A Parameter Identification Method for the Rotordynamic Coefficients of a High Reynolds Number Hydrostatic Bearing

[+] Author and Article Information
C. Rouvas, D. W. Childs

Turbomachinery Laboratory, Mechanical Engineering Department, Texas A&M University, College Station, TX 77843

J. Vib. Acoust 115(3), 264-270 (Jul 01, 1993) (7 pages) doi:10.1115/1.2930343 History: Received February 01, 1992; Revised July 01, 1992; Online June 17, 2008


In identifying the rotordynamic coefficients of a high-Reynolds-number hydrostatic bearing, fluid-flow induced forces present a unique problem, in that they provide an unmeasureable and uncontrollable excitation to the bearing. An analysis method is developed that effectively eliminates the effects of fluid-flow induced excitation on the estimation of the bearing rotordynamic coefficients, by using power spectral densities. In addition to the theoretical development, the method is verified experimentally by single-frequency testing, and repeatability tests. Results obtained for a bearing are the twelve rotordynamic coefficients (stiffness, damping, and inertia coefficients) as functions of eccentricity ratio, speed, and supply pressure.

Copyright © 1993 by The American Society of Mechanical Engineers
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