Abstract
Vibratory energy harvesting, that is, capturing the energy of environmental vibrations and transforming into electric forms, has flourished as an important research field for micro-power generation. As a means of mechanical amplification, a subtly designed parametrically excited energy harvester could produce more power output than a corresponding directly excited energy harvester. In this paper, a simple but effective composite structure for realizing parametrically excited piezoelectric energy harvesting is first introduced, and analyzed in details by combining the harmonic balance method and the energy balance equation. Direct numerical simulations are performed to validate the theoretical predictions. Special features describing two types of observable resonances are then revealed by comprehensively monitoring the frequency response of the mean-square voltage, the input power, the output power, the energy conversion efficiency, the phase angle and the phase difference. By comparing with the directly excited energy harvesters, the advantages of parametrically excited energy harvesters are finally revealed. The most important point view of this work is that the performance of vibratory energy harvesters stems from the input power. It is suggested that superior self-adjustable broadband vibration harvesting could be exploited by constructing optimal phase to maximize the input power to achieve supreme output power.
Published Version
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