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Open AccessArticle

Monostable Dynamic Analysis of Microbeam-Based Resonators via an Improved One Degree of Freedom Model

by Lei Li 1,2,*, Qichang Zhang 2, Wei Wang 2 and Jianxin Han 3
School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo 255049, China
Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300350, China
Tianjin Key Laboratory of High Speed Cutting and Precision Machining, Tianjin University of Technology and Education, Tianjin 300222, China
Author to whom correspondence should be addressed.
Micromachines 2018, 9(2), 89;
Received: 17 December 2017 / Revised: 8 February 2018 / Accepted: 19 February 2018 / Published: 22 February 2018
(This article belongs to the Special Issue Micro-Resonators: The Quest for Superior Performance)
Monostable vibration can eliminate dynamic bifurcation and improve system stability, which is required in many microelectromechanical systems (MEMS) applications, such as microbeam-based and comb-driven resonators. This article aims to theoretically investigate the monostable vibration in size-effected MEMS via a low dimensional model. An improved single degree of freedom model to describe electrically actuated microbeam-based resonators is obtained by using modified couple stress theory and Nonlinear Galerkin method. Static displacement, pull-in voltage, resonant frequency and especially the monostable dynamic behaviors of the resonators are investigated in detail. Through perturbation analysis, an approximate average equation is derived by the application of the method of Multiple Scales. Theoretical expressions about parameter space and maximum amplitude of monostable vibration are then deduced. Results show that this improved model can describe the static behavior more accurately than that of single degree of freedom model via traditional Galerkin Method. This desired monostable large amplitude vibration is significantly affected by the ratio of the gap width to mircobeam thickness. The optimization design results show that reasonable decrease of this ratio can be beneficial to monostable vibration. All these analytical results are verified by numerical results via Differential Quadrature method, which show excellent agreement with each other. This analysis has the potential of improving dynamic performance in MEMS. View Full-Text
Keywords: MEMS; monostable vibration; Nonlinear Galerkin method; optimization MEMS; monostable vibration; Nonlinear Galerkin method; optimization
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Li, L.; Zhang, Q.; Wang, W.; Han, J. Monostable Dynamic Analysis of Microbeam-Based Resonators via an Improved One Degree of Freedom Model. Micromachines 2018, 9, 89.

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