A Preliminary Study of Whirl Instability for Pressurized Gas Bearings

[+] Author and Article Information
R. H. Larson

The Bendix Corporation, Research Laboratories Division, Southfield, Mich.

H. H. Richardson

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass.

J. Basic Eng 84(4), 511-518 (Dec 01, 1962) (8 pages) doi:10.1115/1.3658694 History: Received July 10, 1961; Online November 04, 2011


Experimental data are presented for the threshold of whirl instability for a short, rigid rotor supported in externally pressurized compensated gas journal bearings. The effects of supply pressures from zero to 200 psig and of radial clearances from 0.0006 to 0.0032 in. are discussed for one type of bearing configuration. A simple stability criterion is presented which explains qualitatively the observed trends. Whirl instability was observed when the frequency of rotation of the shaft exceeded from two to six times the lowest natural frequency of the shaft-bearing system.

Copyright © 1962 by ASME
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