Externally Pressurized Bearings as Servomechanisms. I—The Simple Thrust Bearing

[+] Author and Article Information
Donald F. Wilcock

Bearing, Lubrication and Seal Technology, Mechanical Technology, Incorporated, Latham, N. Y.

J. of Lubrication Tech 89(4), 418-424 (Oct 01, 1967) (7 pages) doi:10.1115/1.3617015 History: Received July 05, 1966; Online July 11, 2011


The externally pressurized bearing may be considered and analyzed as an hydraulic closed-loop servomechanism. The use of restrictor feed devices introduces an inner loop that reduces the gain. The time-dependent flow due to the change in volume with film thickness creates a “lead” break frequency favorable to stability. Fluid compressibility, on the other hand, leads to a “lag” break frequency which, if it approaches or becomes less than the “lead” frequency, results in bearing instability. Analysis by transfer function furnishes fresh insight into EP bearing behavior.

Copyright © 1967 by ASME
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