Experimental and Theoretical Rotordynamic Characteristics of a Hybrid Journal Bearing

[+] Author and Article Information
J. T. Sawicki

Mechanical Engineering Department, Cleveland State University, 1983 East 24th Street, Cleveland, Ohio, 44115

R. J. Capaldi

NASA Lewis Research Center, Cleveland, Ohio, 44135

M. L. Adams

Department of Mechanical & Aerospace Engineering, Case Western Reserve University, Cleveland, Ohio, 44106

J. Tribol 119(1), 132-141 (Jan 01, 1997) (10 pages) doi:10.1115/1.2832446 History: Received October 31, 1994; Revised January 19, 1995; Online January 24, 2008


This paper describes an experimental and theoretical investigation of a four-pocket, oil-fed, orifice-compensated hydrostatic bearing including the hybrid effects of journal rotation. The test apparatus incorporates a double-spool-shaft spindle which permits independent control over the journal spin speed and the frequency of an adjustable-magnitude circular orbit, for both forward and backward whirling. This configuration yields data that enables determination of the full linear anisotropic rotordynamic model. The dynamic force measurements were made simultaneously with two independent systems, one with piezoelectric load cells and the other with strain gage load cells. Theoretical predictions are made for the same configuration and operating conditions as the test matrix using a finite-difference solver of Reynolds lubrication equation. The computational results agree well with test results, theoretical predictions of stiffness and damping coefficients are typically within thirty percent of the experimental results.

Copyright © 1997 by The American Society of Mechanical Engineers
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