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Some unusual cases of rotor instability
Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
2003 (English)In: Journal of Vibration and Acoustics-Transactions of the ASME, ISSN 1048-9002, Vol. 125, no 4, 477-481 p.Article in journal (Refereed) Published
Abstract [en]

In the paper presented here three peculiar cases of rotor instability are presented. The first is a tilting-pad bearing used as an intershaft bearing in a two-spool gas turbine. It was initially chosen for its good stability properties. However in a deeper study it was found that those benefits are greatly reduced when both inner shaft and outer bearing are rotating. The second case comprises a turbine which showed a very strange performance with vibrations alternating between heavy and mild amplitudes. The periods were a couple of minutes long. After a more elaborate instrumentation was installed it was found that vibrations were synchronous and that the rotor experienced continuous changes of vibrations interrupted by sudden changes of amplitude. This revealed that nonlinearity and thermal effects coupled to the rotor vibrations must be incorporated to understand the behavior Many hypotheses were tested and the one coming closest to explaining the case was one incorporating thermal bending caused by heat conduction through an annulus partly filled with oil. The third case is a simple one of more pure curiosity, where a rotor was provided with a substantial amount of inner damping, and just according to the school book showed dynamic instability.

Place, publisher, year, edition, pages
2003. Vol. 125, no 4, 477-481 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-53543DOI: 10.1115/1.1606692OAI: diva2:289458
Available from: 2010-01-25 Created: 2010-01-25 Last updated: 2010-03-10

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Department of Mechanical EngineeringThe Institute of Technology
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Engineering and Technology

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