Microstructure-dependent dynamic behavior of torsional nano-varactor

Mohammad-Sedighi, Hamid. and Koochi, Ali. and Keivani, Maryam. and Abadyan, Mohamadreza. (2017) Microstructure-dependent dynamic behavior of torsional nano-varactor. Measurement: Journal of the International Measurement Confederation, 111. pp. 114-121.

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Abstract

Experiments depict that the physico-mechanical response of miniature devices is microstructure-dependent. However, the classic continuum theory cannot correctly predict the microstructure-dependency. In this paper, the strain gradient theory is employed to examine the dynamic behavior and instability characteristics of miniature varactor with trapezoidal geometry. The governing equation of the varactor is obtained incorporating the effects of Coulomb force, van der Waals (vdW) attraction, squeeze film damping and structural damping. The influences of microstructure on the dynamic instability of equilibrium points are studied by plotting the phase portrait and bifurcation diagrams. It is found that increase in the microstructure parameter enhances the torsional stability. In the presence of the applied voltage, the phase portrait shows the saddle-node bifurcation while for free-standing varactor a subcritical pitchfork bifurcation is observed

Item Type: Article
Additional Information: cited By 0
Uncontrolled Keywords: nano-electromechanical varactor; microstructure; strain gradient theory; dynamic instability; van der Waals force
Subjects: QT physiology
Divisions: Faculty of Medicine
Depositing User: Users 1 not found.
Date Deposited: 18 Sep 2017 05:32
Last Modified: 17 Feb 2018 06:32
URI: http://eprints.skums.ac.ir/id/eprint/5145

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