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International Journal of Rotating Machinery
Volume 10, Issue 6, Pages 469-475

Part I—Theoretical Model for a Synchronous Thermal Instability Operating in Overhung Rotors

1Siemens Westinghouse Power Corporation, Orlando, Florida, USA
2Mechanical Engineering Department, Randolph Hall, Virginia Tech, Blacksburg 24061, VA, USA

Copyright © 2004 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.


Atheoretical model has been developed for a synchronous thermal instability that is caused by differential viscous shearing in bearings of overhung rotors. This model employs an unbalance threshold criterion for instability instead of utilizing a traditional frequency-domain stability analysis. The current model will be used to investigate several case studies for both plain and tilting pad journal bearing rotors in the second part of this article.