波箔动压气体轴承建模中典型摩擦模型的对比分析  

Comparative Analysis on Typical Friction Models in Modeling of Bump Foil Aerodynamic Bearings

作　　者：周如能 顾永鹏 任革学[3] 于溯源[1] ZHOU Runeng;GU Yongpeng;REN Gexue;YU Suyuan(Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China;School of Aerospace Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学能源与动力工程系,北京100084 [2]清华大学核能与新能源技术研究院,北京100084 [3]清华大学航天航空学院,北京100084

出　　处：《轴承》2022年第10期25-32,共8页Bearing

基　　金：国家重点研发计划资助项目(2018YFB2000100,2020YFB901401)。

摘　　要：波箔动压气体轴承箔片结构中的摩擦直接决定了其等效刚度和阻尼特性,进而影响轴承性能。对比分析了全耦合求解框架系统建模中常用的LuGre动态摩擦模型和平滑近似代数摩擦模型在程序实现、稳态特性以及性能预测方面的差异,结果表明:LuGre动态摩擦模型可以准确地表征黏着状态,预测结果准确,且计算效率较高,但会增加系统自由度,导致程序实现复杂;平滑近似代数摩擦模型不会增加系统自由度,程序实现简单,且在低速准静态或低摩擦因数、大扰动等以滑移为主的工况下预测结果准确,但由于无法准确表征黏着状态,在高摩擦因数、小扰动等以黏着为主的工况下预测结果偏差较大,且计算效率较低。The friction in foil structure of bump foil aerodynamic bearings determines the equivalent stiffness and damping characteristics of foil directly,thus affects the performance of the bearings.The differences in program implementation,steady-state characteristics and performance prediction between LuGre dynamic friction model and smooth approximate algebraic friction model commonly used in system modeling of fully coupled solution framework are analyzed comparatively.The results show that:LuGre dynamic friction model characterizes the adhesion state accurately,the prediction results are accurate,and the computational efficiency is high,but it will increase the degree of freedom of the system and lead to complex program implementation;smooth approximation algebraic friction model will not increase the degree of freedom of the system,the program implementation is simple,and the prediction results are accurate under low-speed quasi-static or slipping-dominated(low friction coefficient,large disturbance and so on)conditions,but it cannot characterize the adhesion state accurately,the prediction result has a large deviation under adhesion-dominated(high friction coefficient,small disturbance and so on)conditions,and the computational efficiency is low.

关 键 词：滑动轴承 气体动压轴承 波箔轴承 摩擦 黏着 滑移 

分 类 号：TH133.31[机械工程—机械制造及自动化] O313.5[理学—一般力学与力学基础]