Modal interactions and energy transfers in large-amplitude vibrations of functionally graded microcantilevers

Farokhi, Hamed, Ghayesh, Mergen H., Gholipour, Alireza and Hussain, Shahid (2018) Modal interactions and energy transfers in large-amplitude vibrations of functionally graded microcantilevers. Journal of Vibration and Control, 24 (17). pp. 3882-3893. ISSN 1077-5463

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Modal interactions and internal energy transfers are investigated in the large-amplitude oscillations of a functionally graded microcantilever with an intermediate spring-support. Based on the Mori–Tanaka homogenization technique and the modified couple stress theory, the energy terms of the functionally graded microsystem (kinetic and size-dependent potential energies) are developed and dynamically balanced. Large-amplitude deformations, due to having one end free, are modeled taking into account curvature-related nonlinearities and assuming an inextensibility condition. The continuous model of the functionally graded microsystem is reduced, by means of the Galerkin method, yielding an inertial- and stiffness-wise nonlinear model. Numerical simulations on this highly nonlinear reduced-order model of the functionally graded microcantilever are performed using a continuation method; a possible case of modal interactions is determined by obtaining the natural frequencies of the microsystem. The nonlinear oscillations of the microcantilever are examined, and it is shown how the energy fed to the functionally graded microsystem (from the base excitation) is transferred between different modes of oscillation.

Item Type: Article
Uncontrolled Keywords: Functionally graded microcantilever, size-dependent vibration, material gradient index, natural frequency, modal interaction, energy transfer
Subjects: H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Paul Burns
Date Deposited: 22 Aug 2018 14:19
Last Modified: 10 Oct 2019 18:15

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