Journal
NONLINEAR DYNAMICS
Volume 90, Issue 4, Pages 2495-2506Publisher
SPRINGER
DOI: 10.1007/s11071-017-3815-4
Keywords
Vibratory energy harvesting; Circular composite plate; Piezoelectricity; Parameter identification; Nonlinearity
Categories
Funding
- State Key Program of National Natural Science of China [11232009]
- National Natural Science Foundation of China [51575334]
- Innovation Program of Shanghai Municipal Education Commission [14ZZ158]
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A piezoelectric energy harvester is investigated with the focus on its nonlinear behavior. The harvester consists of a circular composite plate with the clamped boundary, a proof mass and two steel rings. A reduced-order model of the harvester is established, and the parameters are identified from the experimental data. A technique is proposed to identify electrical parameters with the outcomes agreeing with the theoretical values, and a fifth-order polynomial is employed to approximate the nonlinear restoring force. Both the experimental and the numerical results demonstrate that the harvester changes its characteristic from linearity to a softening nonlinearity and finally to a combined softening and hardening nonlinearity as the excitation increases from low to high.
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