A Systems Approach to the Solid Lubrication of Foil Air Bearings for Oil-Free Turbomachinery

[+] Author and Article Information
Christopher DellaCorte, Antonio R. Zaldana

National Aeronautics and Space Administration, Glenn Research Center, Cleveland, OH 44135

Kevin C. Radil

U.S. Army Research Laboratory, Glenn Research Center, Cleveland, Ohio 44135

J. Tribol 126(1), 200-207 (Jan 13, 2004) (8 pages) doi:10.1115/1.1609485 History: Received January 24, 2003; Revised July 01, 2003; Online January 13, 2004
Copyright © 2004 by ASME
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Radil, K. C., and DellaCorte, C., 2000, “The Effect of Journal Roughness and Foil Coatings on the Performance of Heavily Loaded Foil Air Bearings,” NASA/TM—2000-210941.
DellaCorte,  C., and Valco,  M. J., 2000, “Load Capacity Estimation of Foil Air Journal Bearings for Oil-Free Turbomachinery Applications,” STLE Tribol. Trans., 43(1), pp. 795–801.
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Grahic Jump Location
Schematic example of typical first generation foil bearings with axially and circumferentially uniform elastic support elements: (a) leaf-type foil bearing; and (b) bump-type foil bearing.
Grahic Jump Location
Schematic of Generation III foil air bearing tested
Grahic Jump Location
Foil bearing test rig and bearing setup
Grahic Jump Location
Load capacity coefficient of as installed (not broken-in) foil bearing at 25°C, showing the synergistic effects of wear resistant (Al-Cu) foil coatings, self lubricating shaft coatings (PS304) and sacrificial overlay solid lubricants (MoS2)
Grahic Jump Location
Schematic representation of systems approach to bearing lubrication (a) conventional oil lubricated bearing, and (b) multilevel solid/gas lubricated foil air bearing



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