Abstract: An aerostatic bearing with multi-hole integrated restrictor is designed to reveal the changing law of load-bearing performance of aerostatic bearing with concentrated throttle orifices, and the load-bearing capacity and stiffness of the bearing are studied. The governing equations in polar coordinates are established based on the physical model of aerostatic bearing with multi-hole integrated restrictor. The governing equations were deduced by discrete difference method and solved numerically by finite difference method and flow balance principle, and the pressure distribution of the gas film flow field was obtained. The bearing capacity, stiffness and other performance parameters of aerostatic bearing were analyzed and verified by experiments. The results show that the film pressure of aerostatic bearing increases gradually with the decrease in air clearance. In the case of the same air clearance, the bearing capacity of bearings increases gradually as the number of throttle orifices increases and the orifice diameter increases. In the case of a certain air clearance, the bearing has the optimum stiffness. The bearing stiffness increases first and then decreases gradually with the increase in the number of throttle orifices. As the bearing supply pressure increases, the bearing capacity and optimum stiffness of aerostatic bearing increase significantly. The experimental results are in good agreement with the numerical results, which has verified the feasibility and correctness of numerical calculation and numerical method. Key

Key words: aerostaticbearing, multi-holeintegratedrestrictor, bearingcapacity, stiffness, finitedifference