Volume 18, Issue 1 (2018)                   Modares Mechanical Engineering 2018, 18(1): 231-238 | Back to browse issues page

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Mokhtari Amir Majdi M A, Tahani M. Size-dependent analysis of micro-bridge gyroscopes under the combined effects of instantaneous DC voltage and harmonic base excitations. Modares Mechanical Engineering. 2018; 18 (1) :231-238
URL: http://journals.modares.ac.ir/article-15-9890-en.html
1- Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
2- Ferdowsi University of Mashhad
Abstract:   (1066 Views)
The aim of the proposed study is to investigate the size dependent behavior of the micro-bridge gyroscopes under the combined effects of instantaneous DC voltage and harmonic base excitation. To do so, modified couple stress theory is utilized to model the size-dependent behavior of the micro-gyroscope. To avoid resonance, viscous damping is used. Hamilton’s principle is then employed to derive the governing equations of motion. Afterwards, to convert the partial differential equations of motion to ordinary differential equations of motion, a Galerkin based single mode approximation is made. Then fourth-order Range-Kutta method is used to solve the governing equations of motion. To check the accuracy of the present model, the results are then validated through comparison with the available results in the literature and the comparison shows good agreements. In addition to the previous comparison, the present results are the validated through comparison with the results of COMSOL simulation. Furthermore, the effects of different parameters on the dynamic pull-in instability and amplitude of the vibrations are investigated. The observation shows that for the case of the harmonic base excitation, the system will be excited on two frequencies.
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Article Type: Research Article | Subject: Micro & Nano Systems
Received: 2017/08/20 | Accepted: 2017/11/6 | Published: 2018/01/5

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