考虑润滑油膜的深沟球轴承非线性动力学分析

摘要

针对机床中使用的深沟球轴承,考虑了油膜阻尼和油膜切向摩擦力,建立了更符合实际工况的轴承运动微分方程.通过数值方法求解得到了轴承系统在不同转速、不同波纹度幅值下的分岔图、相图、轴心轨迹图和庞加莱图,以及考虑表面凹坑的动力学参数变化,并与未考虑润滑油膜影响的计算进行了比较.结果表明,润滑油膜的存在有利于减小轴承的振动,波纹度使系统的动力学行为更加复杂,而表面凹坑则降低了轴承的运转精度.%For the deep groove ball bearings used for machine tools,the bearing differential equations of motion are es-tablished with consideration of the oil film damping and the tangential friction,which is much close to the actual working conditions.Bifurcation diagrams,phase diagrams,orbits of shaft center,and Poincare maps for the bearing-rotor system at different speeds,different waviness amplitude and dent are obtained by the numerical methods.The comparison is also con-ducted with the results without considering the effect of oil film.The results show that:the presence of the lubricant oil film tends to reduce the bearing vibration,the surface waviness makes dynamic behavior of the system be more complex,and the surface dent damages the bearing rotational accuracy.