The design of crankshaft bearings is carried out with software using many assumptions on the geometrical and operating bearing parameters. The calculation results are thus more or less close to reality according to the assumptions used. In order to know the level of accuracy of the theoretical results, it is necessary to compare these results with those obtained by experimentation.
This paper describes the experimental measurements and the theoretical calculations of oil-film thickness in a dynamically loaded crankshaft main bearing. Four eddy current gap sensors for each bearing are used to measure the oil-film thickness and to deduce the shaft trajectories. The elastohydrodynamic model considers the bearings, housing and crankshaft elastic deformations. The calculation process uses the finite element method and the Newton-Raphson method for the numerical analysis. Comparisons of the load effects and crankshaft speed are made between the experiment and the theory.
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