Some experiments on oil whirl and oil whip

A. El-Shafei, S. H. Tawfick, M. S. Raafat, G. M. Aziz

Research output: Contribution to conferencePaperpeer-review


The oil whirl and oil whip phenomena are well known since the early twentieth century. However, there is a lot of confusion on the parameters that affect the onset of instability. In this study, we investigate the onset of instability on a flexible rotor mounted on two plain cylindrical journal bearings. The rotor is run through the first critical speed, the instability, and the second critical speed. Tests are conducted at various unbalance levels, pressures, and misalignment conditions on the coupling. It is shown that, by far, the misalignment of the coupling is the parameter that is most effective on the onset of instability. In particular angular misalignment resulted in the smoothest rotor response.

Original languageEnglish (US)
Number of pages10
StatePublished - 2004
Externally publishedYes
Event2004 ASME Turbo Expo - Vienna, Austria
Duration: Jun 14 2004Jun 17 2004


Other2004 ASME Turbo Expo

ASJC Scopus subject areas

  • Engineering(all)


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