Eur. Phys. J. Appl. Phys.
Volume 79, Number 2, August 2017
|Number of page(s)||15|
|Section||Physics of Energy Transfer, Conversion and Storage|
|Published online||10 July 2017|
Obtaining high-energy responses of nonlinear piezoelectric energy harvester by voltage impulse perturbations
Department of Mechanical Engineering, University of Auckland, 20 Symonds Street, Auckland 1010, New Zealand
2 Department of Mechanical Engineering, Northwestern Polytechnical University, Xi’an, 710072, P.R. China
a e-mail: firstname.lastname@example.org
Revised: 1 June 2017
Accepted: 2 June 2017
Published online: 10 July 2017
Nonlinear energy harvesters have attracted wide research attentions to achieve broadband performances in recent years. Nonlinear structures have multiple solutions in certain frequency region that contains high-energy and low-energy orbits. It is effectively the frequency region of capturing a high-energy orbit that determines the broadband performance. Thus, maintaining large-amplitude high-energy-orbit oscillations is highly desired. In this paper, a voltage impulse perturbation approach based on negative resistance is applied to trigger high-energy-orbit responses of piezoelectric nonlinear energy harvesters. First, the mechanism of the voltage impulse perturbation and the implementation of the synthetic negative resistance circuit are discussed in detail. Subsequently, numerical simulation and experiment are conducted and the results demonstrate that the high-energy-orbit oscillations can be triggered by the voltage impulse perturbation method for both monostable and bistable configurations given various scenarios. It is revealed that the perturbation levels required to trigger and maintain high-energy-orbit oscillations are different for various excitation frequencies in the region where multiple solutions exist. The higher gain in voltage output when high-energy-orbit oscillations are captured is accompanied with the demand of a higher voltage impulse perturbation level.
© EDP Sciences, 2017
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