Static and Dynamic Characteristics of Vacuum Preloaded Porous Aerostatic Bearings

Abstract

In order to further improve the bearing stiffness, the porous aerostatic bearings can obtain bidirectional stiffness without additional preload guideway by combining vacuum preloaded (VPL) technology with the bearings. To explore the influence of working conditions and structural parameters on VPL porous aerostatic bearing performance, a numerical analysis of static and dynamic characteristics was performed based on the computational fluid dynamics (CFD) method. The influences of the air supply pressure, the vacuum degree, the permeability, the vacuum suction port diameter, the perturbation amplitude and the perturbation frequency were thoroughly investigated. The analysis shows that the stiffness of VPL porous aerostatic bearings increases by 22. 34% compared with that of ordinary porous bearings, and working conditions and structural parameters have a significant influence on static and dynamic characteristics. It is expected that the results can guide performance research and optimization design for the high-stiffness aerostatic bearings.

Keywords

vacuum preloaded technology / computational fluid dynamics (CFD) / static characteristic / dynamic characteristic

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