Calculation of pressure distribution in EHD point contacts from experimentally determinated film thickness |
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Authors: | J. Molimard M. Querry P. Vergne I. Krupka M. Hartl |
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Affiliation: | aCentre SMS, ENSMSE, 158 Cours Fauriel, 42 027 Saint-Etienne, cedex 02, France;bLMC/IET, UMR CNRS/INSA n°5514, INSA bât. d'Alembert, 69621 Villeurbanne, Cedex, France;cFaculty of Mechanical Engineering, Brno University of Technology, 616 69 Brno, Czech Republic |
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Abstract: | In lubrication studies, film thickness is measured since 1963 using optical interferometry, but pressure distribution is also of great interest. Unfortunately, this parameter is very difficult to measure. This paper presents a new method for pressure evaluation based on an inverse elastic approach. This latter uses the film thickness field known precisely (±3 nm) by computerised treatment of interferograms. We present here the whole process, from the image to the pressure field. A complete error analysis is conducted: the pressure field is known within 5% and the spatial resolution is 3 grid steps, i.e. 6 μm. |
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Keywords: | Inverse analysis EHL Pressure distribution |
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