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RESEARCH PAPERS

Model-Based Investigation of Friction During Start-Up of Hydrodynamic Journal Bearings

[+] Author and Article Information
A. Harnoy

Department of Mechanical Engineering, New Jersey Institute of Technology, Newark, NJ 07102

J. Tribol 117(4), 667-673 (Oct 01, 1995) (7 pages) doi:10.1115/1.2831533 History: Received March 01, 1994; Revised January 17, 1995; Online January 24, 2008

Abstract

An analysis is developed for the time-variable friction during the start-up of a rotor system. The analysis is based on a dynamic friction model that has been developed from the theory of unsteady lubrication and can describe the observed friction characteristics. The model reduces to the Stribeck curve of friction versus steady velocity, and shows hysteresis curves in oscillating velocity. The “Dahl effect” of a presliding displacement before the breakaway is also included. The results indicate that the friction characteristics and energy friction losses, during the start-up, depend on a set of dimensionless parameters that represent the bearing as well as the dynamic system. The study shows that appropriate design and operation can prevent stick-slip friction and minimize wear during start-up.

Copyright © 1995 by The American Society of Mechanical Engineers
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