摘要
由于空气静压主轴气膜厚度处于微米级别,而主轴中的不平衡现象会影响轴承内的气膜厚度变化,因而需要对各微尺度影响因素综合考虑,并对影响主轴不平衡的各因素进行充分考虑才能真实反映主轴内的气膜流动状态,仿真出轴承的静态性能。充分考虑影响主轴不平衡的各因素并对传统雷诺方程进行修正,研究黏度、流量因子、速度滑移3个微尺度因子及转子偏心和制造误差对轴承静态性能的影响,并通过实验验证从而实现对空气静压主轴静态特性的真实预测和分析。结果表明:3个微尺度因子中,速度滑移对轴承气体压力分布影响最大,同时考虑3个微尺度因子时更能反映轴承气膜流动真实状态;转子偏心与制造误差耦合时,随转子偏心率增大,轴承中各节流孔附近的气膜压力分布与气膜刚度差异越来越大,将严重影响轴承气膜刚度。
Since the thickness of the air film in the aerostatic spindle is at the micron level,and the imbalance in the spindle will affect the change of the air film thickness in the bearing,it is necessary to consider all the micro-scale influencing factors comprehensively,and to fully consider all the factors affecting the spindle imbalance in order to truly reflect the flow state of the air film in the spindle and simulate the static performance of the bearing.The traditional Reynolds equation was modified by consider the microscale influencing factors to obtain the real situation of gas flow in the bearing.The effects of three microscale influencing factors,the viscosity,flow factor,speed slip,rotor eccentricity and manufacturing error on the static performance of the bearing were studied.Through experimental verification,the real prediction and analysis of the static characteristics of the aerostatic bearing were realized.The results show that among the three microscale influencing factors,the velocity slip has the greatest influence on the pressure distribution of the bearing.When three microscale influencing factors are considered at the same time,it can better reflect the real state of bearing film flow.When rotor eccentricity is coupled with manufacturing error,with the increase of rotor eccentricity,the difference between the gas film pressure distribution and the gas film stiffness near each orifice in the bearing becomes larger and larger,which will seriously affect the gas film stiffness of the bearing.
作者
陈东菊
何亚中
孙锟
李天宝
田汉青
CHEN Dongju;HE Yazhong;SUN Kun;LI Tianbao;TIAN Hanqing(Mechanical Industry Key Laboratory of Heavy Machine Tool Digital Design and Testing,Department of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;Haite Garden Primary School,Shijingshan District,Beijing 100041,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2022年第8期47-58,共12页
Lubrication Engineering
基金
国家重点研发计划项目(2020YFB2010001)
甘肃省高等学校创新基金项目(2020A-197)
甘肃省自然科学基金项目(21JR7RA775)。
关键词
微尺度因子
转子偏心
制造误差
静态特性
micro-scale factor
rotor eccentricity
manufacturing error
static characteristics
