针对液体静压主轴运动过程中动态特性问题,研究微尺度下油膜滑移对轴承承载力,刚度及动态刚度的影响。把微尺度下发生的速度滑移引入到油膜性能方程中,结合液体静压主轴系统平衡方程推导出了主轴系统承载力、刚度及动态刚度表达式,研究了油膜初期主轴静动态性能及油膜动刚度特性。从仿真结果中得到油膜滑移的发生使得承载力及刚度增大,最大刚度对应油膜厚度减小。最后刚度检测试验间接得出了实际主轴系统油膜流动过程中,存在油膜微滑移现象。本项研究为液体静压主轴微尺度下油膜滑移现象及性能的研究探索了一条新途径。
For the problem of dynamic characteristics of the hydrostatic spindle in the process of movement, the impact that oil film slip on bearing capacity, stiffness and dynamic stiffness is researched. Introducing the velocity slip boundary conditions, the hydrostatic spindle load-bearing characteristic equation combined with liquid flow equation form a coupling equation system. The bearing capacity, stiffness and dynamic stiffness of spindle system are numerically analyzed. The spindle static and dynamic properties and oil film dynamic stiffness characteristics are researched in the initial stage of oil film. It is concluded that the occurrence of oil film slip results in the increase of bearing capacity and stiffness from the simulation results, the corresponding oil film thickness with the maximum stiffness is reduced. The existence of slip phenomenon is obtained in the oil film flow process of spindle system. This study explores a new way for the analysis of hydrostatic spindle oil film static and dynamic performance and the research of dynamic stiffness.
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