附加非线性振子的双稳态电磁式振动能量捕获器动力学特性研究

Abstract

With the progress of the micro-electromechanical technology, the systems self-powered by ambient vibration have become a focus in nonlinear dynamics. The concept of bistable electromagnetic vibration energy harvesters with auxiliary nonlinear oscillators was proposed through combination of a mass-spring-damper system with a bistable vibration energy harvester, and the mechanical model and control equations for this system were established, the dynamic responses of the bistable electromagnetic vibration energy harvester with a nonlinear oscillator under harmonic excitation were investigated with the parametrical changes of the mass ratio and the tuning ratio through numerical simulation. Then, in comparison with that on the bistable system with an auxiliary linear oscillator, the influence rule of the above changing parameters on the bistable electromagnetic vibration energy harvester with an auxiliary nonlinear oscillator, which would get into chaotic movement, was obtained, and the superiority of the one with an auxiliary nonlinear oscillator was demonstrated. Moreover, the optimal parameters for the bistable electromagnetic vibration energy harvester with an auxiliary nonlinear oscillator in continuous large-amplitude chaotic motion were given. These above results provide a theoretical basis for the research of bistable electromagnetic vibration energy harvesters.