Nonlinear Oscillation of a Circular Plate Energy Harvester

Abstract eng:
Nonlinear oscillation is treated for a piezoelectric vibratory energy harvester. The harvester consists of a circular composite plate with the clamped boundary, a proof mass and two steel rings. The harvesting system is analytically modeled, numerically simulated, and experimentally tested. A lumped parameter model of the harvester is established with its parameters identified from the experimental data. The equivalent capacitance and the electromechanical coupling coefficient are analytically determined. A technique is proposed to identify the electrical parameter. A fifth polynomial is employed to approximate the nonlinear restoring force. The measured response can be approximately described by the nonlinear lumped model. Both the experimental and the numerical results demonstrate that the circular plate harvester has soft characteristics under low excitation and both hard characteristics and soft characteristics under high excitation. The characteristics can be used to broaden the working bandwidth of the harvester and thus to enhance the energy harvesting.

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