Abstract
Aerostatic thrust bearing compensated by multi-orifices and porous material restrictor simultaneously is proposed to improve the static performance of the bearing. Load Carrying Capacity (LCC), stiffness and the flow field characteristics of the bearing are obtained by Computational Fluid Dynamic (CFD) simulation. The influences of supply pressure, orifice number, orifice diameter, orifice distribution, porous material thickness and permeability coefficient on the bearing performance are analysed. It is indicated that LCC and stiffness of the bearing with compound restrictors are much higher than those of the bearing with porous material restrictor or multi-orifice restrictor if gas film thickness is in rational range. The bearing with compound restrictors has better stability than that of the bearing with multi-orifice restrictor. Moreover, the optimum bearing parameters with compound restrictors are given to improving the performance of aerostatic thrust bearing.
Highlights
Aerostatic thrust bearing is widely used in ultra-precision machining and measuring equipment because of its advantages of high speed, ultra-precision and slight friction
Ishibashi et al [2] compared experiments with the static and dynamic characteristics of downsized aerostatic bearing obtained by Computational Fluid Dynamic (CFD) simulations and those acquired by solving Reynolds equation
A new type of high Load Carrying Capacity (LCC) aerostatic thrust bearing with compound restrictors is proposed
Summary
Aerostatic thrust bearing is widely used in ultra-precision machining and measuring equipment because of its advantages of high speed, ultra-precision and slight friction. Wang et al [14] studied influences of supply pressure, porous material thickness and Young’s modulus on the deformation and static performance of aerostatic porous bearing by adopting fluid-structure interaction method. Wu and Tao [15] researched the static performance of aerostatic thrust bearing with porous material restrictor They reported that stiffness could be increased by reducing porous permeability coefficient. Gao et al [22] analysed the effects of air chamber shapes on the performance of high speed aerostatic spindle by CFD They concluded that LCC and stiffness varied with air chamber structure clearly. The influences of the supply pressure, orifice number, orifice diameter, orifice distribution, porous material thickness, porous material permeability coefficient and porous material diameter on bearing performance are discussed
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