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.
Externally Pressurized Bearings as Servomechanisms. I—The Simple Thrust Bearing
Donald F. Wilcock
Bearing, Lubrication and Seal Technology, Mechanical Technology, Incorporated, Latham, N. Y.
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Wilcock, D. F. (October 1, 1967). "Externally Pressurized Bearings as Servomechanisms. I—The Simple Thrust Bearing." ASME. J. of Lubrication Tech. October 1967; 89(4): 418–424. https://doi.org/10.1115/1.3617015
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