Abstract:The piezoelectric energy harvester with magnetic coupling can realize wide-band vibration energy harvesting, but the output power is greatly affected by the excitation direction. In order to make the energy harvester obtain large mechanical energy in real time, a new type of energy harvesting device is designed, which uses the inertia force of pendulum to adjust the relative position of piezoelectric coupling cantilever beam and magnet in real time. The dynamic model of the system was established by the energy method, and the multiscale method and numerical computation method were used to get the solution of the system. The combination resonance characteristics of the system were analyzed under the action of the external excitation, and the effects of the external excitation amplitude, the distance between magnets, the length of the swinging arm, the length and width of the cantilever beam on the effective harvesting frequency band width and output voltage were discussed. The results show that the swing arm can make the system obtain higher mechanical vibration amplitude under the excitation of larger acceleration, and the energy harvesting frequency band can be expanded effectively. The performance of energy harvester can be improved effectively by changing the distance between magnets, the length of the swing arm and the structural parameters of the cantilever beam.
石慧荣,左存胜,高全福. 随动压电磁耦合能量采集器的组合共振分析[J]. 振动与冲击, 2024, 43(3): 209-217.
SHI Huirong, ZUO Cunsheng, GAO Quanfu. Combined resonance analysis of a servo piezoelectric-magnetic coupled energy harvester. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(3): 209-217.
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