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Modélisation expérimentale et numérique de la lubrification des paliers compliants sous chargement dynamique

Abstract : The elastic bearings lubrication such as the connecting –rod bearings must consider he hydrodynamic effects as well as the elastic deformations of the structures. In order to appreciate the validity of the existent numerical models, comparisons with real phenomena must be done. This comparisons need the employment of experimental devices and measurement methods.
In order to proceed to a comparison with numerical results, an original experimental device has been built. This device respect the connecting-rod / crankshaft kinematics and use of schematic connecting-rod models.
The used methods are the photoelasticity and the digital image correlation method. The first is used in order to visualise the stress generated by the pressure field inside the model and the second is employed to measure the lubricant film thickness.
The comparison with the numerical results shows very good agreement between the calculated and measured isochromes fringe pattern, which means that the film pressure is correctly calculated. The film thickness shows o good agreement on almost all the functioning cycle but less at 30° before and after the explosion moment. The viscoelasticity is considered to be responsible of this behaviour.
The numerical part of this work is based on the squeeze film phenomena study by the modification of existent numerical algorithm. After a comparison with an analytic study, which support the validation of the numerical code, the problem of the connecting-rod small end bearing is considered. The influence of the shaft elasticity, of the piezoviscosity of the lubricant, the location of the supply holes is studied too.
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https://tel.archives-ouvertes.fr/tel-00102599
Contributor : Virgil Optasanu <>
Submitted on : Monday, October 2, 2006 - 12:19:07 PM
Last modification on : Wednesday, March 20, 2019 - 2:14:02 PM
Long-term archiving on: : Monday, April 5, 2010 - 11:58:28 PM

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Virgil Optasanu. Modélisation expérimentale et numérique de la lubrification des paliers compliants sous chargement dynamique. Mécanique [physics.med-ph]. Université de Poitiers, 2000. Français. ⟨tel-00102599⟩

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