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

Hamed Farokhi, Mergen H. Ghayesh, Alireza Gholipour, Shahid Hussain

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3882-3893
Number of pages12
JournalJVC/Journal of Vibration and Control
Volume24
Issue number17
DOIs
Publication statusPublished - 27 Jun 2017
Externally publishedYes

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Microsystems
Energy transfer
Galerkin methods
Potential energy
Natural frequencies
Stiffness
Kinetics
Computer simulation

Cite this

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title = "Modal interactions and energy transfers in large-amplitude vibrations of functionally graded microcantilevers",
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.",
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Modal interactions and energy transfers in large-amplitude vibrations of functionally graded microcantilevers. / Farokhi, Hamed; Ghayesh, Mergen H.; Gholipour, Alireza; Hussain, Shahid.

In: JVC/Journal of Vibration and Control, Vol. 24, No. 17, 27.06.2017, p. 3882-3893.

Research output: Contribution to journalArticle

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