Analysis On Porous Aerostatic Bearing Static Performance

This dissertation deals with the structural design theory of the porous bearings, which aims at analyzing the porous aerostatic air bearing system. And the outcomes of the contributions can be summarized as follows:According to the pressure distribution equations and the central difference scheme, the finite difference mathematical models of aerostatic circular porous thrust bearing and porous aerostatic journal bearing are established. And then, some parameters, such as film thickness, porous material's thickness, gas supply pressure and velocity slip, which effect the static performance of circular porous thrust bearing, are analyzed. Therefore, some theoretical references for the structure design of porous thrust bearings are provided.On the basis of finite volume method, the air flow processes in aerostatic circular porous thrust bearing and porous aerostatic journal bearing are simulated by FLUENT. And the results of the finite difference model and the results based on FLUENT have good agreement, which shows that the finite difference models are right and feasible.In terms of the theory analysis for aerostatic circular porous thrust bearing and the knowledge of powder metallurgy, a mold for porous materials which have different density is designed. Used Cu and Sn powder, some porous materials with different density based on the mold are manufactured. Furthermore, the basal technical process of the porous material is analyzed. This experiment laid the foundation for next steps of the experiment of circular porous thrust bearing.The achievements stated above will greatly enrich the design theory of aerostatic porous bearing. They will also provide theoretic references for the structure design of aerostatic porous bearing and have important engineering significance.