Bearing Capacity Analysis of Spherical Hybrid Gas Bearings with Tangential Gas Supply

摘要

In order to research the static performances of the spherical spiral groove hybrid gas bearings, the lubrication analysis mathematical model of spherical hybrid gas bearings is established with variable tangential angels of gas supply. Subsequently, the mathematical model is transformed by derivatives and integrals methods and finite difference method. Homogeneous coordinate system of hybrid gas bearings is established in this process, and transformation with angle retained and oblique coordinate transformation are employed to the mathematical model. The difference expressions of gas film stable pressure control equations are established. The method of dividing grids is employed to the solution region, so the stable pressure distribution of gas film is numerically calculated by using VC++6.0 software. The bearing capacity is obtained by integration of gas film circumferential and radial pressure. The influence law of supply pressure and supply tangential angle on bearing capacity is researched in different eccentricity and speed. The results show that parameters of gas bearings need to be chosen properly to get better bearing capacity.