Theoretical and Experimental Comparisons for Rotordynamic Coefficients of a High-Speed, High-Pressure, Orifice-Compensated Hybrid Bearing

[+] Author and Article Information
Nancy M. Franchek

Herrick Laboratories, Purdue University, West Lafayette, IN 47907-1077

Dara W. Childs

Turbomachinery Laboratory, Texas A&M University, College Station, TX 77843-3123

Luis San Andres

Texas A&M University, College Station, TX 77843-3123

J. Tribol 117(2), 285-290 (Apr 01, 1995) (6 pages) doi:10.1115/1.2831244 History: Received January 06, 1994; Revised July 08, 1994; Online January 24, 2008


Comparisons are presented between measurements and predictions for a 76.2 mm diameter, high-speed (24,600 rpm), high-pressure (7.0 MPa), hybrid bearings using warm (54°C) water as a test fluid. “Hybrid” refers to combined hydrostatic and hydrodynamic action. Test results are presented for an orifice-fed, square-recess configuration with five recesses. Data are provided for rotordynamic coefficients including direct and cross-coupled stiffness, direct damping, direct added-mass coefficients, and the whirl-frequency ratio. Experimental results are compared to predictions from an analysis by San Andres (1990a), which accounts for both temporal and convective acceleration terms in the fluid film. San Andres’ development uses an orifice discharge coefficient to model the pressure drop from supply pressure to recess pressure. With experimentally determined discharge-coefficient values as input, good agreement is obtained between theory and experiment. However, predictions are sensitive to changes in the orifice discharge coefficients.

Copyright © 1995 by The American Society of Mechanical Engineers
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