest. A novel hybrid energy harvester integrated with piezoelectric and electromagnetic effects was presented. The corresponding governing equations were derived and its nonlinear dynamics and coherence resonance were investigated. The dynamical behaviors of the hybrid energy harvester were explored by using the Runge-Kutta and Euler-Maruyama methods when it is subjected to deterministic and stochastic excitations. The experimental results show that the hybrid energy harvesting system,which combines the mechanisms of piezoelectric and electromagnetic effects,has a better scavenging performance when it reaches the state of coherence resonance. In addition,the results reveal that it is possible to improve the energy harvesting efficiency and output voltage by optimizing the structure＇s parameters.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第14期119-124,139,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(11172234
11372196)
河北省杰出青年培育项目(A2015210097)
关键词
随机激励
能量采集系统
相干共振
random excitation
energy harvesting system
coherence resonance
