Finite Element Approach to the Prediction of Foil Bearing Rotor Dynamic Coefficients

[+] Author and Article Information
J.-P. Peng

Seagate Technology, Bloomington, MN 55435

M. Carpino

Department of Mechanical Engineering, Pennsylvania State University, University Park, PA 16802

J. Tribol 119(1), 85-90 (Jan 01, 1997) (6 pages) doi:10.1115/1.2832484 History: Received February 29, 1996; Revised May 17, 1996; Online January 24, 2008


A finite element perturbation approach to the prediction of foil bearing stiffness and damping coefficients is presented. The fluid lubricant is modeled as a simple barotropic fluid which is described by the Reynolds equation. The structural model includes membrane, bending, and elastic foundation effects in a general geometry. The equivalent viscous damping of the Coulomb friction caused by the foil relative motion is included in the structural calculation. Bearing stiffness and damping coefficients are predicted for an air-lubricated foil bearing with a corrugated sub-foil. The effects of the bearing number, bearing compliance, sub-foil Coulomb friction, and foil membrane stiffness on the bearing dynamic coefficients are discussed.

Copyright © 1997 by The American Society of Mechanical Engineers
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