一种磁耦合型M形屈曲梁压电俘能器研究

Research on Magnetically Coupled M-shaped Buckled Beam Piezoelectric Energy Harvester

为了提高压电俘能器在低频弱振动环境下的俘能效率,在M形屈曲梁压电俘能器(MEH)的基础上引入非线性磁力,提出了一种磁耦合型MEH,建立了系统的集总参数模型,并基于M形屈曲梁结构的非对称性,通过实验测量并拟合了M形屈曲梁的非线性恢复力,探究了非线性磁力对系统性能的影响。仿真和实验结果表明,磁耦合型MEH具有更宽的工作频带,在0.5 g加速度激励下达到了8.3 Hz(5.5 Hz~13.8 Hz),比无磁耦合时的MEH提高了12.2%;磁耦合型MEH具有更低的跨阱阈值,在0.15 g加速度激励下可以实现大振幅周期运动。

In order to improve the energy harvesting efficiency of piezoelectric energy harvester in low frequency and weak vibration environment,a magnetic coupling M-shaped buckled beam piezoelectric energy harvester(MEH)was proposed,which was derived from the original MEH.The lumped parameter model of the system was established.The nonlinear restoring force of the M-shaped buckled beam was measured and fitted experimentally,and the influence of the nonlinear magnetic force on the system performance was investigated.The simulation and experimental results show that the magnetically coupled MEH has a wider operating frequency band,reaching 8.3 Hz(5.5 Hz-13.8 Hz)under 0.5 g acceleration excitation,which is 12.2%higher than the original MEH.The magnetically coupled MEH has a lower cross-well barrier and can achieve large amplitude periodic motion under 0.15 g acceleration excitation.