Calculation of Stiffness and Damping Properties of Gas Bearings

[+] Author and Article Information
J. W. Lund

The Technical University of Denmark, Copenhagen, Denmark; Mechanical Technology Inc., Latham, N. Y.

J. of Lubrication Tech 90(4), 793-803 (Oct 01, 1968) (11 pages) doi:10.1115/1.3601723 History: Received March 19, 1968; Online August 23, 2011


The dynamic characteristics of a gas bearing can be represented by a set of spring and damping coefficients (impedances) which are functions of the static load on the bearing, the rotating speed and the whirl frequency of the journal. For a rotor supported in gas bearings, these coefficients can be used directly in a critical speed calculation or an unbalance response calculation. In addition, the coefficients can be employed in a stability investigation. The paper gives the computational method for obtaining the spring and damping coefficients and, also, describes how they are used in rotor calculations and stability studies. Numerical results are given in graphical and tabular form for a tilting pad journal bearing and a three-lobe journal bearing.

Copyright © 1968 by ASME
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