A three-dimensional model of gas foil bearings and the effect of misalignment on the static performance of the first and second generation foil bearings

Both foil structure and surface texturing have been widely used to improve bearing performance. However, there is little research on their combination, namely, textured gas foil bearing. This paper adopts the Reynolds equation as the pressure governing equation of bump-type foil journal bearing to study the influence of textures located on the top foil. The Newton-Raphson iterative method and the perturbation method are employed to obtain static and dynamic characteristics, respectively. Thereafter, based on three texture distribution types, further analysis about the effect of the relative texture depth and the textured portion is carried out. The results indicate that an appropriate arrangement of textures could improve the performance of gas foil bearing. For #1 texture distribution, the maximum increment of load capacity could exceed 10% when ω = 1.4 × 105 r/min, ε = 0.2.

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“…( 4). Besides, the boundary conditions 22 for the above solution process belong to the Dirichlet boundary condition, see Eq. (11).…”

Section: Numerical Analysis Methodsmentioning

confidence: 99%

Performance of textured foil journal bearing considering the influence of relative texture depth

Zhang

Han

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Three-dimensional model Zhao et al 37 recently presented a three-dimensional finite element model of GFBs, which considers the deflection variation in the axial direction. While modelling top foil, the local interaction and sagging effect was considered.…”

Section: Two-dimensional Modelmentioning

confidence: 99%

A review of thermohydrodynamic aspects of gas foil bearings

Kumar

Khamari

Behera

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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In recent times, gas foil bearings have become popular for commercial use in the aircraft and space industry, turbocompressors, turbine generators and in the more complex fields of turbochargers and turboexpanders. The gain in popularity for gas foil bearings is due to their features such as contamination-free zone, wide temperature range, higher stability and higher reliability characteristics as compared to other types of bearings. However, several challenges have come across while analysing the gas foil bearing behaviour at different working conditions. The current paper presents an overview of the work done in the past few decades for developing numerical models and listing the efforts of several researchers around the world to conduct the experimental investigation for predicting and analysing thermohydrodynamic behaviour of gas foil bearings at different operating conditions. It is expected that the current paper will help readers to thoroughly understand the hydrodynamic and thermal aspects of gas foil bearings.

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“…Shimmed gas-foil bearings (figure 17(d)) are prepared by inserting metal shims between the bearing housing and the foil structures [108]. Metal shims create multi-pad gas films Pre-loaded three-pad GFB [107] Radial preloads are increased to create a multi-pad gas film Shimmed GFBs [108] Metal shims are inserted between the bearing housing and foil structures Utilizes a compliant structure with large structural damping Flexure pivoted three-pad GFB [109] Flexure pivots are integrated into the foil structure Viscoelastic GFB [110] A viscoelastic polymer layer is inserted into the foil structure Metal mesh GFB [111] Bump foil is replaced by an annular metal mesh Double-layer bumpy GFB [105] A second bumpy layer is inserted into the foil structure…”

Section: Passive Strategies For Ensuring Rotordynamic Stabilitymentioning

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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A three-dimensional model of gas foil bearings and the effect of misalignment on the static performance of the first and second generation foil bearings

Cited by 31 publications

References 30 publications

Performance of textured foil journal bearing considering the influence of relative texture depth

Performance of textured foil journal bearing considering the influence of relative texture depth

A review of thermohydrodynamic aspects of gas foil bearings

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

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