Whirl Instabilities in Pressure Step Bearings

[+] Author and Article Information
J. Brindley, L. Elliott, J. T. McKay

Department of Applied Mathematical Studies, University of Leeds, Leeds, LS2 9JT, England

J. Appl. Mech 53(2), 430-435 (Jun 01, 1986) (6 pages) doi:10.1115/1.3171776 History: Received November 15, 1983; Revised October 23, 1984; Online July 21, 2009


The effect on the stability of a dynamically loaded journal bearing of introducing a pressure step is examined by calculating numerically the whirl orbits described by the journal for a range of values of physical effects. In all full film cases the configuration is unstable in that the orbits spiral outwards to the bearing case; the tightness of the spiral is, however, much influenced by parameter values. The presence of appropriate cavitation permits a degree of stability, with the existence of stable whirl orbits. Cavity position and extent are vitally important to the stability characteristics, a result one would expect to be true of more realistic cavitation models than the single one used here.

Copyright © 1986 by ASME
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