Improvement of calcuration on mixing inlet temperatures in bearing thermo-hydrodyanamic lubrication analysis and its evaluation

Abstract

In this study, we intended to predict bearing temperature of oil bath tilting bearings with high degrees of accuracy, and developed a more detailed formula estimating mixing temperature at the inlet of the oil film on the pad. In order to consider the complicated flow in terms of the fluid and heat between pads, we precisely solved the conservation laws of the flow and energy at the control volume adding effects of rise of temperature due to agitation loss and leak between the shaft and the seal, and we got the accurate temperature of the mixing inlet oil. Moreover, we measured the bearing temperature distributions under various conditions with a test bearing bored 280mm in diameter to validate the analysis. Eventually, we got the following conclusions. (1) Compared with the analysis using the conventional model, the proposed model can reduce the errors of the oil film temperature distribution by one third. (2) In terms of prediction of the mixing inlet temperature that affects degrees of precision of the oil film distribution, the proposed model can improve 2 ^oC of variability and 10 ^oC of average errors, compared with He's model, and it found the fact that the method can improve the accuracy of the calcuration of bearing temperature. (3) The proposed model can predict temperature at the evaluation point within -8.6~+5.4 ^oC.