Influence of the number of feeding holes on the performances of aerostatic bearings

Chen, Cheng‐Hsien; Yuan, Kun; Yang, Ding-Wen; Hwang, Rey-Chue; Shyr, Shyh-Shyong

doi:10.1108/00368791011034539

Cited by 19 publications

(15 citation statements)

References 13 publications

(13 reference statements)

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“…The orifice diameter is in the range of 0.15-0.3 mm; the air film thickness is in the range of 5-20 mm; and the orifice numbers are 4, 6, 8, and 10. Besides, to guarantee the restrictor is pocketed orifice type, the chamber depth h 1 should satisfy equation (9). Hence, for certain orifice diameter and the air film thickness, the chamber depth is designed at d/ 4 À h þ 0.005.…”

Section: Optimization Resultsmentioning

confidence: 99%

“…Plenty of works have been done to numerically investigate the performance of air bearings. [7][8][9] Some research works investigated the performance of air bearing considering multiphysics coupling effect. Gao et al 10 numerically investigated the performance of high-speed air spindle considering the interaction between thermal field, fluid field, electromagnetic field, and spindle structure.…”

Section: Introductionmentioning

confidence: 99%

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Optimal design of an annular thrust air bearing using parametric computational fluid dynamics model and genetic algorithms

Gao

Chen

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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The performance of air bearing is highly influenced by the geometrical parameters of its restrictor. This study aims to maximize the load-carrying capacity and stiffness of air bearing, and minimize its volume flow rate by optimizing the geometrical parameters of restrictor. To facilitate the calculation of air bearing performance, a parametric computational fluid dynamics model is developed. Then, it is combined with multiobjective optimization genetic algorithm to search the Pareto optimal solutions. Furthermore, as a case study, the optimal design of an annular thrust air bearing is implemented. The stiffness of air bearing is improved 38.5%, the load-carrying capacity is improved 33.9%, and the volume flow rate is declined 19.6%, which are finally validated by experiments. It proves the reliability of proposed parametric computational fluid dynamics model and genetic optimization algorithm.

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Section: Optimization Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal design of an annular thrust air bearing using parametric computational fluid dynamics model and genetic algorithms

Gao

Chen

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…substituting equations (9) to (12) into equation 8and applying FDM to the partial derivative terms, equation 13 ð Þ is developed as follow…”

Section: Numerical Analysismentioning

confidence: 99%

“…Chen et al numerically investigated the influence of the number of feedholes on the aerodynamic journal bearings. 12 It was concluded that bearings with many feedholes were not suitable for high-speed applications because the backflow phenomena could easily be induced by the hydrodynamic pressure, independent of the eccentricity. Chen et al investigated numerically the stability performance of rotor-aerostatic journal bearing.…”

Section: Introductionmentioning

confidence: 99%

Investigation on backflow phenomenon in the aerostatic journal bearing

Chen

Bao

Mills

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this work, the backflow phenomenon exhibited in the gas journal bearings is investigated. The effect of operational parameters such as eccentricity ratio ɛ, axial velocity of the bearing vz, misalignment angles [Formula: see text] and [Formula: see text] on the backflow behavior, and load force and axial friction force of the bearing are studied numerically. The differential transformation method and finite difference method are utilized to solve the dimensionless Reynolds equations required in the analysis. The performance parameters such as pressure distribution, gas flow rate, load force, and axial friction force are examined in the numerical simulations. The investigation reveals that when the bearing is operated in normal working zone, the load force F increases significantly with an increase in eccentricity ɛ; however, F may only increase slightly when the bearing operates in the backflow zone. It is suggested that the pressure Ps should be set greater than 5.0, Pc smaller than or equal to 3.0 to avoid the backflow behavior. The axial friction force [Formula: see text] is largely determined by the pressure [Formula: see text], and increases as pressure Pc increases.

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“…Compared with conventional bearings, such as oil bearing and ball bearings, gas bearings have superior advantages resulting from their lubrication low friction, high accuracy, high-speed abilities, and long working life and have a wider application in precision machines and the high-speed turbomachinery. [1][2][3][4][5][6] Additionally, compared with self-acting gas bearings, aerostatic bearings with external pressure can overcome the shortcoming of the low load capacity due to the lower viscosity of gaseous lubrication. However, aerostatic bearings tend to be instable state under high-speed condition, which limits the application of aerostatic bearings.…”

Section: Introductionmentioning

confidence: 99%

Comparison study of misalignment effect along two perpendicular directions on the stability of rigid rotor-aerostatic journal bearing system

Zhang

Zhao

Zou

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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Under misalignment condition, the film thickness distribution of aerostatic journal bearings is changed comparing with condition without misalignment, which results in the change of performances of aerostatic journal bearings. In the paper, the effects of misalignment along two perpendicular directions (along the vertical direction θ y and along the horizontal direction θ x) on the dynamic coefficients and stability thresholds of both critical whirl ratio and critical inertial force calculated by the motion equation of rigid rotor-aerostatic journal bearing system are studied comparatively. The results indicate that the dynamic coefficients, critical whirl ratio, and critical inertial force are more sensitive to θ x compared with θ y. Moreover, the stability threshold of whirl ratio reduces with increasing the misalignment degree, while stability threshold of inertial force increases with increasing the misalignment degree.

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Influence of the number of feeding holes on the performances of aerostatic bearings

Cited by 19 publications

References 13 publications

Optimal design of an annular thrust air bearing using parametric computational fluid dynamics model and genetic algorithms

Optimal design of an annular thrust air bearing using parametric computational fluid dynamics model and genetic algorithms

Investigation on backflow phenomenon in the aerostatic journal bearing

Comparison study of misalignment effect along two perpendicular directions on the stability of rigid rotor-aerostatic journal bearing system

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