线接触弹流润滑最小油膜厚度综合对比分析

Aiming at the pitch circle position of a spur gear in an aeroengine，considering the thermal effect of elastohydrodynamic lubrication，the effects of velocity parameters（^-u），load parameters（^-w）and material parameters（^-g）on isothermal solution and thermal solution were studied. Three empirical formulas widely used to calculate the minimum oil film thickness under isothermal conditions are compared and analyzed. It is found that the error between the isothermal solution and thermal of elastohydrodynamic lubrication calculated by the formula of Грубин and Dowson is large within the working conditions studied in this paper. Yang’s formula has a small error in isothermal solution and thermal solution under low velocity or moderate load parameters，which can be directly used to predict the minimum oil film thickness of line contact in some working conditions. All three isotherm empirical formulas overestimate the effect of load parameters. The relative error of 10% is taken as the boundary between the quantized isothermal solution and thermal solution，and the reference range of each dimensionless parameter is given.