This paper presents a novel energy harvesting device"driven by concurrent aeroelastic vibration and base vibratory excitation.The harvester undergoes flow-induced limit-cycle oscillation under galloping instability,and at the same time,inertia force induced vibration is present due to the base vibratory excitation.A limitation with a traditional linear aeroelastic energy harvester is that effective energy harvesting from combined sources is only achievable within a narrow frequency range.To overcome this issue,bistability is introduced by exploiting nonlinear restoring force.A lumped aero-electro-mechanical model is established to incorporate the mutual coupling between the wind flow,piezoelectric element,nonlinear structure and circuit.Dynamic responses are investigated for different bistable configurations.Results show that the proposed harvester achieves a significantly widened bandwidth over which the two excitation frequencies are forced to lock into each other,and both vibratory and aeroelastic energy are effectively harnessed.
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