NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Fractional Whirl Motion in Wave Journal BearingsUnloaded gas, plain journal bearings experience sub-synchronous whirl motion due to fluid film instabilities and wall contact usually occurs immediately after the onset of the whirl motion. An alternative is the wave journal bearing which significantly improves bearing stability. The predicted threshold where the sub-synchronous whirl motion starts was well confirmed by the experimental observation. In addition, both a two-wave and a three-wave journal bearing can operate free of sub-synchronous whirl motion over a large range in speeds. When the sub-synchronous whirl motion occurs, both the two-wave and three-wave bearing can run in a whirl orbit well within the bearing clearance. At large clearances and wave amplitudes a two-wave bearing, unliKe other bearings, can exhibit a sub-synchronous whirl movement at both low and high speeds, but can run extremely stable and without whirl at intermediate speeds. Moreover, in these cases, the whirl frequencies are close to a quarter of the synchronous speed. The three-wave bearing can exhibit sub-synchronous whirl motion only after a specific threshold when the speed increases and the whirl frequencies are close to half of the synchronous speed.
Document ID
19960020392
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dimofte, Florin
(NASA Lewis Research Center Cleveland, OH United States)
Hendricks, Robert C.
(NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
August 17, 2013
Publication Date
March 1, 1996
Publication Information
Publication: Seals Code Development Workshop
Subject Category
Mechanical Engineering
Accession Number
96N23970
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available