Numerical simulation research on cone self-acting gas lubrication bearing dynamics

An analysis of static and clearance flow characteristics for the cone self-acting gas lubrication bearing of high precision gyro motor and deduction of first order slip boundary conditions are presented. The computation fluid dynamics based on boundary conditions of no slip and the first-order slip are used to make numerical simulation of clearance complex flow for the bearing. Static loads, stiffness, powers and offset angles with different eccentricity of the bearing, the results are compared with experiment results of the bearing. Study results show that the experiment measurement results stiffness of the bearing in the weight condition are between the results of numerical simulation with no slip and first-order slip boundary conditions, experiment data less than about 10% with the calculation results from no slip boundary conditions, and more than 44% with the calculation results from first slip boundary conditions, which shows that slip phenomenon partly existed in clearance flow of the bearing. The offset angle orientation of numerical simulation is consistent with the experiment data, differences of 4° and 2.6° respectively. The research results could provide reference for the design of gas lubricated bearings of the gyroscope motor.