考虑滑移流影响的新型弹性支承微型箔片动压气浮轴承的性能分析  

Static and Dynamic Performance Analysis of a Novel Mesoscale Gas Foil Bearings Consider the Effect of Slip Flow

作　　者：冯凯[1] 王乾振 李文俊[1] 赵雪源[1] 张智明[2,3] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082 [2]同济大学汽车学院,上海201804 [3]同济大学新能源汽车工程中心,上海201804

出　　处：《机械工程学报》2017年第17期103-112,共10页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51575170);国家科技部科技支撑计划(2015BAG06B01)资助项目

摘　　要：针对新型弹性支承微型箔片动压轴承的弹性结构,提出了刚度预测模型,并搭载静态刚度测试试验台,验证了计算模型的正确性。通过耦合弹性结构刚度模型和考虑一阶滑移流的雷诺方程,研究了在滑移流影响下的轴承的静、动态特性。发现在定转速下,随着载荷的增加,滑移流对于轴承的偏心率和最小气膜厚度的影响逐渐增大;随着转速的增加轴承刚度逐渐增加,阻尼则逐渐减小;在滑移流影响下轴承刚度减小,阻尼增加。弹性支承结构的厚度和单元个数对于静动态结果影响明显。A stiffness model of the elastic foundation was carried out and a test rig was built to test the stiffness of the elastic layer. The test results confirmed the predictions. Static and dynamic performance of the bearing was predicted by coupling the stiffness model of the elastic foundation and the Reynolds equation which considering first order slip flow. Predictions show that the effects of slip flow become significant as the load increase. Dynamic stiffness coefficients increase as speed increase, whereas dynamic damping coefficients show opposite trend. The dynamic stiffness coefficients decrease when considering the effects of slip flow, while the dynamic damping coefficients increase. Moreover, the thickness and number of the elastic foundation influence the static and dynamic performance significantly.

关 键 词：微型空气箔片轴承 有限差分法 滑移流 静动态特性 

分 类 号：TH133[机械工程—机械制造及自动化]