Article ID Journal Published Year Pages File Type
615399 Tribology International 2012 9 Pages PDF
Abstract

Within the framework of an attempt to predict friction in journal bearings reliably and accurately, the impact of neglecting the hydrodynamic pressure dependence of the lubricant in the oil-model employed in the simulation is investigated. To this task calculations are carried out with two different oil-models; namely, an extensive oil-model that includes the influence of the hydrodynamic pressure on the lubricant properties, as well as the still commonly used basic oil-model that neglects this dependence. To cover full film lubrication and mixed lubrication with significant metal–metal contact, two different lubricants (SAE40, SAE10) are studied.Calculations are conducted using a validated simulation model for dynamic loads with a maximum of up to 76 MPa that exceed typical main bearing loads found in current automotive ICEs. The results for both oil-models are compared to measurements performed on a journal bearing test rig.We find that the results obtained with both oil-models agree closely with the experimental values only for full film lubrication, while solely the extensive oil-model is able to give also reliable results for the case of mixed lubrication.

► A simulation approach is proposed to predict friction in journal bearings. ► The method covers full film and mixed lubrication. ► Investigation of the role of the lubricant model for friction prediction. ► Comparison of the results to measurements conducted on a journal bearing test-rig. ► The results from the presented model agree closely with the experimental data.

Related Topics
Physical Sciences and Engineering Chemical Engineering Colloid and Surface Chemistry
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