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Transient thermal elastohydrodynamic lubrication of point contacts subjected to normal vibration

Transient thermal elastohydrodynamic lubrication of point contacts subjected to normal vibration PurposeVibration exists widely in all machineries working under high-speed. The unpredictability of vibration and the change of the relative surface speed may result in difficulties in the EHL analysis. By far there are few studies on EHL relating to vibration published. The purpose of the present study is to investigate the effect of the vertical vibrations and the influence of temperature on the thermal EHL contacts.Design/methodology/approachThe lubricant was assumed to be Newtonian fluid. The time–dependent numerical solutions were achieved instant after instant in each period of vibrations. At each instant, the pressure field was solved with a multi-level technique, the surface deformation was solved with a multi-level multi-integration method, and the temperature filed was solved with a finite different scheme through a sweeping progress. The periodic error was checked at each end of the vibration period until the responses of pressure, film thickness and temperature were all periodic functions with the frequency of the roller’s vibrations.FindingsThe results reveal that normal vibration produce a little drastic change of pressure, film thickness and temperature in EHL. Under some conditions, the vibrations of the roller can produce transient dimples within the contact conjunction. It is also showed that the lubrication in the same sliding is better than the opposite sliding.Research limitations/implicationsFor the unpredictability of vibration, it is no easy to do the experiment to realize a real comparison with numerical results. The reach does not show any verification and consider the effect of Non Newtonian fluid.Originality/valueThe effect of the vertical vibrations on the thermal EHL point contact hast been studied. The effects of both the amplitude and the frequency on the predicted load carrying capacity, minimum film thickness, center pressure and center temperature and the coefficient of friction were investigated. The role of the thermal effect was given. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Industrial Lubrication and Tribology Emerald Publishing

Transient thermal elastohydrodynamic lubrication of point contacts subjected to normal vibration

Industrial Lubrication and Tribology , Volume 68 (5) – Aug 8, 2016

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References (28)

Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0036-8792
DOI
10.1108/ILT-06-2015-0085
Publisher site
See Article on Publisher Site

Abstract

PurposeVibration exists widely in all machineries working under high-speed. The unpredictability of vibration and the change of the relative surface speed may result in difficulties in the EHL analysis. By far there are few studies on EHL relating to vibration published. The purpose of the present study is to investigate the effect of the vertical vibrations and the influence of temperature on the thermal EHL contacts.Design/methodology/approachThe lubricant was assumed to be Newtonian fluid. The time–dependent numerical solutions were achieved instant after instant in each period of vibrations. At each instant, the pressure field was solved with a multi-level technique, the surface deformation was solved with a multi-level multi-integration method, and the temperature filed was solved with a finite different scheme through a sweeping progress. The periodic error was checked at each end of the vibration period until the responses of pressure, film thickness and temperature were all periodic functions with the frequency of the roller’s vibrations.FindingsThe results reveal that normal vibration produce a little drastic change of pressure, film thickness and temperature in EHL. Under some conditions, the vibrations of the roller can produce transient dimples within the contact conjunction. It is also showed that the lubrication in the same sliding is better than the opposite sliding.Research limitations/implicationsFor the unpredictability of vibration, it is no easy to do the experiment to realize a real comparison with numerical results. The reach does not show any verification and consider the effect of Non Newtonian fluid.Originality/valueThe effect of the vertical vibrations on the thermal EHL point contact hast been studied. The effects of both the amplitude and the frequency on the predicted load carrying capacity, minimum film thickness, center pressure and center temperature and the coefficient of friction were investigated. The role of the thermal effect was given.

Journal

Industrial Lubrication and TribologyEmerald Publishing

Published: Aug 8, 2016

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