Effect of the deformation of porous materials on the performance of aerostatic bearings by fluid-solid interaction method

Wang, Wei; Cheng, Xuhao; Zhang, Min; Gong, Wei; Cui, Hui

doi:10.1016/j.triboint.2020.106391

Cited by 32 publications

(6 citation statements)

References 22 publications

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“…The total number of cases was 13000. The steps in the differences (12)(13)(14)(15)(16)(17)(18)(19) were ∆t x = ∆t y = 0.00025 • , and…”

Section: Resultsmentioning

confidence: 99%

“…Cui et al [14] used FLUENT soft ware to numerically analyze the effect of manufacturing errors on the load-carrying ca pacity and stiffness of an annular-thrust porous aerostatic bearing. In addition, the defor mation of porous thrust bearings was numerically investigated based on the fluid-solid interaction method by Wang et al [15]. Van Ostayen et al [16] used the COMSOL softwar for active aerostatic bearing analysis.…”

Section: Introductionmentioning

confidence: 99%

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Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings

2021

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Aerostatic bearings are widely used in high-precision devices. Partial arc annular-thrust aerostatic porous journal bearings are a prominent type of aerostatic bearings, which carry both radial and axial loads and provide high load-carrying capacity, low air consumption, and relatively low cost. Spindle shaft tilting is a resource-demanding challenge in numerical modeling because it involves a 3D air flow. In this study, the air flow problem was solved using a COMSOL software, and the dynamic coefficients for tilting degrees of freedom were obtained using finite differences. The obtained results exhibit significant coupling between the tilting motion in the x-and y-directions: cross-coupled coefficients can achieve 20% of the direct coefficient for stiffness and 50% for damping. In addition, a nonlinear behavior can be expected, because the tilting motion within 3°, tilting velocities within 0.0012°/s, and relative eccentricity of 0.2 have effects as large as 20% for direct stiffness and 100% for cross-coupled stiffness and damping. All dynamic coefficients were fitted with a polynomial of eccentricity, tilting, and tilting velocities in two directions, with a total of six parameters. The resulting fitting coefficient tables can be employed for the fast dynamic simulation of the rotor shaft carried on the proposed bearing type.

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“…The total number of cases was 13000. The steps in the differences (12)(13)(14)(15)(16)(17)(18)(19) were ∆t x = ∆t y = 0.00025 • , and…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings

2021

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“…Duan and Xu [13] verified that aerostatic thrust bearing made up of multi-microporous stainless steel plate had higher LCC by comparing experiments and CFD simulations. 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.…”

Section: Introductionmentioning

confidence: 99%

Structure design and performance analysis of aerostatic thrust bearing with compound restrictors

et al. 2022

MATEC Web Conf.

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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.

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“…The restrictor that controls the flow velocity is the key component in the air bearing, but a classic orifice-type restrictor limits its stability and precision due to a gas hammer effect [4]. Porous restriction can achieve a more uniform pressure distribution on the bearing's surface, and as such is receiving more and more attention [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Rational Design and Porosity of Porous Alumina Ceramic Membrane for Air Bearing

Xiao

et al. 2021

Membranes

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Air bearing has been widely applied in ultra-precision machine tools, aerospace and other fields. The restrictor of the porous material is the key component in air bearings, but its performance is limited by the machining accuracy. A combination of optimization design and material modification of the porous alumina ceramic membrane is proposed to improve performance within an air bearing. Porous alumina ceramics were prepared by adding a pore-forming agent and performing solid-phase sintering at 1600 °C for 3 h, using 95-Al2O3 as raw material and polystyrene microspheres with different particle sizes as the pore-forming agent. With 20 wt.% of PS50, the optimum porous alumina ceramic membranes achieved a density of 3.2 g/cm3, a porosity of 11.8% and a bending strength of 150.4 MPa. Then, the sintered samples were processed into restrictors with a diameter of 40 mm and a thickness of 5 mm. After the restrictors were bonded to aluminum shells for the air bearing, both experimental and simulation work was carried out to verify the designed air bearing. Simulation results showed that the load capacity increased from 94 N to 523 N when the porosity increased from 5% to 25% at a fixed gas supply pressure of 0.5 MPa and a fixed gas film thickness of 25 μm. When the gas film thickness and porosity were fixed at 100 μm and 11.8%, respectively, the load capacity increased from 8.6 N to 40.8 N with the gas supply pressure having been increased from 0.1 MPa to 0.5 MPa. Both experimental and simulation results successfully demonstrated the stability and effectiveness of the proposed method. The porosity is an important factor for improving the performance of an air bearing, and it can be optimized to enhance the bearing’s stability and load capacity.

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Effect of the deformation of porous materials on the performance of aerostatic bearings by fluid-solid interaction method

Cited by 32 publications

References 22 publications

Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings

Parameter Sensitivity Analysis on Dynamic Coefficients of Partial Arc Annular-Thrust Aerostatic Porous Journal Bearings

Structure design and performance analysis of aerostatic thrust bearing with compound restrictors

Rational Design and Porosity of Porous Alumina Ceramic Membrane for Air Bearing

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