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RESEARCH PAPERS

On-Line Thermal Balancing Technique for a Large Turbo-Generator

[+] Author and Article Information
M. Zumbach, G. Schweitzer

Mechatronics Lab, ETH Zurich, CH-8092 Zurich, Switzerland

K. Schoellhorn

Large Turbo-Generators Department, ABB Power Generation Ltd., CH-5401 Baden, Switzerland

J. Vib. Acoust 114(1), 60-66 (Jan 01, 1992) (7 pages) doi:10.1115/1.2930235 History: Received January 01, 1990; Online June 17, 2008

Abstract

In this paper a new technique is proposed to rebalance automatically a large turbo-generator during operation. The sensitivity of the rotor unbalances to thermal asymmetries in the rotor is exploited by mounting some heating elements and using them as actively controlled actuators. The shaft vibrations are measured and used as input signals of the feedback controller. Unbalances thus can be compensated during rotor operation. A theoretical model of the thermo-elastic rotor has been developed and an appropriate closed-loop control system has been designed. The simulation results are verified on a special test rig with digital control allowing for varioius control strategies and various operating conditions.

Copyright © 1992 by The American Society of Mechanical Engineers
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