An overview and assessment on aerodynamic journal bearings with important findings and scope for explorations

Pattnayak, M.R.; Ganai, P.; Pandey, R. K.; Dutt, J.K.; Fillon, M.

doi:10.1016/j.triboint.2022.107778

Cited by 38 publications

(12 citation statements)

References 245 publications

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“…Spiral and herringbone grooves improve the performance of bearings by enhancing the pumping effect [93]. Performance prediction models of herringbone grooved bearings have been developed for a long time and have delivered excellent accuracy [94].…”

Section: Grooved Aerodynamic Bearingsmentioning

confidence: 99%

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Zhang,

Huang,

Chen

et al. 2024

Int. J. Extrem. Manuf.

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Fluid lubricated bearings have been widely adopted for supporting components of high-end equipments in the field of metrology, semi-conductor, aviation, strategic defense, ultra-precision manufacturing, medical treatment and power generations. These fields all involve extreme working conditions such as ultra-high moving precision, ultra-high rotation speed, ultra-heavy bearing load, ultra-high environmental temperature, high radiation and high vacuum, which present challenges for the design and optimization of reliable fluid lubricated bearings. Breakthrough of any related bottlenecks will promote the development course of high-end equipments. To further promote the advancement of high-end equipments, this paper reviews the design and optimization of fluid lubricated bearings operated with typical extreme working performances. Targeting on the realization of extreme working perfor mances, the current challenges, the current solutions, the underlying deficiencies and the promising developing directions regarding to the design and optimization of fluid lubricat ed bearings are systematically pointed out. This paper can provide guidance for choosing suitable fluid lubricated bearings and optimizing their structures based on required extremeworking performances.

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Section: Grooved Aerodynamic Bearingsmentioning

confidence: 99%

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Zhang,

Huang,

Chen

et al. 2024

Int. J. Extrem. Manuf.

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“…In the early days, many scholars also studied the theory of gas lubrication, with the classical application being gas-lubricated bearings. [7][8][9][10] The gas film thickness is intentionally engineered to be sufficiently large in gas-lubricated bearings, ensuring that direct contact between asperities is prevented. Nevertheless, there are scenarios where direct asperity contact becomes inevitable.…”

Section: Introductionmentioning

confidence: 99%

Numerical solution of dry friction in point contact using the unified Reynolds method combined with rarefied gas effect

Zhan,

Fang,

Huang

2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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Dry friction problems are widespread in engineering applications. However, the current research on the contact pressure between interfaces mainly relies on static contact mechanics solutions, neglecting the influence of the contact pressure generated by the gases in the environment. In this paper, the ambient gas is considered as a lubricant with lubricating effects. Drawing inspiration from hydrodynamic lubrication methods, a unified mixed lubrication equation for dry friction problems is developed, taking into account the influence of gas rarefaction effects. This study computes the dry friction contact pressure under different winding speeds and loads. The advantage of this method lies in its ability to automatically distinguish between the contact and noncontact regions during the calculation process, enabling the determination of the contact pressure over the entire contact area. The computational results demonstrate that at low entrainment velocities, there is minimal deviation in contact pressure and contact area compared to Hertzian contact. However, as the entrainment velocity increases, the actual pressure-bearing area enlarges compared to static contact, and there is a smooth transition of pressure at the contact edge, which cannot be obtained from static contact analysis. Finally, the numerical solution of the contact pressure when the sliding speed spans several orders of magnitude is given, and the calculation results show that the numerical model has good robustness. This numerical approach offers valuable insights for guiding the design of air bearings in practical applications.

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“…It takes advantage of the transfer (diffusion, viscosity and thermal conductivity), adsorption and compression properties of gases. Under the fluid dynamic pressure effect, the hydrostatic pressure effect and the extrusion effect, a complete layer of gas film is formed, which reduces the friction between the frictional substrates [1,2]. Gas lubricated bearings have been employed in numerous rotating machines since the 1960s, particularly in precision machines supporting high-speed rotors, demonstrating their unique utility.…”

Section: Introductionmentioning

confidence: 99%

Research on aerodynamic performance analysis of micro radial spiral-grooved air bearing

et al. 2023

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The paper simulates and analyzes the internal gas of the spiral-groove radial air bearing. Bearing clearance pressure distribution and bearing load capacity were obtained. Under various geometrical parameters and operational circumstances, the air flow properties of air bearings were examined and contrasted. There is established a law for the variation of air flow properties. The bearing geometric parameters are optimized which affect the gas bearing pressure and bearing capacity. The research provided a useful reference for the design and optimization of the air bearings. It is found that the bearing capacity increases with the increase of eccentricity. The bearing reaches the best effect when the groove depth is 40μm and the groove number is 40.

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An overview and assessment on aerodynamic journal bearings with important findings and scope for explorations

Cited by 38 publications

References 245 publications

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Numerical solution of dry friction in point contact using the unified Reynolds method combined with rarefied gas effect

Research on aerodynamic performance analysis of micro radial spiral-grooved air bearing

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