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以航空发动机主轴球轴承高速高温重载典型工况为算例,基于轴承拟动力学分析,得到滚动体与套圈之间的微接触区运动和受力状态,分别用Hamrock-Dowson(H-D)拟合公式和翟文杰热修正公式计算了最小膜厚(MFT),同时结合热弹流润滑分析得到最小膜厚分布,对比了试验测试、H-D拟合、翟文杰热修正和热弹流润滑分析4种算法的最小膜厚,并根据膜厚比判定了轴承的弹流润滑状态.结果表明:H-D拟合和翟文杰热修正最小膜厚与试验测试结果相差较远,热弹流润滑分析结果与试验数据吻合性较好,误差10%以内;探讨了不同工况下的轴承弹流润滑性能.结果表明:存在径向载荷时,润滑膜整体压力增大,膜厚减小;随着转速增大,压力减小,膜厚增大,但是增大的趋势减缓.
A typical working condition of aero-engine main shaft ball bearing at high speed and high temperature is taken as an example. Based on the pseudo-dynamic analysis of the bearing, the micro-contact zone movement and stress state between the rolling element and the ferrule are obtained. Hamrock-Dowson Fitting formula and Zhai Wenjie heat correction formula to calculate the minimum film thickness (MFT), combined with the thermo-elastic fluid lubrication analysis of the minimum film thickness distribution, compared with the test test, HD fitting, Zhai Wenjie thermal correction and thermal elastohydrodynamic lubrication analysis of four kinds The results show that the minimum film thickness of HD fitting and Zhai Wenjie heat correction is far from the test results, and the results of thermoelastic flow lubrication and experimental data The results show that when the radial load is applied, the overall pressure of the lubricating film increases and the film thickness decreases. With the increase of the rotating speed, Pressure decreases, film thickness increases, but the trend of increasing slows down.