The Influence of Fluid Inertia on the Dynamic Properties of Journal Bearings

[+] Author and Article Information
E. Reinhardt, J. W. Lund

Department of Machine Design, Technical University of Denmark, Lyngby, Denmark

J. of Lubrication Tech 97(2), 159-165 (Apr 01, 1975) (7 pages) doi:10.1115/1.3452546 History: Received June 21, 1974; Online October 18, 2010


Based on a first-order perturbation solution in a modified Reynolds number an analysis is presented to determine the effect of the fluid film inertial forces on the dynamic properties of a journal bearing. The corrections to the regular amplitude and velocity coefficients are found to be small, but the accompanying acceleration coefficients which may correspond to a virtual mass of several times the mass of the journal itself, could become significant for short rotors. Numerical results are given in graphical form with dimensionless coefficients as functions of the operating eccentricity ratio.

Copyright © 1975 by ASME
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