Modelling of Film Thickness and Traction in a Variable Ratio Traction Drive Rig

Sharif, Khairi; Evans, Henry Peredur; Snidle, Raymond Walter; Newall, Jonathan

doi:10.1115/detc2003/ptg-48102

Cited by 5 publications

(8 citation statements)

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“…This correlation may accurately describe the temperature and pressure, T and p , dependence of the low-shear viscosity, μ , over the temperature and pressure range of measured viscosities and, for some liquids, provide a sensible extrapolation for perhaps 300 MPa greater than the measurement pressure. It cannot, however, provide sensible extrapolations above the range of measured pressure for liquids with a low inflection pressure 11,12 and may even lack an inflection for liquids with large inflection pressure. The Yasutomi model is where Tg (p ) is the glass transition temperature which varies with pressure as …”

Section: Introductionmentioning

confidence: 99%

An improved Yasutomi correlation for viscosity at high pressure

Bair

Mary

Bouscharain

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part J:

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The Yasutomi temperature–pressure–viscosity correlation is attractive for elastohydrodynamic lubrication analysis because it does not require an equation of state for the liquid. However, the original Yasutomi correlation suffers from the appearance of a zero in the function describing the pressure dependence of the relative free volume thermal expansivity. When the original correlation is employed, a liquid with a high inflection pressure lacks the inflection in the predicted pressure–viscosity behavior and a liquid with a low inflection pressure is predicted to have two inflections. A new function removes these concerns and provides improved precision without the need for an equation of state. The improved function gives a more faithful representation of viscosity at even low pressures.

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Section: Introductionmentioning

confidence: 99%

An improved Yasutomi correlation for viscosity at high pressure

Bair

Mary

Bouscharain

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…In order to solve the TEHL problem numerically, the Equations – are solved together with the lubricant energy Equation . For this purpose, equations are made dimensionless and multilevel techniques described by Venner and Lubrecht are applied…”

Section: Comparison With Analytical and Numerical Solving Methodsmentioning

confidence: 99%

Artificial neural network approach to predict the lubricated friction coefficient

Otero

Ochoa

Tanarro

et al. 2013

Lubrication Science

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This paper analyses the applicability of artificial neural networks for predicting the lubricated friction coefficient. We will consider their use as faster and simpler alternatives to simulations based on theoretical behaviour equations. The development of several different artificial neural networks is presented. They have been trained through tribological tests on a mini‐traction‐machine, which furnishes the friction coefficient in point contacts. Once the training has been completed the networks are applied as tools for predicting the results in different operating conditions. Their advantages and disadvantages are analysed compared with conventional simulation tools. Copyright © 2013 John Wiley & Sons, Ltd.

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“…The point contact thermal EHL model used in this work is essentially that described by Sharif et al [12,13], but it is outlined here for completeness. The analysis includes both shear heating and compressive heating/cooling in its formulation, together with convective heat transfer within the oil film.…”

Section: Governing Equationsmentioning

confidence: 99%

“…Recent work has seen the thermal non-Newtonian EHL models extended to cover the analysis of worm gears [12], variable ratio transmissions [13], starved contacts [14], rough surfaces [15], and mixed lubrication conditions [16].…”

Section: Introductionmentioning

confidence: 99%

Elastohydrodynamic modelling of heat partition in rolling-sliding point contacts

Clarke

Sharif

Evans

et al. 2007

Proceedings of the Institution of Mechanical Engineers, Part J:

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This article presents the results of a series of thermal elastohydrodynamic lubrication (EHL) analyses of a set of disc experiments carried out by Patching et al. The authors have previously calculated the heat partition at each load stage from the experimental data, and the present work seeks to compare the heat partition developed in a thermal EHL analysis of the lubricant film with that calculated from the experiments. These EHL analyses show that the heat partition depends on the non-Newtonian formulation used. Only when the dissipation takes place by wall slip occurring at the faster moving surface do the heat partition results approach those determined from the experimental results. It is concluded that this combination of experimental heat partition results with associated EHL analysis can prove to be a much more discerning test of rheological behaviour in EHL contacts than is provided by measurement of traction.

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Modelling of Film Thickness and Traction in a Variable Ratio Traction Drive Rig

Abstract: The paper describes the application of a full non-Newtonian, thermal elastohydrodynamic lubrication (EHL)

Cited by 5 publications

References 0 publications

An improved Yasutomi correlation for viscosity at high pressure

An improved Yasutomi correlation for viscosity at high pressure

Artificial neural network approach to predict the lubricated friction coefficient

Elastohydrodynamic modelling of heat partition in rolling-sliding point contacts

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