基于拟动力学的航空发动机主轴球轴承热弹流润滑分析  

Thermal elastohydrodynamic lubrication analysis of aero-engine mainshaft ball bearing based on quasi-dynamic

作　　者：史修江[1] 王黎钦[1] 古乐[1] 郑德志[1] 赵小力[1] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150001

出　　处：《航空动力学报》2016年第1期233-240,共8页Journal of Aerospace Power

基　　金：国家重点基础研究发展计划(2013CB632305);国家自然科学基金(51373186)

摘　　要：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.Taking aero-engine mainshaft ball bearing under typical high speed and load conditions as cases, the motion and loaded states of micro-contact region were obtained based on quasi-dynamic analysis, and the minimum film thickness （MFT） was estimated with Hamrock-Dowson （H-D） formula and ZHAI Wenjie thermal modified formula; meanwhile, the MFT under various conditions was acquired through thermal elastohydrodynamic lubrica- tion （EHL） analysis. Comparing the MFT of experiment testing, H-D, ZHAI Wenjie and numerical analysis, the EHL status was ensured by film thickness ratio. Results indicate that H-D and ZHAI Wenjie＇s MFT have large difference with experiment results, but nu- merical analysis shows a well agreement with experiment data and the error is within 10%. The operating condition effects on EHL property were discussed. Results indicate the global film pressure increases and the thickness decreases in the presence of radial load; the film pressure decreases and the thickness increases with the increase of speed, but the trend becomes slower.

关 键 词：航空发动机主轴球轴承 拟动力学 热弹流 最小膜厚 载荷 转速 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]