A Finite Length Bearing Correction Factor for Short Bearing Theory

[+] Author and Article Information
L. E. Barrett, P. E. Allaire, E. J. Gunter

Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, Va. 22901

J. of Lubrication Tech 102(3), 283-287 (Jul 01, 1980) (5 pages) doi:10.1115/1.3251508 History: Revised July 05, 1979; Online November 17, 2009


A rapid method for calculating the general nonlinear response of finite-length plain journal and squeeze film damper bearings is presented. The method incorporates a finite-length correction factor which modifies the nonlinear forces obtained from short bearing theory. The steady-state rotational, precessive squeeze, and radial squeeze forces obtained with the correction factor compare extremely well with the forces obtained from an analytic solution of Reynolds equation using a variational approach up to L/D of 1.25 and hence covers the most commonly encountered L/D ratios. The method is no more time consuming than the short bearing analysis and is especially suited to nonlinear transient analysis of flexible rotors.

Copyright © 1980 by ASME
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