Theoretical and Experimental Comparisons for Rotordynamic Coefficients of a High-Speed, High-Pressure, Orifice-Compensated Hybrid Bearing-Reference-Cited by-同舟云学术

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

Published:1995-04-01 Issue:2 Volume:117 Page:285-290
ISSN:0742-4787
Container-title:Journal of Tribology
language:en
Short-container-title:

Author:

Franchek Nancy M.¹,Childs Dara W.²,San Andres Luis³

Affiliation:

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

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

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

Abstract

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.

Publisher

ASME International

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials

Link

http://asmedigitalcollection.asme.org/tribology/article-pdf/117/2/285/5938050/285_1.pdf

Reference19 articles.

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2. Bendat, J. S., and Piersol, A. G., 1986, Random Data: Analysis and Measurement Procedures, 2nd ed., Wiley Intersciences, New York.

3. Braun M. J. , AdamsM. L., and MullenR. L., 1984, “Analysis of a Two Row Hydrostatic Journal Bearing with Variable Properties, Inertia Effects, and Surface Roughness,” Israel Journal of Technology, Vol. 22, No. 5, pp. 155–164.

4. Butner, M. F., and Murphy, B. T., 1986, “SSME Long Life Bearings,” Rockwell International, Rocketdyne Division, NASA Report No. CR179455.

5. Chaomleffel J. P. , and NicholasD., 1986, “Experimental Investigation of Hybrid Journal Bearings,” Tribology International, Vol. 19, No. 5, pp. 253–259.

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