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RESEARCH PAPERS

Stability and Transient Characteristics of Four Multilobe Journal Bearing Configurations

[+] Author and Article Information
D. F. Li

Department of Mechanical and Aserospace Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, Va. 22901

K. C. Choy

Joy Manufacturing Company, Cambridge, Ontario

P. E. Allaire

Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, Va. 22901

J. of Lubrication Tech 102(3), 291-298 (Jul 01, 1980) (8 pages) doi:10.1115/1.3251514 History: Received July 31, 1978; Revised February 05, 1979; Online November 17, 2009

Abstract

Multilobe journal bearings are often used to improve the stability response of rotating machinery. Such machines operate near the stability threshold of the bearing-rotor system. This work determines the linearized stability threshold of four multilobe journal bearings: elliptical, offset elliptical, three lobe, and four lobe. A nonlinear transient analysis of a rigid rotor in each of these bearings is carried out above and below the threshold speed. Shaft orbits and bearing forces are calculated. A numerical fast Fourier transform analysis is used to obtain the frequency content of the nonlinear orbit.

Copyright © 1980 by ASME
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