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RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Adaptive Vibration Control of a Rigid Rotor Supported by Active Magnetic Bearings

[+] Author and Article Information
O. Lang, J. Wassermann, H. Springer

Department of Mechanical Engineering, Technical University of Vienna, Vienna, Austria

J. Eng. Gas Turbines Power 118(4), 825-829 (Oct 01, 1996) (5 pages) doi:10.1115/1.2817001 History: Received February 13, 1995; Online November 19, 2007

Abstract

In this paper a digital numerical simulation is carried out in which active magnetic bearings (AMB) are applied to control nonlinear and nonsynchronous vibrations of a rigid rotor excited by nonconservative cross-coupling mechanisms. Through an adaptive control algorithm of the AMB controller, unknown cross-coupling parameters of a rotor are estimated on-line by a standard least-square estimator along with a time-varying so-called forgetting factor. The parameters of the AMB controller are adapted in order to compensate for the cross-coupling effects and to stabilize the rotor system. Transient cross-coupling response characteristics are calculated by numerical simulation of a rigid rotor supported by two active magnetic bearings. With this kind of control strategy, the stability of the system can be guaranteed for much higher values of cross-coupling coefficients than with common nonadaptive feedback controllers, designed with pole placement or least square algorithms.

Copyright © 1996 by The American Society of Mechanical Engineers
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