Transient elastohydrodynamic analysis of elliptical contacts. Part 1: Isothermal and Newtonian lubricant solution

Author:

Jin Z. M.1,Yang P1,Cui J2,Dowson D3

Affiliation:

1. University of Bradford School of Engineering, Design and Technology Bradford, UK

2. Qingdao Institute of Architecture and Engineering Department of Mechanical Engineering Qingdao, People's Republic of China

3. University of Leeds School of Mechanical Engineering Leeds, UK

Abstract

Transient elastohydrodynamic lubrication of general elliptical point contacts was analysed in the present study based on multi-level techniques. Both entrainment directions along the major and minor axes of the contact ellipse were considered, together with transient load and speed impulses. In this study, only a Newtonian lubricant and isothermal conditions were assumed. The computing time required for a typical case took only approximately 2 h on a personal computer with a 2.8 GHz central processing unit. The predicted film thickness and the pressure were found to be mainly governed by the squeeze-film or separation actions. A sudden load increase resulted in an increase in the contact conjunction and a significant development of the squeeze-film action. Consequently the lubricant film thickness was increased initially around the inlet region and then moved along in the entraining direction towards the exit. A significant increase in the predicted central film thickness was observed, long after the load impulse had ceased. Such a process was found to be mainly governed by the time period of the impulse, and the time taken for the lubricant to move through the contact conjunction in the entraining direction. The speed impulse had similar effects. However, a sudden speed decrease was found to have negligible effect on the predicted film thickness, due to the powerful squeeze-film action.

Publisher

SAGE Publications

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering

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