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Modélisation numérique et expérimentale de la lubrification des paliers de moteur soumis à des conditions sévères de fonctionnement

Abstract : Dynamically loaded bearings, like for example the IC engine bearings, have a simple geometry but a complex behaviour. Modelling all the physical phenomena that describe the behaviour of a dynamically loaded bearing is very difficult to realize and can require prohibitive computing time. The aim of this study is to help the bearing designers by proposing fast and efficient predictive tools.
The non-Newtonian and piezo-viscous effects are studied, for the complex case of a big-end connecting-rod bearing. For the investigated cases, the piezo-viscous effect is more important than the non-Newtonian effect. Two thermal models are presented: a first one, that gives a 2D temperature information in the fluid film and a second one, more elaborated, that gives a 3D temperature information. The models efficiency is demonstrated by the treatment of a big-end con-rod bearing. A comparison between the results obtained with an EHD model, two TEHD 3D models, with and without non-Newtonian effects and a “global” TEHD model is also presented and analysed.
In order to validate the theoretically and numerically models, a test bench (MEGAPASCALE) is designed to study con-rod bearings functioning in severe conditions. The obtained load (90 kN in compression and 60 kN in traction for 20000 rpm) is representative for high-speed internal combustion engine where the inertial effects are predominant. A detailed description of the original adopted solutions as well as the test bench operation conditions is presented.
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Contributor : Aurelian Fatu <>
Submitted on : Thursday, August 31, 2006 - 3:38:50 PM
Last modification on : Wednesday, March 20, 2019 - 2:14:10 PM
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Aurelian Fatu. Modélisation numérique et expérimentale de la lubrification des paliers de moteur soumis à des conditions sévères de fonctionnement. Mécanique [physics.med-ph]. Université de Poitiers, 2005. Français. ⟨tel-00090536⟩

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