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A low frequency nonlinear energy harvester with large bandwidth utilizing magnet levitation

机译：利用磁悬浮的大带宽低频非线性能量采集器

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摘要

The application of vibration based energy harvesting in civil infrastructures usually has to resolve two major problems, namely, the low excitation frequency and large frequency range. To this end, a nonlinear energy harvester utilizing magnet levitation is proposed in this study. The proposed harvester can convert low frequency excitations into high frequency ones in its four doubly clamped piezoelectric beams through multi-impact. A large bandwidth is expected due to the stiffness nonlinearity introduced by using magnet levitation. A theoretical model is first developed for the harvester. Then, sinusoidal vibrations and simulated bridge vibrations are used as the external excitations to verify the performance of the harvester. The simulation results show an improved robustness of the harvester under low frequency vibrations, which indicates the proposed harvester is an ideal device for energy harvesting in civil infrastructures.
机译：基于振动的能量收集在民用基础设施中的应用通常必须解决两个主要问题，即低激励频率和大频率范围。为此，本研究提出了一种利用磁悬浮的非线性能量收集器。所提出的收割机可以通过多重冲击将其四个双重夹持的压电梁中的低频激励转换为高频激励。由于使用磁悬浮引入的刚度非线性，预计会有较大的带宽。首先为收割机开发了一个理论模型。然后，将正弦振动和模拟的桥梁振动用作外部激励，以验证收割机的性能。仿真结果表明，该收割机在低频振动下具有更高的鲁棒性，这表明该收割机是民用基础设施中能量收集的理想设备。

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