干气密封滑动摩擦界面切向接触刚度分形模型  

Fractal Model for Tangential Contact Stiffness of Sliding Frictional Interface in Dry Gas Seals

作　　者：孙宝财[1,2] 丁雪兴 陈金林[1] 张伟政[1] 严如奇[2] SUN Baocai;DING Xuexing;CHEN Jinlin;ZHANG Weizheng;YAN Ruqi(College of Petrochemical Engineering,Lanzhou University of Technology,Gansu Lanzhou 730050,China;Gansu Province Special Equipment Inspection and Testing Institute,Gansu Lanzhou 730050,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050 [2]甘肃省特种设备检验检测研究院,甘肃兰州730050

出　　处：《摩擦学学报》2019年第1期65-72,共8页Tribology

摘　　要：为揭示干气密封滑动摩擦界面高频微幅自激摩擦振动规律,用分形参数表征摩擦界面形貌特性,根据重新建立的微凸体接触变形方式,以及对非协调弹性体在切向力作用下初始滑动问题的研究,建立了干气密封滑动摩擦界面切向接触刚度分形模型.通过数值对切向接触刚度的影响因素进行了分析,研究结果表明:切向接触刚度随分形维数、真实接触面积和材料特性系数的增大而增大;切向接触刚度随特征尺度、摩擦系数的增大逐渐减小.相比于分形维数、特征尺度和材料特性系数对切向接触刚度的影响,摩擦系数的影响相对较小.这些研究结果为进一步研究干气密封高频微幅自激摩擦振动奠定了基础.In order to reveal the self-excited frictional vibration law with high frequency and micro-amplitude of the sliding frictional interface in dry gas seals, the end face morphology of dry gas seals was characterized by fractal parameters. According to the re-established contact deformation model of the micro-convex body and the researches about the incipient sliding problem of the non-conforming elastic bodies under tangential force, the fractal model for tangential contact stiffness of dry gas seals was established. The key factors influencing the tangential contact stiffness were analyzed numerically, and the results showed that the tangential contact stiffness increased with the increased of fractal dimension, real contact area, and material properties factor. It decreased with the increased of the characteristic scale and friction coefficient. The effect of the coefficient of friction on the tangential contact stiffness was relatively small compared to the fractal dimension, the characteristic scale and the material properties factor. These researches provided a foundation for further study of the self-excited frictional vibration with high frequency and micro-amplitude in dry gas seals.

关 键 词：干气密封 滑动摩擦界面 分形理论 微凸体 切向接触刚度 

分 类 号：TH117[机械工程—机械设计及理论]