混合润滑结合面法向接触刚度模型研究  

Normal contact stiffness model of mixed lubrication joint surface

作　　者：兰国生[1] 冀成龙 李祥 李声祺 李勇 杨琦 LAN Guosheng;JI Chenglong;LI Xiang;LI Shengqi;LI Yong;YANG Qi(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学机械工程学院,太原030024

出　　处：《振动与冲击》2023年第17期220-227,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51275328);山西省自然科学基金(20160lDoll062);山西省‘1331’工程重点学科建设资助项目。

摘　　要：在实际工作中,机械结合面一般加入润滑介质来减少磨损,因此将结合面微凸体等效为圆锥微凸体,并基于分形理论和改进的W-M函数建立混合润滑状态下结合面法向接触刚度三维分形模型。对模型进行模拟仿真,仿真结果表明:结合面无量纲法向接触总刚度随着分形维数的增大呈现出先增大后减小的趋势,且在分形维数为2.6附近时取得最大值;随着分形粗糙度参数的增大而减小;随着润滑介质的声阻抗增大而增大;混合润滑状态下结合面无量纲法向接触总刚度大于无润滑介质结合面无量纲法向接触刚度;最后与其他模型和试验数据进行对比,模型与试验数据更契合,验证了模型的正确性。混合润滑粗糙表面法向接触刚度模型的提出,为结合面的刚度预测和机械设备的性能优化以及结构改进提供良好的依据。In practical work,lubricating medium is generally added to mechanical joint surface to reduce wear.Here,a micro convex body of joint surface was equivalent to a conical micro convex body,and a 3-D fractal model for normal contact stiffness of joint surface under mixed lubrication was established based on the fractal theory and improved W-M function.The model was used to perform simulation.The simulation results showed that the non-dimensional normal contact total stiffness of joint surface firstly increases and then decreases with increase in fractal dimension,and the maximum value is obtained when fractal dimension is around 2.6;with increase in fractal roughness parameter,it decreases;with increase in acoustic impedance of lubricating medium,it increases;the non-dimensional normal contact total stiffness of joint surface under mixed lubrication is larger than that without lubricating medium;compared with other models and experimental data,the model established here is more consistent with experimental data to verify its correctness;the proposal of the normal contact stiffness model for mixed lubrication rough surface can provide a good basis for predicting joint surface stiffness,optimizing performance of mechanical equipment and improving its structure.

关 键 词：混合润滑 法向接触刚度 圆锥微凸体 结合面 

分 类 号：TH113.1[机械工程—机械设计及理论]