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Modeling and experiment of bistable two-degree-of-freedom energy harvester with magnetic coupling

机译：磁耦合双稳态双自由度能量采集器的建模与实验

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The operating bandwidth of energy harvesters is one main concern in vibration energy harvesting due to the random and time-varying nature of most vibration sources. Recent research efforts have been made to address this issue including exploiting multimodal structures and nonlinear dynamics. These ideas have yielded some exciting results to leverage the broadband performance. Hybrid configurations combining these ideas are expected to provide an even better operating bandwidth and yet to be studied. In this paper, a bistable two-degree-of-freedom (2-DOF) piezoelectric energy harvester (PEH) with magnetic coupling is proposed, in which a linear parasitic oscillator attached to the main energy harvesting beam is used to generate two resonant peaks and the magnetic coupling is used to generate nonlinear dynamics, thus to achieve broadband electrical outputs. A nonlinear electromechanical model of the proposed harvester is established and the parametric study is conducted for various parasitic oscillator configurations. Experiment is subsequently performed to validate the theoretical analysis. The results indicate that nonlinear responses can appear at any of the two peaks or at both. One strong nonlinear peak in addition to a quasi-linear peak can be achieved by adequate adjustment of the parasitic oscillator. This is advantageous over the optimal linear 2-DOF PEH in terms of wider bandwidth thanks to the involved nonlinear dynamics. In addition, the load resistance has significant influence around the peak with strong nonlinear responses, resulting in evident peak shift. The best power output is accompanied with a shrunk bandwidth due to the peak shift.
机译：由于大多数振动源的随机性和时变性，能量收集器的工作带宽是振动能量收集中的一个主要问题。为了解决这个问题，最近进行了研究，包括利用多峰结构和非线性动力学。这些想法产生了一些激动人心的成果，可以充分利用宽带性能。结合了这些思想的混合配置有望提供更好的工作带宽，尚待研究。本文提出了一种具有磁耦合的双稳态两自由度（2-DOF）压电能量收集器（PEH），其中将线性寄生振荡器附加到主能量收集束上以产生两个谐振峰磁耦合用于产生非线性动力学，从而实现宽带电输出。建立了所提出的收割机的非线性机电模型，并针对各种寄生振荡器配置进行了参数研究。随后进行实验以验证理论分析。结果表明，非线性响应可以出现在两个峰值中的任何一个或同时出现在两个峰值上。除了准线性峰值外，还可以通过适当调整寄生振荡器来实现一个强非线性峰值。由于涉及到非线性动力学，因此在较宽的带宽方面优于最佳线性2-DOF PEH。此外，负载电阻在峰值附近具有显着的非线性响应，因此影响很大，从而导致明显的峰值漂移。最佳功率输出伴随着由于峰值偏移而缩小的带宽。

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