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RESEARCH PAPERS

The Complete Determination of Squeeze-Film Linear Dynamic Coefficients From Experimental Data

[+] Author and Article Information
J. Ellis, J. B. Roberts

School of Engineering and Applied Sciences, The University of Sussex, Brighton, Sussex, BN1 90T, UK

A. Hosseini Sianaki

Department of Mechanical Engineering, University of Sheffield, Sheffield, S10 2TN, UK

J. Tribol 112(4), 712-724 (Oct 01, 1990) (13 pages) doi:10.1115/1.2920320 History: Received February 28, 1990; Revised July 11, 1990; Online June 05, 2008

Abstract

This paper describes the use of the State Variable Filter (SVF) method of parametric identification to estimate the complete set of twelve linear hydrodynamic coefficients for a squeeze-film bearing system. Simulated force and displacement data are used to assess the algorithm and issues such as noise tolerance, the influence of sample time interval and input signal complexity are investigated. Real experimental data from a squeeze-film rig are processed by the SVF method and the technique used to derive linearized model coefficients is explained. For the first time, all twelve coefficients in the general linear model are estimated from experimental data. Tables and graphs are used to present the coefficient values. Sixteen parameters (including four parameters relating to initial conditions) are identified in each experiment. The direct coefficients show the same trends and orders of magnitude reported in earlier and simpler tests, relating to a single-degree-of-freedom system. The damping cross-terms are found to be virtually zero whereas the inertial and stiffness cross-terms appear to be significantly nonzero.

Copyright © 1990 by The American Society of Mechanical Engineers
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