Research On Design And Characteristics Of Hydrostatic Dynamic Gas Lubricated Bearing

Hydrostatic dynamic gas lubricated bearing is a new structured gas bearing, it synthesized the advantage of aerostatic and aerodynamic bearing. At the same time, It avoid those of the shortage, the non-solid-contract caused by static pressure effect avoid the dry friction, and the hydrodynamic effect brought by high speed can avoid the continued high pressure gas supply, which greatly reduced the power consumption.In this paper, the hydrostatic dynamic gas lubricated bearing was taken as a subject, and the modeling in flow field, the way of numerical analysis method, the reliability of simulation results and characteristics of the bearing were taken on in-depth research. The main research work includes:The applicability of different meshing and calculation methods on gas lubricated bearings is analysed. The thrust aerostatic bearings are chose as a subject, and the research was taken on boundary layer grid, different mesh densities and calculating models. Meanwhile, One test rig was built for measuring the pressure distribution in flow field. The result indicate:boundary layer grid can do well study on wall. Considering the calculation accuracy and efficiency, choose the division of grid partition method. When flow field have different flow mode, the hybrid model should be used, it can increase the accuracy of the calculation.The numerical calculation method was used to study the influence of structure and work state to hydrostatic dynamic gas lubricated thrust bearing. The three-dimension models of bearings are built, the boundary layer grid, division of grid partition method and hybrid model of laminar and turbulent are used in modelling. The calculation results show that:the three-dimensional calculation method can effectively calculate the flow field of bearing, and the reliability of the simulation result is verified through the contrast with design example. In flow field, part of spiral groove is turbulent flow, and the gas film part is laminar flow. Increasing the supply pressure of the static pressure work state, the load and stiffness of bearing is improved, but it also lead to the rising of gas consumption. Increasing the rotating speed of the dynamic pressure work state, the spiral groove can bring obvious hydrodynamic pressure effect, and the higher the speed is, the better hydrodynamic effect it have, but it will add system consumption and bring unstable factors.The research results provide the design theory of hydrostatic dynamic gas lubricated bearing. The data and charts in this dissertation can be referenced for designing and calculating the same kind of hydrostatic dynamic gas lubricated bearing.