RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Balanced Model Reduction and Control of Rotor-Bearing Systems

[+] Author and Article Information
J. T. Sawicki

Department of Mechanical Engineering, Cleveland State University, Cleveland, OH 44115

W. K. Gawronski

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109

J. Eng. Gas Turbines Power 119(2), 456-463 (Apr 01, 1997) (8 pages) doi:10.1115/1.2815596 History: Received April 14, 1996; Online November 19, 2007


An effective technique is applied to the suppression of vibrations in flexible rotor-bearing systems with small gyroscopic effects. A balanced linear-quadratic-Gaussian (LQG) controller design procedure is implemented. The size of the controller is reduced in two stages by using (i) a balanced model reduction, and (ii) an LQG balanced reduction. The condition for a gyroscopic matrix is developed that allows one to ignore the rotor gyroscopic effects in the process of the controller design, although they are included in the rotor dynamics. The approach is illustrated on a typical rotor-bearing system represented by a 48 degree-of-freedom finite element model.

Copyright © 1997 by The American Society of Mechanical Engineers
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