The influences of bump foil structure parameters on the static and dynamic characteristics of bump-type gas foil bearings

Xu, Helan; Yang, Jiapeng; Gao, Lei; An, Qi

doi:10.1177/1350650120912609

Cited by 10 publications

(7 citation statements)

References 24 publications

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“…(2) The second discretization scheme [36] This scheme adopted the short second-order accurate finite difference formulas to achieve the discretization, and the intermediate nodes such as (i + 1/ 2, j) in figure 3 would participate in the calculation. Moreover, equation ( 14) could be derived accordingly.…”

Section: Two Discretization Schemes Of Nonlinear Reynolds Equation Ba...mentioning

confidence: 99%

Analysis of misalignment characteristics for textured foil journal bearing based on multigrid method

Xu,

Zhang,

Han

et al. 2023

Surf. Topogr.: Metrol. Prop.

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Surface texturing is an excellent solution to the load capacity deficiency of foil journal bearings. However, it will also introduce significant discretization efforts. This paper explored the possibility of searching the static balance locus of textured foil journal bearing using the multigrid method to ensure design efficiency. The modified Reynolds equation characterized the ultra-thin gas film behavior inside bump-type foil bearing, and two foil models were adopted simultaneously to obtain the foil’s structural deflection. The predicted load capacity agreed well with the experimental data. The results indicate that multigrid can accelerate the solution process of the compressible pressure governing equation, and the speed can be increased up to 70% when the nonlinear discretization scheme is adopted. It is recommended that textures are located in the pressure-rising region along the shaft’s rotating direction and that the axial direction is fully textured to improve load capacity. Moreover, the above texture distribution scheme can increase the tolerable maximum misalignment angle by 11.8% and enhance the stability of rotors operated in light-load and high-speed cases.

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Section: Two Discretization Schemes Of Nonlinear Reynolds Equation Ba...mentioning

confidence: 99%

Analysis of misalignment characteristics for textured foil journal bearing based on multigrid method

Xu,

Zhang,

Han

et al. 2023

Surf. Topogr.: Metrol. Prop.

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“…This design will be especially important in precision sliding machines. Static and dynamic characteristics of impact gas-film bearings are considered in [2]. A model of deformation of foil with a protrusion has been created using the theory of elasticity.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Revealing deformation of segments and their supports in a hydrostatic segmental bearing

Nazin

2021

EEJET

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At present, there are theoretical and experimental studies of such bearings without taking into account the elastic deformation of the bearing segments. The rotor bearings of powerful turbines at nuclear power plants are subjected to loads as high as tens of tons. One of the important issues in designing segmental bearings operating under these conditions consists in taking into account elastic deformations of the segments. A schematic diagram of a segmental hydrostatic bearing was presented and the principle of its operation was described. When determining the deformation of spherical support, a formula of change in volume of a solid steel ball subjected to uniform pressure was applied. To determine the segment deformation in the axial direction, differential equation of bending of the strip beam as the initial one. The basic equation of deformation of rods with a curved axis acting in the plane of curvature was taken as a starting point of determining the segment deformation in the circumferential direction. It was found in the studies that the maximum deformation of the segment is 4.5 % of radial clearance at a feed pressure of 5 MPa and can affect the bearing characteristics. A substantially nonlinear character of deformations along the segment axis was revealed. It was found that the pressure of the working fluid significantly affects the segment thickness. With an increase in feeding pressure from 1 MPa to 10 MPa, the thickness of the steel segment increased more than 2 times and the thickness of the bronze segment increased more than 3 times. It was established that the pressure of the working fluid exceeding 10 MPa substantially affects the deformation of the spherical support and the bearing clearance. The study results will make it possible to determine more accurately the main characteristics of the segmental bearing and design it more efficiently.

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“…With the deepening of research, scholars have proposed more new models. [24][25][26][27][28][29] These models are closer to reality. Using these models, the effects of different factors such as shaft misalignment, 24 foil structure parameters, 25 foil nonlinear deformation, 26 double-layer foil, 27 rotor system, 28 wear morphology and initial surface 29 on bearing performance are considered.…”

Section: Introductionmentioning

confidence: 99%

“…[24][25][26][27][28][29] These models are closer to reality. Using these models, the effects of different factors such as shaft misalignment, 24 foil structure parameters, 25 foil nonlinear deformation, 26 double-layer foil, 27 rotor system, 28 wear morphology and initial surface 29 on bearing performance are considered. However, the current research mainly focuses on normal air foil bearings, and these models cannot be applied to all air foil bearings.…”

Section: Introductionmentioning

confidence: 99%

Development and performance research of a new-type air foil bearing with combined bump foils

Shao,

Xu,

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this paper, a new-type air foil bearing with combined bump foils is proposed. The bump foils are arranged and combined in the axial direction. The local and global stiffness of the bearing can be adjusted by the combination of the bump foils. Mechanical analysis of the bearing is carried out, and the mechanical model of the elastic deformation of the flat foil and the bump foils is constructed. Combined with non-isothermal Reynolds equation and energy equation, a fluid–solid coupling numerical calculation model is constructed. Through the actual bearing test research, the reliability of the established theoretical model is verified. On this basis, combined with the specific example, the influences of the structural parameters of the new-type foil bearing on its mechanical properties and lubrication performance are studied, and the specific influence curves are obtained. It is also found that the new-type bearing proposed in this paper has good adaptability to the shaft deflection. When the shaft is deflected, the bump foil at the axial end increases the minimum film height by generating large elastic deformation, which can help to avoid wear caused by direct contact between the shaft and the foil.

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The influences of bump foil structure parameters on the static and dynamic characteristics of bump-type gas foil bearings

Cited by 10 publications

References 24 publications

Analysis of misalignment characteristics for textured foil journal bearing based on multigrid method

Analysis of misalignment characteristics for textured foil journal bearing based on multigrid method

Revealing deformation of segments and their supports in a hydrostatic segmental bearing

Development and performance research of a new-type air foil bearing with combined bump foils

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