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TECHNICAL PAPERS

Effects of Rotary Inertia and Shear Deformation on Nonlinear Free Vibration of Microbeams

[+] Author and Article Information
Asghar Ramezani

School of Mechanical Engineering, Sharif University of Technology, P.O. Box 11365-9567, Tehran, Irana.r@mech.sharif.edu

Aria Alasty

Center of Excellence in Design, Robotics, and Automation (CEDRA), School of Mechanical Engineering, Sharif University of Technology, Tehran, Iranaalasti@sharif.edu

Javad Akbari

School of Mechanical Engineering, Sharif University of Technology, Tehran, Iranakbari@sharif.edu

J. Vib. Acoust 128(5), 611-615 (Jan 14, 2006) (5 pages) doi:10.1115/1.2202167 History: Received April 12, 2005; Revised January 14, 2006

In this paper, the large amplitude free vibration of a doubly clamped microbeam is considered. The effects of shear deformation and rotary inertia on the large amplitude vibration of the microbeam are investigated. To this end, first Hamilton’s principle is used in deriving the partial differential equation of the microbeam response under the mentioned conditions. Then, implementing the Galerkin’s method the partial differential equation is converted to an ordinary nonlinear differential equation. Finally, the method of multiple scales is used to determine a second-order perturbation solution for the obtained ODE. The results show that nonlinearity acts in the direction of increasing the natural frequency of the doubly clamped microbeam. Shear deformation and rotary inertia have significant effects on the large amplitude vibration of thick and short microbeams.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Nonlinear frequency of free vibration of a doubly clamped microbeam for L∕r=10

Grahic Jump Location
Figure 2

Nonlinear frequency of free vibration of a doubly clamped microbeam for L∕r=20

Grahic Jump Location
Figure 3

Nonlinear frequency of free vibration of a doubly clamped microbeam for L∕r=50

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