Implementation of Time-Transient and Step-Jump Dynamic Analyses of Gas-Lubricated Bearings

[+] Author and Article Information
W. Shapiro

Friction and Lubrication Laboratory, The Franklin Institute Research Laboratories, Philadelphia, Pa.

R. Colsher

The Franklin Institute Research Laboratories, Philadelphia, Pa.

J. of Lubrication Tech 92(3), 518-529 (Jul 01, 1970) (12 pages) doi:10.1115/1.3451459 History: Received August 04, 1969; Online October 18, 2010


The dynamic analysis of gas-bearing systems are discussed from two points of view. The “Time-Transient” method which has been previously reported in a number of papers [1] [2] couples the lubrication and dynamic equations and integrates forward in time, to provide a time history of the motions of the system in its various degrees of freedom. The “Step-Jump” approach determines the system response due to a sudden impulse from an assumed stable operating position. The two theoretical approaches are discussed qualitatively. Implementation is presented by way of sample problems, including a fixed and resiliantly mounted hybrid journal bearing system and an elastic gimbal mounted Rayleigh-Step thrust bearing. The advantages, disadvantages and complementary characteristics of each method are presented. Details of the Step-Jump analysis for the hybrid bearing are included as an Appendix.

Copyright © 1970 by ASME
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