The simulation of the non-stationary response of the journal bearings used in combustion engines plays a signifi cant role in the bearing design process. Diverse simulation models contain various oil viscosity defi nitions taking pressure and temperature into consideration. However, viscosity dependence on the shear rate is often neglected. Within this paper, a bearing simulation model including the shear rate-dependent viscosity is described. The modifi ed Cross equation was used to describe shear rate infl uence on viscosity. Numerical modelling of the main crankshaft bearing of a modern four-cylinder gasoline engine was performed. Selected calculation results were discussed and conclusions drawn. The modelling and calculation were carried out using the AVL software EXCITE (AVL LIST GmbH, Advanced Simulation Technology, Hans-List-Platz 1, Graz, Austria 8020). Copyright
Experimental investigations of pressures, temperatures, and film thicknesses in pure rolling elastohydrodynamic contacts have been made in a two-disk apparatus. Transducers for pressure, gap, and temperature measurements were applied by an evaporation technique. Measurements were made over a range of speeds, loads, and oil inlet temperatures with oils having various pressure-viscosity coefficients. The predicted film thicknesses and shape of the pressure profile (including the secondary pressure peak) agree well with the experimental observations as inlet viscosity, pressure viscosity coefficient, and load are varied.
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