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RESEARCH PAPERS

A Study of the Stability of an Externally-Pressurized Gas-Lubricated Thrust Bearing With a Flexible Damped Support

[+] Author and Article Information
D. A. Boffey

Department of Mechanical Engineering, University of Edinburgh, United Kingdom

J. of Lubrication Tech 100(3), 364-368 (Jul 01, 1978) (5 pages) doi:10.1115/1.3453186 History: Received April 10, 1977; Revised March 22, 1978; Online October 20, 2010

Abstract

Externally-pressurized gas bearings are prone to a dynamic instability known as pneumatic hammer. This paper examines the possibility of using a flexible damped bearing support to suppress the instability. A circular thrust bearing having a central feed hole and pocket is employed in the feasibility study. The linearized gas film dynamic coefficients are derived using an adaptation of an existing solution to Reynolds equation for a long rectangular bearing. Only stability of the equilibrium position is considered. Results obtained for a support having a stiffness comparable to the stiffness of the gas film show that damping in the support can substantially improve stability.

Copyright © 1978 by ASME
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