Analysis and Selection of Fluid-Film Bearings for Spool-Shaft Gas Turbines

[+] Author and Article Information
W. Shapiro, R. Colsher, O. Decker

The Franklin Institute Research Laboratories, Philadelphia, Pa.

J. of Lubrication Tech 92(4), 597-606 (Oct 01, 1970) (10 pages) doi:10.1115/1.3451482 History: Received March 03, 1970; Online October 18, 2010


The mechanical simplicity and damping qualities of fluid-film bearings makes them attractive possibilities for spool-shaft bearings of gas turbines. The simultaneous high-speed rotation of journal and bearing, however, causes whirl stability to be a major problem. Computerized analysis was utilized to screen a spectrum of practical candidate configurations. Stability threshold plots were expeditiously generated using accurately determined cross-coupled spring and damping coefficients to represent the bearings. Performance of each bearing type was determined as a function of configuration, ambient pressure, and machined clearance. The selected three-lobe design was further tested with a “time-transient” analysis that accurately traced a complete time history of the motions of the system in its various degrees of freedom.

Copyright © 1970 by ASME
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