Sommerfeld数对气体轴承动力学特性参数的影响  

Influence of Sommerfeld Number on Dynamic Characteristic Parameters of Gas Bearings

作　　者：肖云峰[1,2] 聂帅 张志莲 杜文海[1] XIAO Yunfeng;NIE Shuai;ZHANG Zhilian;DU Wenhai(School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;School of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京石油化工学院机械工程学院,北京102617 [2]北京工业大学环境与能源工程学院,北京100124

出　　处：《轴承》2020年第12期38-42,共5页Bearing

摘　　要：为研究Sommerfeld数对气体动压轴承动力学特性参数的影响,根据气体动压轴承的主要几何参数及运行参数,基于DyRoBes-Beperf软件建立气体动压轴承的计算模型,分析Sommerfeld数对偏心率、最小气膜厚度、最大气膜压力、摩擦功耗、刚度和阻尼的影响。结果表明:随Sommerfeld数的增大,偏心率逐渐减小,最小气膜厚度、最大气膜压力及摩擦功耗均有所增大,直径刚度先减小后增大,直径阻尼逐渐减小;存在一个临界Sommerfeld数,当Sommerfeld数低于该临界值时,转速对最大气膜压力影响较大,当Sommerfeld数高于临界值时,转速对最大气膜压力影响较小。In order to study the influence of Sommerfeld number on dynamic characteristic parameters of aerodynamic bearings,according to main geometric parameters and operating parameters of the bearings,the calculation model of the bearings is established based on DyRoBes-Beperf software,and the influence of Sommerfeld number on eccentricity,minimum gas film thickness,maximum gas film pressure,friction power consumption,stiffness and damping is analyzed.The results show that with the increase of Sommerfeld number,the eccentricity decreases,the minimum gas film thickness,maximum gas film pressure and friction power consumption increase,the diameter stiffness decreases first and then increases,and the diameter damping decreases gradually;There is a critical Sommerfeld value,when Sommerfeld number is lower than the critical value,the speed has a greater impact on maximum gas film pressure,when Sommerfeld number is higher than the critical value,the speed has a smaller impact on maximum gas film pressure.

关 键 词：滑动轴承 动压气体轴承 动力学分析 最小气膜厚度 气膜刚度 阻尼 Sommerfeld数 临界转速 

分 类 号：TH133.35[机械工程—机械制造及自动化]