Variable Structure Control of a Mass Spring Damper Subjected to a Unilateral Constraint: Application to Radio-Frequency MEMS Switches

Author:

Allafi Amer L.1,Chahal Premjeet2,Mukherjee Ranjan1,Khalil Hassan K.2

Affiliation:

1. Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824 e-mail:

2. Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824 e-mail:

Abstract

A feedback control strategy is presented for improving the transient response of the ubiquitous mass-spring-damper (MSD) system; the closed-loop system has a small settling time with no overshoot for a step input. This type of response is ideal for MSD systems subjected to a unilateral constraint such as radio-frequency micro-electro-mechanical-system (RF MEMS) switches, which are required to close in a short period of time without bouncing. The control strategy switches the stiffness of the MSD between its nominal value and a negative value, resulting in a hybrid dynamical system. A phase portrait analysis of the hybrid system is carried out to establish the asymptotic stability property of the equilibrium and quantify the transient response. Simulation results are presented using parameter values of a real RF MEMS switch from the literature. As compared to open-loop strategies that are currently used, the proposed feedback control strategy promises to provide comparable switch-closing times with robust performance and eliminate bouncing.

Publisher

ASME International

Subject

Computer Science Applications,Mechanical Engineering,Instrumentation,Information Systems,Control and Systems Engineering

Reference28 articles.

1. A Simple Learning Control to Eliminate RF-MEMS Switch Bounce;J. Microelectromech. Syst.,2009

2. Compact RF Model for Transient Characteristics of MEMS Capacitive Switches;IEEE Trans. Microwave Theory Tech.,2009

3. Variable Structure Systems With Sliding Modes;IEEE Trans. Autom. Control,1977

4. Variable Structure Control: A Survey;IEEE Trans. Ind. Electron.,1993

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