Modelling and Simulation of Aerostatic Thrust Bearings

Sahto, Muhammad Punhal; Wang, Wei; Imran, Muhammad; He, Linshan; Li, Hai; Gong, Wei

doi:10.1109/access.2020.2999748

Cited by 12 publications

(7 citation statements)

References 25 publications

(22 reference statements)

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“…The mass flow rate at the air supply holes are described in Refs. 9, 18, and 22. These equations were discretized using the finite difference method, 8 and the pressure in the bearing clearances were calculated by considering a continuous flow rate condition and a boundary condition.…”

Section: Numerical Calculation Methodsmentioning

confidence: 99%

Numerical study on the rotational and machining accuracy of an end-milling process with spindles supported by aerostatic bearings

Shimada

Wakabayashi

Shimoyakawa

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Aerostatic bearings are widely used for spindles in ultra-precision machining tools. These spindles consist of a pair of aerostatic thrust bearings and several aerostatic journal bearings. The rotational accuracy of aerostatic spindles depends largely on the arrangement and performance of the individual bearings, but the evaluation of the rotational accuracy is mainly carried out experimentally using a prototype machine, which poses challenges in terms of the time and cost of building a prototype. Therefore, a real need exists to evaluate the spindle characteristics by numerical calculation. In this study, we developed a method to numerically calculate the trajectory of the spindle rotator which is supported by aerostatic bearings. The method was developed to numerically investigate and determine the effects on the rotational accuracy of the spindle during end milling when the cutting force is applied to the rotating rotor. A comparison was made regarding the amount of runout of the rotating shaft when side milling was performed using a spindle with a shaft diameter of 22 mm and a small end mill with a diameter of 1 mm, concerning three different spindles with different arrangements of thrust and journal bearings. The effects of rotational speed, radial depth of cut, and the number of tool teeth on the runout of the rotating shaft were numerically verified. As a result, it was found that a spindle structure in which the thrust bearing is placed on the tool side and the journal bearing span is lengthened is desirable.

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Section: Numerical Calculation Methodsmentioning

confidence: 99%

Numerical study on the rotational and machining accuracy of an end-milling process with spindles supported by aerostatic bearings

Shimada

Wakabayashi

Shimoyakawa

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The high-pressure zone between the orifices at both ends is the main area of the guideway, and the gas flows in the direction without length [15]. The pressure distribution and gas flow direction are shown in the main area of Figure 2 as follows: Then the Navier-Stokes (N-S) equation can be simplified as:…”

Section: Calculation Of the Load Capacity Of The Main Areamentioning

confidence: 99%

Optimal Design of a Closed Rectangular Aerostatic Guideway

Wei,

Jizhu,

Mingqiang

et al. 2023

Preprint

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In view of the floating rectangular aerostatic guideway problem of low load capacity and stiffness, this paper puts forward a kind of closed rectangular aerostatic guideway and its optimized design. Firstly, the analytic calculation formula of a closed rectangular aerostatic guideway was deduced. The use of MATLAB software for the numerical simulation and the parameter influence analyses was carried out in terms of the gas supply pressure on load capacity and stiffness. A simulation model of the rectangular air bearing was also built using the Fluent software, and the model was used for simulation calculations. Secondly, the static performance of the rectangular air bearing was analyzed by analyzing the distribution position and number of orifices on its load capacity and stiffness. On this basis, the response surface optimization design method is used to analyze the variation law of the load capacity and stiffness of the air bearing under different restrictor structural parameters. Finally, the optimal design parameters for the rectangular air bearing are obtained. The simulation results show that the optimized rectangular air bearing designed in this paper has a good load capacity and stiffness of 644.58N and 63.405N N∙μm^(-1).

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“…At present, CFD software simulation is often used in the design of aerostatic bearings to obtain air film pressure, bearing capacity, gas flow rate, etc. Sahto used CFD software to simulate and solve the internal distribution of pressure of the porous, orifice, and multiple-type aerostatic thrust bearing and analyzed the influence of material and geometric parameters on stiffness and bearing capacity [8]. Yan used CFD software to simulate and analyze the influence of different shapes of pressure-equalizing grooves on bearing performance [9].…”

Section: Introductionmentioning

confidence: 99%

Design and Research of Symmetrical Multi-Throttle Thrust Hydrostatic Bearing Based on Comparative Analysis of Various Meshes

Liu

Cao²,

Zou³

et al. 2022

Symmetry

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Due to the advantages of high rotation accuracy and long life, hydrostatic air bearings are widely used in precision rotation equipment, such as machine tools and turntables. It is imperative to reasonably design the structural size of the bearing, especially as the size of the bearing in the precision turntable determines the bearing capacity of the turntable. At present, commercial CFD software is used chiefly for simulation verification for the design of air bearings. The mesh divided in the simulation calculation has a significant impact on the efficiency of the calculation and determines the accuracy of the final simulation results. Therefore, this paper takes the symmetrical multi-throttle thrust bearing in the precision turntable as the research object and compares and studies the advantages and disadvantages of sliced structured meshes, continuous structured meshes, and unstructured meshes. On this basis, simulation analysis of bearing capacity for different radial equalizing groove lengths, widths, and depths and explores the influence of the structure size of the thrust bearing on its bearing capacity. The study shows that the length and depth of the throttle groove significantly influence the bearing capacity, while the width has little influence on the bearing capacity. Therefore, under the specific cavity volume to ensure the dynamic characteristics of the bearing, the width of the throttling groove should be reduced first, and the length and depth of the throttling groove should be increased to improve the bearing capacity.

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Modelling and Simulation of Aerostatic Thrust Bearings

Cited by 12 publications

References 25 publications

Numerical study on the rotational and machining accuracy of an end-milling process with spindles supported by aerostatic bearings

Numerical study on the rotational and machining accuracy of an end-milling process with spindles supported by aerostatic bearings

Optimal Design of a Closed Rectangular Aerostatic Guideway

Design and Research of Symmetrical Multi-Throttle Thrust Hydrostatic Bearing Based on Comparative Analysis of Various Meshes

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