磁流变液静压轴承设计与仿真

Design and Simulation of Hydrostatic Bearings Lubricated with Magnetorheological Fluid

为了提高静压轴承的承载能力和回转精度,提出一种基于磁流变液(Magnetorheological Fluid, MRF)润滑的静压轴承。对磁流变液静压轴承进行结构设计,并对其承载力和油膜刚度进行了计算;通过Maxwell仿真分析不同轴承材料、不同电流对静压轴承性能的影响规律;采用CFX流体仿真分析不同间隙对静压轴承承载力的影响。通过仿真分析,选择磁感应强度最大的铸铁作为轴承材料,以适应更大的负载变化,选择半径间隙为20μm以增大承载能力。通过ANSYS流固耦合仿真,验证设计的磁流变液静压轴承的优越性,相比普通静压轴承其承载力提高了11.6%,回转精度提高了17.4%。

In order to improve the bearing capacity and rotation accuracy of hydrostatic bearing, a kind of hydrostatic bearing lubricated with magnetorheological fluid was proposed.The structure of the MRF hydrostatic bearing was designed, and its bearing capacity and oil film stiffness were analyzed and calculated.The effects of different bearing materials and different current on the performance of hydrostatic bearing were analyzed by Maxwell simulation, and the influence of different clearance on the bearing capacity of hydrostatic bearing was analyzed by CFX fluid simulation.Through simulation analysis, cast iron with the largest magnetic induction strength was selected as the bearing material to adapt to greater load changes, and the radius gap of 20 μm was selected to increase the bearing capacity.Through the fluid structure coupling simulation of ANSYS,the advantages of the designed magnetorheological hydrostatic bearing were verified.Compared with the ordinary hydrostatic bearing, its bearing capacity is increased by 11.6% and the rotation accuracy is improved by 17.4%.