Research on Magnetically Coupled M-shaped Buckled Beam Piezoelectric Energy Harvester
In order to improve the energy harvesting efficiency of piezoelectric energy harvester in low fre-quency 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 wi-der 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 bar-rier and can achieve large amplitude periodic motion under 0.15 g acceleration excitation.
piezoelectric energy harvesterM-shaped buckled beamnonlinearbistable
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