基于有限单元热网络法的航空发动机主轴轴承热分析

An Accurate thermal prediction of main shaft roller bearings for aero-engine is key to ensure stable operation of engine lubrication system and the whole engine. Considering that traditional thermal network method is less accurate, a finite-element based thermal network method is proposed. The bearing is divided into a finite number of elements by mesh, and each element is provided with a temperature node representing lumped parameters of the element. Then thermal resistance relationship is established among adjacent nodes to form a thermal network. By solving the large sparse matrix linear equations, the temperature distribution in the cross section of roller bearing could be obtained. This method could be combined with the distributed bearing heat generation theory to achieve accurate local heat loading and precise temperature distribution analysis. By comparing with experimental results, it is found that the error of predicted centerline temperature of outer ring surface in the bearing is less than 13%.