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Heuristic explanation of journal bearing instabilityA fluid-filled journal bearing is viewed as a powerful pump circulating fluid around the annular space between the journal and the bearing. A small whirling motion of the journal generates a wave of thickness variation progressing around the channel. The hypothesis that the fluid flow drives the whirl whenever the mean of the pumped fluid velocity is greater than the peripheral speed of the thickness variation wave is discussed and compared with other simple explanations of journal bearing instability. It is shown that for non-cavitation long bearings the hypothesis predicts instability onset correctly for unloaded bearings but gradually overpredicts the onset speed as the load is increased.
Document ID
19830007376
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Crandall, S. H.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
August 11, 2013
Publication Date
December 1, 1982
Publication Information
Publication: NASA. Lewis Research Center Rotordyn. Instability Probl. in High-Performance Turbomachinery
Subject Category
Mechanical Engineering
Accession Number
83N15647
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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