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Type: Journal article
Title: Modal interactions and energy transfers in large-amplitude vibrations of functionally graded microcantilevers
Author: Farokhi, H.
Ghayesh, M.
Gholipour, A.
Hussain, S.
Citation: Journal of Vibration and Control, 2018; 24(17):3882-3893
Publisher: SAGE Publications
Issue Date: 2018
ISSN: 1077-5463
Statement of
Hamed Farokhi, Mergen H Ghayesh, Alireza Gholipour and Shahid Hussain
Abstract: 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.
Keywords: Functionally graded microcantilever; size-dependent vibration; material gradient index; natural frequency; modal interaction; energy transfer
Rights: © The Author(s) 2017 Article reuse guidelines:
RMID: 0030085918
DOI: 10.1177/1077546317714883
Appears in Collections:Mechanical Engineering publications

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