Modal Testing and Suboptimal Vibration Control of Flexible Rotor Bearing System by Using a Magnetic Bearing

[+] Author and Article Information
Chong-Won Lee

Center for Noise and Vibration Control, Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Science Town, Taejon, Korea

Jong-Sun Kim

Department of Mechanical Engineering and Design, Hankuk Aviation University, Koyang, Kyungki, Korea

J. Dyn. Sys., Meas., Control 114(2), 244-252 (Jun 01, 1992) (9 pages) doi:10.1115/1.2896521 History: Received September 19, 1990; Revised May 17, 1991; Online March 17, 2008


A suboptimal output feedback controller is designed based on a reduced order model and applied to a flexible rotor bearing system in order to control the unstable or lightly damped vibrations occurring during operation. The reduced order model is a truncated modal equation of the distributed parameter system obtained through the singular perturbation. The instability problem arising from the spillover effects caused by the uncontrolled high frequency modes is prevented through the constrained optimization by incorporating the spillover term into the performance index. The application of the matrix minimum principle yields a set of matrix equation similar to the unconstrained output feedback controller. The efficiency of the proposed method is demonstrated experimentally with a flexible rotor by using a magnetic bearing.

Copyright © 1992 by The American Society of Mechanical Engineers
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