ABSTRACT

This paper presents an enhancement energy harvesting in a cantilever system using bilateral multi-impact oscillators with nonlinear magnetic flux for a broad bandwidth frequency. Two nonlinear oscillators with low resonant frequency provided bilateral multi-impacts onto a cantilever beam in different positions. The nonlinear electromagnetic distribution around the coil placing the tip of the cantilever beam produced the Lorenz force along with the motion during the system in operation. The response frequencies of the cantilever beam were no longer near its resonance frequency due to the bilateral multi-impact oscillators. The strong impacts and nonlinear Lorenz force affected the entire system, which reduced power harvesting enhancement with a large response frequency range from the oscillator’s natural frequency (12 Hz) to several times its frequency (39 Hz). It was also observed that the numerical simulations of the obtained power of the cantilever beam were a good agreement with the experimental results. Moreover, the two magnets placing the top and bottom of the tip cantilever beam in repulsion had a much higher voltage response due to the strong nonlinear transient magnetic flux, which resulted in ~4 times more power in the bilateral multiple impacts system.

摘要

本文提出了一种在悬臂系统中使用具有非线性磁通量的双边多冲击振荡器的增强能量收集，用于宽带宽频率。两个具有低共振频率的非线性振荡器在不同位置对悬臂梁提供双边多重冲击。放置悬臂梁尖端的线圈周围的非线性电磁分布在系统运行期间随着运动产生洛伦兹力。由于双边多冲击振荡器，悬臂梁的响应频率不再接近其共振频率。强烈的冲击和非线性洛伦兹力影响了整个系统，从振荡器的自然频率（12 Hz）到其频率（39 Hz）的几倍，从而降低了功率收集增强。还观察到，所获得的悬臂梁功率的数值模拟与实验结果吻合良好。此外，由于强非线性瞬态磁通量，将尖端悬臂梁的顶部和底部置于排斥状态的两个磁体具有更高的电压响应，这导致双边多重冲击系统中的功率增加了约 4 倍。