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TECHNICAL BRIEFS

Defects of the Classic Formulation of a Nonsteady EHL Problem for a Journal Bearing. New Problem Formulation

[+] Author and Article Information
Ilya I. Kudish

Science & Mathematics Department, Kettering University, 1700 W. Third Avenue, Flint, MI 48504

Frank Kelley, Daniel Mikrut

Caterpillar, Inc., P.O. Box 1875, Peoria, IL 61656

J. Tribol 121(4), 995-1000 (Oct 01, 1999) (6 pages) doi:10.1115/1.2834168 History: Received November 12, 1998; Revised March 08, 1999; Online January 24, 2008

Abstract

A nonsteady problem for an elastohydrodynamically lubricated (EHL) journal bearing is considered. It is shown that under certain circumstances contact pressure and shaft normal velocity are discontinuous functions of time. The initial normal velocity of the shaft has a certain value which is predetermined by the shaft initial position and applied load. Therefore, the EHL solution cannot accommodate any different initial normal velocity of the shaft. These defects pertain to any nonsteady EHL problem in the “classic” formulation. The main goal of this paper is to propose a modified formulation of the EHL problem free from the above defects. For purely squeezed lubrication film an analytical and numerical analysis of a dynamic bearing response to abrupt changes in external load is performed based on the classic and “modified” problem formulations leading to discontinuous and smooth solutions, respectively.

Copyright © 1999 by The American Society of Mechanical Engineers
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