摘要
针对传统经验公式难以准确反映滚动轴承正常工作时油膜刚度动态变化的问题,根据滚动轴承运行时油膜状态分布,基于非Newton流体弹流润滑理论,考虑表面粗糙形貌、热效应、时变效应等因素,建立滚动轴承油膜刚度计算模型。通过数值计算,得到一个完整工作周期内油膜压力、膜厚、温度和刚度变化规律。结果表明:油膜刚度在一个周期内呈非线性变化,并随载荷、黏度、表面粗糙度幅值的增大而增大,随卷吸速度的增大而有所减小;油膜刚度的振荡频率随表面粗糙度波长和粗糙表面纹理走向与轴承滚动方向夹角增大而增大;滚动轴承正常工作时,油膜的温升最大,内圈次之,滚动体最小且不可忽略。
In view of the dynamic change of the oil film stiffness during the normal operation of rolling bearings is difficult to be accurately reflected by the traditional empirical formula,a rolling bearing oil film stiffness model based on multiparameter coupling was established,taking into account the non-Newton fluid elasto-hydrodynamic lubrication,rough surface morphology,thermal effect,time-dependent effect and other factors. The changing rules of the oil film pressure,film thickness,temperature,and oil film stiffness in a complete cycle were obtained by numerical calculations. The results show that the oil film stiffness is nonlinear in a cycle,which increases with the increasing of load,viscosity,surface roughness,and decreases with the increasing of entrainment velocity. The oscillation frequency of oil film stiffness increases with the increasing of the wavelength of surface roughness,as well as the angle between the texture direction of rough surface and rolling direction of bearing. When the bearing running,the temperature rise of the oil film is the largest,the temperature rise of the inner ring is the second,and that of the rolling body is the minimum but should not be neglected.
作者
雷春丽
李復宏
郭俊锋
杨晓燕
LEI Chunli;LI Fuhong;GUO Junfeng;YANG Xiaoyan(Key Laboratory of Digital Manufacturing Technology and Application,The Ministry of Education, Lanzhou University of Technology, Lanzhou 730050,China;School of Mechanical and Electronical Engineering, Lanzhou University of Technology,Lanzhou 730050,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第10期225-232,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(51465035
51465034)
关键词
滚动轴承
油膜刚度
表面粗糙度
热效应
时变效应
rolling bearing
oil film stiffnes
surface roughnes
thermal effect
time-dependent effect
