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RESEARCH PAPERS

Dynamic Stiffness and Damping of Externally Pressurized Gas Lubricated Journal Bearings

[+] Author and Article Information
David P. Fleming, William J. Thayer, Robert E. Cunningham

Lewis Research Center and U.S. Army Air Mobility R&D Laboratory, Cleveland, Ohio

J. of Lubrication Tech 99(1), 101-105 (Jan 01, 1977) (5 pages) doi:10.1115/1.3452954 History: Received March 19, 1976; Revised June 23, 1976; Online October 20, 2010

Abstract

A rigid vertical shaft was operated with known amounts of unbalance at speeds up to 30,000 rpm and gas supply pressure ratios to 4.8. From measured amplitude and phase angle data, dynamic stiffness and damping coefficients of the bearings were determined. The measured stiffness was proportional to the supply pressure, while damping was little affected by supply pressure. Damping dropped rapidly as the fractional frequency whirl threshold was approached. A small eccentricity analysis overpredicted the stiffness by 4 to 55 percent. Predicted damping was close to measured at low speeds but higher at high speeds.

Copyright © 1977 by ASME
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