Abstract
In order to further study the performance of aerostatic bearing, an aerostatic bearing with a multihole integrated restrictor was proposed in this paper. Based on the physical model of aerostatic bearings, the governing equation was established, deduced discretely, and solved numerically by the finite-difference method and flow balance principle in Cartesian coordinates. The bearing capacity and stiffness of aerostatic bearings have been analyzed, and the relevant experimental research has been carried out in this paper. The results showed that the number of orifices in the integrated restrictor had a significant effect on the bearing capacity, and the maximum bearing capacity of a nine-hole integrated throttling bearing was approximately 1.9 times greater than that of a single-hole bearing. The bearing stiffness was greatly affected by the diameter of the orifices, and the optimum bearing stiffness was determined. The corresponding gas film clearance also changed accordingly.
Highlights
Aerostatic bearings, with a high-pressure gas supplied from an external air source passing through a restrictor of the bearing surface into the gas film clearance of the bearing, generate static pressure by means of the throttling action in the gas film clearance, leading to the function of the bearing and lubrication between the bottom of the bearing body and the working surface of the guide rail support
Five orifices with a diameter d 0.2 mm are distributed on the integrated restrictor with a unit area of radius r 2 mm. e gas film pressure distribution of the aerostatic bearings is numerically solved at gas film clearances h of 10 μm, 20 μm, 30 μm, and 40 μm
With the increase in the number of orifices n and the same film clearance h, the bearing capacity W increases. e maximum bearing capacity of a nine-hole integrated throttle bearing is approximately 1.9 times that of a single-hole bearing, which shows that the number of orifices of the integrated restrictor has a significant effect on the bearing capacity
Summary
Aerostatic bearings, with a high-pressure gas supplied from an external air source passing through a restrictor of the bearing surface into the gas film clearance of the bearing, generate static pressure by means of the throttling action in the gas film clearance, leading to the function of the bearing and lubrication between the bottom of the bearing body and the working surface of the guide rail support. To suppress the vortex air flow and reduce nanovibrations of the bearings, Chen et al [15] proposed a novel design of aerostatic bearings with an arrayed microhole restrictor, which had uniformly distributed micron-sized holes in an arrayed pattern such that the total restriction area was the same as that of a single orifice restrictor and studied the eddy current and microvibration characteristics of aerostatic bearings with AMR by CFD analysis software. Is new type of bearing is equipped with a restrictor on the unit area of its working surface, and numerous microholes are integrated on the restrictor It overcame the problem of the porous throttling holes being blocked and maintained a high bearing capacity, rigidity, stability, and other properties of the porous section. The lubrication support mechanism of the aerostatic bearing with a multihole integrated restrictor is discussed, with a focus on the influence factors of the bearing capacity and stiffness of aerostatic bearings, which have been explored and studied based on parameters such as the number of orifices, the diameter of the orifices, and the throttled area of integrated restrictors. e performance test platform of aerostatic bearings was developed to carry out related experimental research, which provided a new method and a theoretical basis for the further study of the lubrication support mechanism of aerostatic bearings
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