Design of MEMS Piezoelectric Harvesters with Electrostatically Adjustable Natural Frequency

H Madinei, H Haddad Khodaparast, S Adhikari & MI Friswell (Swansea University)

Mechanical Systems and Signal Processing, Vol. 81, December 2016, pp. 360-374

Abstract

In this paper the analytical analysis of an adaptively tuned piezoelectric vibration based energy harvester is presented. The paper considers a bimorph piezoelectric energy harvester suspended between two electrodes, subjected to a same DC voltage. The resonance frequency of the system is controllable based on the applied DC voltage. Therefore, the main motivation is to maximize harvested power by controlling the resonance frequency of the system to cope with vibration sources which have varying frequencies. The nonlinear governing differential equation of motion is derived based on Euler Bernoulli theory, and due to the softening nonlinearity of the electrostatic force, the harvester is capable of working over a broad frequency range. The steady state harmonic solution is obtained based on harmonic balance method and results are verified numerically. The results show that the harvester can be tuned to give a resonance response over a wide range of frequencies, and shows the great potential of this hybrid system for MEMS devices.

Paper Availability

This material has been published in the Mechanical Systems and Signal Processing, Vol. 81, December 2016, pp. 360-374, the only definitive repository of the content that has been certified and accepted after peer review. Copyright and all rights therein are retained by Elsevier.


Link to paper using doi: 10.1016/j.ymssp.2016.03.023

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