Dynamic instability analysis of U-shaped electromechanical nano-sensor operated in vdW regime

Keivani, Maryam and Ghahremani, Esmaeil and Koochi, Ali and (Mokhtari, Javad and Abadian, Naeime and Abadyan, Mohamadreza (2018) Dynamic instability analysis of U-shaped electromechanical nano-sensor operated in vdW regime. JOURNAL OF VIBROENGINEERING, 20 (1).

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Abstract

U-shape nanoelectromechanical systems (NEMS) are potential for developing miniature sensors. While the electro-mechanical performance of conventional beam-type NEMS has been exclusively addressed in the literature, few works have considered this phenomenon in U-shaped systems. Herein, the static and dynamic pull-in instability of the U-shaped NEMS is investigated under the presence of vdW force. Based on the recently developed consistent couple stress theory (CCST), the size-dependent constitutive equation is derived. Two types of the beam cross-sections including rectangular and circular geometries are considered. The nonlinear equations are solved by employing Ray-leigh-Ritz solution method. The developed model is validated by comparison with the results presented in literature. The effect of various parameters on the static and dynamic pull-in parameters, phase plans and stability threshold of the system is discussed. The obtained results reveal that the vdW attraction decreases the pull-in voltage while the size dependency enhances the instability voltage. On the other hand, the presented model demonstrates that characteristics of the tip-plate can change the pull-in parameters significantly.

Item Type: Article
Uncontrolled Keywords: U-shaped NEMS, consistent couple stress theory (CCST), vdW attraction, Rayleigh-Ritz method, dynamic pull-in instability
Subjects: QT physiology
QU Biochemistry
QV pharmacology
Divisions: Faculty of Medicine
Depositing User: Unnamed user with email zamani.m@skums.ac.ir
Date Deposited: 24 Sep 2018 10:06
Last Modified: 24 Sep 2018 10:22
URI: http://eprints.skums.ac.ir/id/eprint/7273

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