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Stability, Nonlinearity and Reliability of Electrostatically Actuated MEMS Devices
State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
National Key Laboratory of Micro/Nano Fabrication Technology, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, China
* Author to whom correspondence should be addressed.
Received: 13 April 2007 / Accepted: 21 May 2007 / Published: 31 May 2007
Abstract: Electrostatic micro-electro-mechanical system (MEMS) is a special branch with a wide range of applications in sensing and actuating devices in MEMS. This paper provides a survey and analysis of the electrostatic force of importance in MEMS, its physical model, scaling effect, stability, nonlinearity and reliability in detail. It is necessary to understand the effects of electrostatic forces in MEMS and then many phenomena of practical importance, such as pull-in instability and the effects of effective stiffness, dielectric charging, stress gradient, temperature on the pull-in voltage, nonlinear dynamic effects and reliability due to electrostatic forces occurred in MEMS can be explained scientifically, and consequently the great potential of MEMS technology could be explored effectively and utilized optimally. A simplified parallel-plate capacitor model is proposed to investigate the resonance response, inherent nonlinearity, stiffness softened effect and coupled nonlinear effect of the typical electrostatically actuated MEMS devices. Many failure modes and mechanisms and various methods and techniques, including materials selection, reasonable design and extending the controllable travel range used to analyze and reduce the failures are discussed in the electrostatically actuated MEMS devices. Numerical simulations and discussions indicate that the effects of instability, nonlinear characteristics and reliability subjected to electrostatic forces cannot be ignored and are in need of further investigation.
Keywords: MEMS; Electrostatic force; Scaling effect; Stability; Nonlinearity; Reliability.
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Cite This Article
MDPI and ACS Style
Zhang, W.-M.; Meng, G.; Chen, D. Stability, Nonlinearity and Reliability of Electrostatically Actuated MEMS Devices. Sensors 2007, 7, 760-796.
Zhang W-M, Meng G, Chen D. Stability, Nonlinearity and Reliability of Electrostatically Actuated MEMS Devices. Sensors. 2007; 7(5):760-796.
Zhang, Wen-Ming; Meng, Guang; Chen, Di. 2007. "Stability, Nonlinearity and Reliability of Electrostatically Actuated MEMS Devices." Sensors 7, no. 5: 760-796.