F. S. Guerrieri Paleotti, B. Scheichl:
"Elasto-Hydrodynamic Lubrication of Machine Elements: the Benefits of the Homogenisation Technique";
Talk: Symposium 2013 der Österreichischen Tribologischen Gesellschaft (ÖTG), FH Johanneum, Graz; 11-28-2013; in: "Symposium 2013 - Automotive Tribology", F. Franek, A. Pauschitz (ed.); Österreichische Tribologische Gesellschaft, Wien (2013), ISBN: 978-3-901657-46-7; 149 - 156.
Machine elements widely used in the automotive industry such as gears, roller bearings and cams operate under elasto-hydrodynamic lubrication (EHL) conditions. The performance of the EHL mechanism strongly depends on both the macroscopic geometry of the contact as well as on the microscopic length scales of the roughness. Homogenisation is a rigorous method which provides a proper means for the description of the lubrication mechanism for largely arbitrary roughness patterns. This analysis is of interest in all the applications in which a proper evaluation of the film thickness is required. Most important, it allows one to surmount the limits of other (classical) approaches, notably the statistical one (ambiguities in the definition of the dimensions of the cell problem and in its boundary conditions are avoided) and the deterministic one (by considerably less computational effort).
elasto-hydrodynamic lubrication, Hertzian contact, homogenisation, hypoid gears, surface roughness
http://publik.tuwien.ac.at/files/PubDat_228270.pdf