Pressure Distribution in the Air Film and the Porous Conveyor Air Bearing

Huang, Te Yen; Shen, Song; Lin, Shih-Yang; Hsu, Su Ming

doi:10.4028/www.scientific.net/amm.479-480.380

Cited by 2 publications

(3 citation statements)

References 3 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 Various numerical methods and engineering packages have been adopted for air pressure calculations in porous bearings. Huang et al [13] analyzed the pressure in a porous conveyor air bearing using the FLUENT software. Cui et al [14] used FLUENT software to numerically analyze the effect of manufacturing errors on the load-carrying capacity and stiffness of an annular-thrust porous aerostatic bearing.…”

Section: Introductionmentioning

confidence: 99%

“…Various numerical methods and engineering packages have been adopted for ai pressure calculations in porous bearings. Huang et al [13] analyzed the pressure in a po rous conveyor air bearing using the FLUENT software. 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.…”

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%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

2021

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Experimental Study of Pressure Drop-Flow Rate Characteristics of Heated Tight Porous Materials

Liao

Zhong

et al. 2016

Journal of Fluids Engineering

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Tight porous materials are used as pneumatic components in a wide range of industrial applications. Such porous materials contain thousands of interconnected irregular micropores, which produce a large pressure drop (ΔP) between the upstream and downstream sides of the porous material when a fluid flows through it. The relationship between the pressure drop and flow rate (i.e., ΔP-G characteristics) is a very important basic characteristic. Temperature is one of the factors that affect the ΔP-G characteristics because variations in temperature change the viscosity and density of the fluid. In this study, we experimentally analyzed the ΔP-G characteristics of tight porous materials by heating them using an electromagnetic system. First, we experimentally investigated the change in the ΔP-G curve under the condition of constant heating power. Then, based on the Darcy–Forchheimer theory, we introduced an experimental method to determine the average temperature of the fluid. The results show that the temperature reaches approximately 500 K in the small flow rate range, which produces considerable changes in the ΔP-G curve. As the flow rate increases, the temperature decreases, and thus, the ΔP-G curve at constant heating power converges to the curve for the room temperature. Furthermore, we compared three porous materials with different permeability coefficients and porosities and analyzed the effect of these parameters on the ΔP-G characteristics. We also performed experiments at different downstream pressures to study the effect of the average density on the ΔP-G characteristics.

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Pressure Distribution in the Air Film and the Porous Conveyor Air Bearing

Cited by 2 publications

References 3 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

Experimental Study of Pressure Drop-Flow Rate Characteristics of Heated Tight Porous Materials

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