Investigation of Whirl in Externally Pressurized Air-Lubricated Journal Bearings

[+] Author and Article Information
W. A. Gross

Applied Mechanics, IBM Research Laboratory, San Jose, Calif.

J. Basic Eng 84(1), 132-138 (Mar 01, 1962) (7 pages) doi:10.1115/1.3657234 History: Received July 10, 1961; Online November 04, 2011


The nature of whirl of a rigid rotor in externally pressurized air-lubricated journal bearings, including self-acting bearings as a special case, is discussed and an experimental investigation described. Rotor unbalance leads to synchronous whirl which can persist through one or more critical speeds. Self-excited whirl is likely when the rotational frequency is about twice the lowest critical frequency. We discuss the effects of supply pressure, number and location of sources, rotational speed, mass, unbalance, and load upon the onset of self-excited whirl, and describe first-order prediction techniques.

Copyright © 1962 by ASME
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