基于有限元方法的液体动静压主轴系统数字化分析

轴承的支撑特性与主轴系统的动态特性直接影响着磨削加工质量,液体动静压主轴系统的动态特性主要体现在轴承的支撑刚度与阻尼.首先使用流体动力学分析技术对液体动静压轴承进行不同参数下的油膜承载能力、油膜温度场分析,进而使用动网格技术对油膜支撑刚度与阻尼进行分析.然后将所得到的支撑刚度与阻尼转化为等效模型应用到主轴系统动态特性有限元分析中,对主轴系统进行动态特性分析.最后采用实验方法测量主轴系统固有频率以验证分析方法的正确性.

Digital Analysis of Hybrid Bearing Spindle System Based on FEM

The supporting characteristics of the hybrid bearings and the dynamic characteristics of the spindle system have a direct impact on the quality of grinding process.The dynamic characteristics of the spindle system are mainly dependent on the supporting stiffness and damping of the hybrid bearing.First,the oil film load capacity and temperature fields of the hybrid bearings are analyzed by using CFD method under different parameters,and the supporting stiffness and damping are then obtained with the "Moving Grid" technology.The results are then received into the equivalent stiffness and damping model,which is used in the finite element analysis of the dynamic characteristics of the spindle system.Finally,the natural frequency of the spindle system is measured to verify the validity of the analysis method.