Abstract
A nonlinear analysis of an energy harvester consisting of a multilayered cantilever beam with a tip mass is performed. The model takes into account geometric, inertia, and piezoelectric nonlinearities. A combination of the Galerkin technique, the extended Hamilton principle, and the Gauss law is used to derive a reduced-order model of the harvester. The method of multiple scales is used to determine analytical expressions for the tip deflection, output voltage, and harvested power near the first global natural frequency. The results show that one- or two-mode approximations are not sufficient to produce accurate estimates of the voltage and harvested power. A parametric study is performed to investigate the effects of the nonlinear piezoelectric coefficients and the excitation amplitude on the system response. The effective nonlinearity may be of the hardening or softening type, depending on the relative magnitudes of the different nonlinearities.
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Abdelkefi, A., Nayfeh, A.H. & Hajj, M.R. Effects of nonlinear piezoelectric coupling on energy harvesters under direct excitation. Nonlinear Dyn 67, 1221–1232 (2012). https://doi.org/10.1007/s11071-011-0064-9
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DOI: https://doi.org/10.1007/s11071-011-0064-9