RESEARCH PAPERS: Rotor Dynamics Papers

Finite Journal Bearing With Nonlinear Stiffness and Damping. Part 1: Improved Mathematical Models

[+] Author and Article Information
E. Hashish, T. S. Sankar, M. O. M. Osman

Department of Mechanical Engineering, Concordia University, Montreal, Quebec, Canada

J. Mech. Des 104(2), 397-405 (Apr 01, 1982) (9 pages) doi:10.1115/1.3256357 History: Received June 04, 1981; Online November 17, 2009


Two mathematical models for the nonlinear hydrodynamic film forces in a finite bearing are developed including a practical adaptation of the cavitation phenomenon. Using the linearity of the Reynolds equation for incompressible film, the pressure components are effectively decomposed and the Reynolds equation is rearranged for general solution by a finite element program in which only the L/d ratio and the eccentricity ratio are to be specified. The different possibilities of partial film profile location in a general dynamic case are demonstrated. The two partial film models possess the required accuracy of the finite bearing approach with the simplicity of the known long and short bearing approximations which are shown as the upper and lower bounds for the present case. The finite bearing approach presented are particularly suitable for nonlinear dynamic analysis.

Copyright © 1982 by ASME
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