Abstract
The aim of this work is to study the thermal effects of tilting-pad journal bearings during start-up. A four-shoe tilting-pad journal bearing is tested on an original device. Two theoretical approaches permit us to take into account the heat flux generated by viscous dissipation, the transient heat transfer and the viscosity variation across the film thickness: these are the thermohydrodynamic (THD) and thermoelastohydrodynamic (TEHD) models. The relevance of thermoelastic deformations is emphasized by a comparison with theoretical THD and TEHD results: a decrease in radial bearing clearance is observed. The minimum transient period is about 1 or 2 min. A very good agreement between theoretical predictions and experimental data is obtained when both the solid deformations and heat transfer in the bearing elements are considered.
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