Abstract
This paper demonstrates the modelling and simulation comparison of the static characteristics of a porous, orifice, and multiple type aerostatic thrust bearings on the basis of load-carrying capacity(LCC) and stiffness. The equations Navier-Stokes (N-S) are used to solve the internal distribution of pressure in computational fluid dynamics(CFD) simulation environment. An axisymmetric model, which minimizes the computational time and increases efficiency, is used to evaluate the static characteristics of a porous, orifice, and multiple restrictors of aerostatic bearings. Our numerical analysis and empirical results show the agreement with the significant effect of material and geometrical parameters on the LCC and stiffness. The thickness of the air film is less than 10μm, the multiple orifice restrictors have more LCC than porous and orifice restrictor. The porous restrictor's stiffness is larger than orifice and multiple restrictors. The LCC of porous and orifice is notably smaller than multiple orifice restrictors. Additionally, it is analyzed that LCC of porous, orifice, and multiple orifice restrictors can be improved with an increase in the supply of air pressure.
Highlights
INTRODUCTION TThe aerostatic bearings are used to acquire motion accuracy and minimum friction in numerous measuring machines, lithography equipment, and machine tools
WORK This work investigates the advantages and disadvantages, which are based on the factors optimization of porous and orifice type bearings
Several findings are given as follows: The stiffness of porous restrictors regularly decreases by reducing the thickness of porous; for single and multiple orifice restrictors, it slowly rises at the highest value of thickness declines with an increase of thickness of air film
Summary
INTRODUCTION TThe aerostatic bearings are used to acquire motion accuracy and minimum friction in numerous measuring machines, lithography equipment, and machine tools. Several kinds of restrictors such as porous, orifice, compound and slot usually used in aerostatic bearings. The porous bearing has an advantage over other restrictors because of its uniform pressure distribution on the surface of bearing. Due to this property, it has more force, stiffness, and stability, which are sustained by the porous material. Uichiro Nishuo et al [1] has examined the characteristics of aerostatic bearing experimentally and numerically. The co-efficient of damping and stiffness of restrictors with feed-holes are larger than compound restrictors of bearings. Cui et al [2] carried out a study on the pressure distribution of film, affected the porous aerostatic bearings by manufacturing errors. Zhanga et al [3] analyzed
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