论文部分内容阅读
以D1842926航空发动机主轴滚子轴承典型工况为算例,基于拟动力学分析结果,获得滚动体与套圈之间的接触微区运动和受力状态,分别用Hamrock-Dowson(H-D)拟合公式,Wilson-Sheu(W-S)热修正公式和热弹流数值法得到最小膜厚,并与试验测试数据进行了对比,结果表明,H-D最小膜厚误差非常大,W-S热修正最小膜厚比H-D误差要小,但误差仍在40%以上,文中数值结果与试验数据较为一致,误差10%以内;对比不同速度下三种算法的最小膜厚分布,低速时三者较为一致,随着速度的提高,H-D最小膜厚误差越来越大,而W-S最小膜厚在速度增大到一定程度后反而降低;随着径向载荷的增大,润滑膜压力增大,膜厚减小,两端的压力略高于中间;随着转速增大,润滑膜膜厚增大,压力基本没有变化。
Taking D1842926 aero-engine main spindle roller bearing as an example, based on the results of quasi-dynamic analysis, the contact micro-area movement and stress state between the rolling element and the ferrule were obtained and fitted with Hamrock-Dowson (HD) Formula, Wilson-Sheu (WS) heat correction formula and thermo-elastic numerical method were used to obtain the minimum film thickness. Compared with the experimental data, the results show that the minimum HD film thickness error is very large, The error is smaller, but the error is still above 40%. The numerical results are consistent with the experimental data, the error is within 10%. Comparing the minimum film thickness distribution of the three algorithms at different speeds, the three are more consistent at low speed, Increase, the minimum thickness error of HD is bigger and bigger, while the minimum thickness of WS is lower after the speed increases to a certain extent; With the increase of radial load, the pressure of lubricating film increases, the film thickness decreases, The pressure is slightly higher than the middle; as the speed increases, the lubricating film thickness increases, the pressure is basically no change.