Established high temperature operation of gas foil bearings (GFB) is of great interest for gas turbine applications. The effects of (high) shaft temperature on the structural stiffness and mechanical energy dissipation parameters of a foil bearing (FB) must be assessed experimentally. Presently, a hollow shaft warmed by an electric heater holds a floating second generation FB that is loaded dynamically by an electromagnetic shaker. In tests with the shaft temperature up to , the measurements of dynamic load and ensuing FB deflection render the bearing structural parameters, stiffness and damping, as a function of excitation frequency and amplitude of motion. The identified FB stiffness and viscous damping coefficients increase with shaft temperature due to an increase in the FB assembly interference or preload. The bearing material structural loss factor best representing mechanical energy dissipation decreases slightly with shaft temperature while increasing with excitation frequency. Separate static load measurements on the bearing also make evident the preload of the test bearing-shaft system at room temperature. The loss factor obtained from the area inside the hysteresis loop of the static load versus the deflection curve agrees remarkably with the loss factor obtained from the dynamic load measurements. The static procedure offers substantial savings in cost and time to determine the energy dissipation characteristics of foil bearings. Post-test inspection of the FB reveals sustained wear at the locations, where the bumps contact the top foil and the bearing sleeve inner surface, thus, evidences the bearing energy dissipation by dry friction.
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March 2011
Research Papers
Identification of Structural Stiffness and Energy Dissipation Parameters in a Second Generation Foil Bearing: Effect of Shaft Temperature
Luis San Andrés,
Luis San Andrés
Mast-Childs Professor
Fellow ASME
Department of Mechanical Engineering,
e-mail: lsanandres@tamu.edu
Texas A&M University
, College Station, TX 77843
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Keun Ryu,
Keun Ryu
Research Assistant
Department of Mechanical Engineering,
Texas A&M University
, College Station, TX 77843
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Tae Ho Kim
Tae Ho Kim
Senior Research Scientist
Energy Mechanics Research Center,
Korea Institute of Science and Technology
, 39-1 Hawolgok-dong, Songbuk-gu, Seoul 136-791, Korea
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Luis San Andrés
Mast-Childs Professor
Fellow ASME
Department of Mechanical Engineering,
Texas A&M University
, College Station, TX 77843e-mail: lsanandres@tamu.edu
Keun Ryu
Research Assistant
Department of Mechanical Engineering,
Texas A&M University
, College Station, TX 77843
Tae Ho Kim
Senior Research Scientist
Energy Mechanics Research Center,
Korea Institute of Science and Technology
, 39-1 Hawolgok-dong, Songbuk-gu, Seoul 136-791, Korea
J. Eng. Gas Turbines Power. Mar 2011, 133(3): 032501 (9 pages)
Published Online: November 11, 2010
Article history
Received:
April 6, 2010
Revised:
July 8, 2010
Online:
November 11, 2010
Published:
November 11, 2010
Citation
San Andrés, L., Ryu, K., and Kim, T. H. (November 11, 2010). "Identification of Structural Stiffness and Energy Dissipation Parameters in a Second Generation Foil Bearing: Effect of Shaft Temperature." ASME. J. Eng. Gas Turbines Power. March 2011; 133(3): 032501. https://doi.org/10.1115/1.4002317
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