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RESEARCH PAPERS

Evaluation of Dynamic Coefficients of a Two-Lobe Journal Bearing Using an Electrical Analogy Approach

[+] Author and Article Information
Har Prashad

BHEL, Corporate R&D Division, Vikasnagar, Hyderabad-500 593, India

J. Tribol 118(3), 657-662 (Jul 01, 1996) (6 pages) doi:10.1115/1.2831588 History: Received February 16, 1994; Revised August 10, 1995; Online January 24, 2008

Abstract

A theoretical approach to evaluating capacitance, resistance, capacitive reactance, and impedance of the lower and upper lobes of a two-lobe elliptical hydrodynamic journal bearing under various operating conditions is developed. It is established that the change in capacitance and resistance with the change in eccentricity ratios is nonlinear. The capacitance and resistance, thus determined, are correlated with the dynamic coefficients of bearings using an electrical analogy. It is found that the stiffness and damping coefficients are higher for two-lobe bearings as compared to those of cylindrical bearings having identical dimensional parameters and operating under similar conditions. The analysis may have the potential to diagnose the stability regime of a bearing through the bearing’s electrical parameters. The electrical analogy may be a useful alternative to conventional techniques.

Copyright © 1996 by The American Society of Mechanical Engineers
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