轴承供气压力对静压气体轴承-转子系统的临界转速影响的研究  

Effects of bearing air supply pressure on critical speed of an aerostatic bearing-rotor system

作　　者：韩中合[1] 侯栋楠 赵建宏 朱霄珣[1] HAN Zhonghe;HOU Dongnan;ZHAO Jianhong;ZHU Xiaoxun(School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China)

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《振动与冲击》2019年第9期246-251,共6页Journal of Vibration and Shock

基　　金：国家科技支撑计划(2014BAA06B01)

摘　　要：对静压气体轴承的流场模型建立、刚度计算作了分析与探讨。采用计算流体动力学(CFD)软件对气体轴承的流场进行仿真,根据仿真结果,建立基于支持向量机(SVM)的气体轴承性能模型,根据该模型计算气体轴承的刚度。在此基础上建立气体轴承-转子的有限元模型,利用有限元软件ANSYS对转子系统进行了模态分析。在考虑轴承刚度随供气压力和转速的变化下,计算转子系统的临界转速。结果表明该转子系统一、二阶临界转速对供气压力变化较为敏感,三阶临界转速不受此影响。该结果对静压气体轴承-转子系统中通过调整供气压力,避免在工作频率范围发生共振现象的产生有实际意义。Here, the flow field model of an aerostatic bearing and the calculation method of bearing stiffness were proposed. The bearing’s flow field was simulated with the software CFD (computational fluid dynamics). According to simulation results, the bearing’s performance model was built based on the support vector machine (SVM). This model was used to calculate the bearing’s stiffness. Then the finite element (FE) dynamic model for an aerostatic bearing-rotor system was established, and the FE software ANSYS was used to do modal analysis of the rotor system. Considering changes of bearing stiffness with variation of air supply pressure and rotating speed, the critical speed of the rotor system was calculated. The results showed that the 1st and 2nd order critical speeds of the rotor system are more sensitive to bearing air supply pressure while air supply pressure doesn’t affect the 3rd one;the results are helpful for avoiding resonance phenomena of the aerostatic bearing-rotor system within the range of working frequency through adjusting bearing air supply pressure.

关 键 词：静压气体轴承 支持向量机 轴承供气压力 有限元分析 临界转速 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3