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TECHNICAL NOTES

Performance of Damaged Hydrostatic Bearings: Predictions Versus Experiments

[+] Author and Article Information
Thomas Soulas

Rotordynamics Engineer, Dresser-Rand, Paul Clarke Drive, Olean, NY 14760-0560

Luis San Andrés

J. Tribol 125(2), 451-456 (Mar 19, 2003) (6 pages) doi:10.1115/1.1497361 History: Received February 18, 2002; Revised May 07, 2002; Online March 19, 2003
Copyright © 2003 by ASME
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References

Bently, D. E., Eldridge, T., and Jensen, J., 2001, “Externally Pressurized Bearings Allow Rotor Dynamic Optimization,” Proceedings of the 1st International Conference in Rotordynamics of Machinery, ISCORMA1, Paper 3018.
Childs, D., 2001, “Stability Insights from Hybrid Bearing Research at Texas A&M University Turbomachinery Laboratory,” Proceedings of the 1st International Conference in Rotordynamics of Machinery, ISCORMA1, Paper 3016.
San Andrés,  L., 1995, “Thermohydrodynamic Analysis of Fluid Film Bearings for Cryogenic Applications,” AIAA Journal of Propulsion and Power, 11, pp. 964–972.
Yang,  Z., San Andrés,  L., and Childs,  D., 1995, “Thermohydrodynamic Analysis of Process Liquid Hydrostatic Bearings in Turbulent Regime,” ASME J. Appl. Mech., 62, pp. 674–684.
Childs,  D., and Hale,  K., 1994, “A Test Apparatus and Facility to Identify the Rotordynamic Coefficients of High Speed Hydrostatic Bearings,” ASME J. Tribol., 116, pp. 337–344.
Kurtin,  K., Childs,  D., San Andrés,  L., and Hale,  K., 1993, “Experimental Versus Theoretical Characteristics of a High Speed Hybrid (Combination Hydrostatic and Hydrodynamic) Bearing,” ASME J. Tribol., 115(1), pp. 160–169.
Franchek,  N., and Childs,  D., 1994, “Experimental Test Results for Four High-Speed, High-Pressure, Orifice-Compensated Hybrid Bearings,” ASME J. Tribol., 116(2), pp. 285–290.
Mosher, P., and Childs, D., 1994, “Theory Versus Experiment for the Effect of Pressure Ratio on the Performance of an Orifice-Compensated Hybrid Bearing,” ASME Design Engineering Technical Conference, DE-Vol 84-2, Vol. 3-Part B, pp. 1119–1129.
Franchek,  N., Childs,  D., and San Andrés,  L., 1995, “Theoretical and Experimental Comparisons for Rotordynamic Coefficients of a High-Speed, High-Pressure, Orifice-Compensated Hybrid Bearings,” ASME J. Tribol., 117(2), pp. 285–290.
San Andrés,  L., and Childs,  D., 1997, “Angled Injection—Hydrostatic Bearings, Analysis and Comparison to Test Results,” ASME J. Tribol., 119(1), pp. 179–187.
Laurant, F., and Childs, D. W., 2000, “Measurements of Rotordynamic Coefficients of Hybrid Bearings With: (A) A Plugged Orifice, and (B) A Worn Land Surface,” ASME Paper 2000-GT-398.
Hirs,  G. G., 1973, “A Bulk-Flow Theory for Turbulence in Lubricating Films,” ASME J. Lubr. Technol., 95, pp. 135–146.
Launder,  B., and Leschziner,  M., 1978, “Flow in Finite Width Thrust Bearings Including Inertial Effects,” ASME J. Lubr. Technol., 100, pp. 330–345.
Van Doormaal,  J. P., and Raithby,  D., 1984, “Enhancements of the SIMPLE Method for Predicting Incompressible Fluid Flows,” Numer. Heat Transfer, 7, pp. 147–163.
Laurant, F., Phillips, S., and Childs, D., 1998, “Experimental Rotordynamic Coefficient Results for a Five-Pocket 80-Mil-Depth Square-Recess Smooth-Land Straight-Orifice Medium-Clearance Hybrid Bearing With a Plugged Orifice,” Technical Report No. TL-B&C-6-98, Turbomachinery Laboratory, Texas A&M University System, College Station, TX.
Laurant, F., Phillips, S., and Childs, D., 1998, “Experimental Rotordynamic Coefficient Results for a Five-Pocket 80-Mil-Depth Square-Recess Smooth-Land Straight-Orifice Medium-Clearance Hybrid Bearing With Wear-on-the-Land,” Technical Report No. TL-B&C-7-98, Turbomachinery Laboratory, Texas A&M University System, College Station, TX.

Figures

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(a) Schematic view of hydrostatic bearing with plugged orifice; and (b) schematic view of hydrostatic bearing with worn land pattern
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Reference and plugged-orifice bearings. Flow rate Q versus rotor speed/supply pressure configuration (centered rotor position)
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Reference and plugged-orifice bearings: direct stiffness coefficient KXX versus rotor speed/supply pressure configuration (centered rotor position)
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Reference and plugged-orifice bearings: cross-coupled stiffness coefficient −KYX versus rotor speed/supply pressure configuration (centered rotor position)
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Reference and plugged-orifice bearings: direct damping coefficient CYY versus rotor speed/supply pressure configuration (centered rotor position)
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Reference and plugged-orifice bearings: direct inertia coefficient MYY versus rotor speed/supply pressure configuration (centered rotor position)
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Reference and plugged-orifice bearings: whirl frequency ratio WFR versus rotor speed/supply pressure configuration (centered rotor position)
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Reference and worn-land bearings: flow rate Q versus rotor speed/supply pressure configuration (centered rotor position)
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Reference and worn-land bearings: direct stiffness coefficient KXX versus rotor speed/supply pressure configuration (centered rotor position)
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Reference and worn-land bearings: cross-coupled stiffness coefficient KXY versus rotor speed/supply pressure configuration (centered rotor position)
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Reference and worn-land bearings: direct damping coefficient CXX versus rotor speed/supply pressure configuration (centered rotor position)
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Reference and worn-land bearings: whirl frequency ratio WFR versus rotor speed/supply pressure configuration (centered rotor position)

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