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International Journal of Rotating Machinery
Volume 1 (1995), Issue 3-4, Pages 293-299
http://dx.doi.org/10.1155/S1023621X95000145

Modelling Turbine Vibration in Terms if its Load Variation

1University of Melbourne, Department of Mechanical and Manufacturing Engineering, Parkville 3052, Victoria, Australia
2Scientific Engineering Research, 29 Hotham St. East St. Kilda, Melbourne 3183, Victoria, Australia

Copyright © 1995 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper is based on a case history of a 650 MW turbine-generator, which changed its vibration significantly every time when a change of its thermal/electrical load was made. Significant changes of vibration amplitude and phase distribution along the shaft indicated the contribution of different modes of vibration. Interestingly, vibration of other identical units manufactured by the same manufacturer were not sensitive to load variation. A vibration monitoring system, relying on observing slow trends in vibration data, was not able to interpret the significant vibration changes. In particular, it was not clear, whether or not there was a fault in the system and whether or not the unit was safe to operate. The paper presents problem modelling, analysis and the explanation for vibration changes. Presented analysis explains that vibration changes were not associated with the fault in the system but they were a natural response of the system to parameter change.