The paper presents a combination of the Galerkin-Bubnov decomposition procedure and Optimal Homotopy Asymptotic Method (OHAM) to derive analytical approximate solutions to nonlinear vibration of clamped-clamped micro-electro-mechanical system (MEMS). The nonlinear governing equation of microbeam vibration pre-deformed by an elastic constant field includes both even and odd nonlinearities. The accuracy of the proposed procedure is validates via numerical results.
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