A Finite Element Model for Static Performance Analysis of Gas Foil Bearings Based on Frictional Contacts

Zhao, Xu; Xiao, Shuhong

doi:10.1080/10402004.2020.1836294

Cited by 13 publications

(4 citation statements)

References 33 publications

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“…The research object of these improved models is the bump foil, while ignoring the influence of the flat foil. In the study of flat foil, the beam model [21][22][23] is often used to couple it with the model of bump foil, but the beam model ignores the influence of the change of the contact relationship between the flat foil and the bump foil in the axial direction. With the deepening of research, scholars have proposed more new models.…”

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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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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“…A GDFB is an ideal research object that is strengthened by the aeroelastic interaction between a gas film and a foil assembly. Several scientists pointed out that the aeroelastic mechanism became more complicated with the increased rotating speeds and decreased rigidity of the foil assembly [25][26][27][28]. With an increase in the rotating speed, the critical speed and ultimate load capacity increased, and the deformation of the foil assembly decreased.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Gas Dynamic Foil Bearings Conjugated with Contact Friction by Elastic Multi-Leaf Foils

et al. 2023

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With increasing demand for load capacity and dynamic responses, the new generation of Gas Dynamic Foil Bearings (GDFB), assembled from preloaded elastic multi-leaf foils, has been put forward. It exhibits steady and dynamic characteristics that are more sensitive to the contact friction produced by foil–foil bearings and the housings of foil bearings, distinguishing its response to rigidity from those of classic bearings. This study aims to employ numerical simulations to explore GDFBs conjugated with contact friction using elastic multi-leaf foils. A numerical method with Bidirectional Fluid–Structure Interactions (BFSIs), which strengthens the steady and dynamic characteristics of GDFBs, has been developed. The results showed that the distribution of steady stiffness was closely associated with the configuration of the foil assembly and the state of contact friction. The maximum steady stiffness occurred near the key blocks and was accompanied by the support of bump foils. The contact friction increased the stiffness of the foil assembly, which was unfavorable to its operational stability, and the GDFB was prone to rigidity. The contact friction hindered the pull-back of the top foils near the negative pressure area. An increase in the rotational speed and eccentricity increased the load capacity while decreasing the operational stability. The maximum pressure of the gas film was inconsistent with the maximum deformation along the circumferential direction because of the configuration of the foil assembly. The contact friction induced energy dissipation, whereas increases in the integrated stiffness inhibited loss. The fixed constraint of the key block increased the dynamic cross-stiffness more than the contact constraint did, which was unfavorable to operational stability. The results obtained in this study are significant because they provide a physical basis for GDFBs and can be used to guide their operational optimization.

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“…The study results demonstrate that multiple bump deflection is observed for one loading distribution. Similarly, several other researchers considered friction contact within foil structural configuration for predicting the accurate performance of foil bearings [10,11].…”

Section: Introductionmentioning

confidence: 99%

Modelling, analysis and optimization of design parameter of bump-type gas foil journal bearing

Mourya¹,

Bhore²

2022

Eng. Res. Express

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The bump-type gas foil bearing (GFB) is widely used in various high-speed oil-free turbomachinery due to its extra features such as high-speed capability without any external oil lubricant. Under the high-speed condition, the performance characteristics of GFB are majorly dependent on its design parameter. Thus, this paper briefly analyzes and optimizes the design parameters of bump-type GFB to improve its performance characteristic. The numerical simulation of bump-type GFB is performed in ANSYS software. The effect of various design parameters such as foil thickness, bump half-length, bump pitch, and bump angle on the output responses are analyzed using a response surface methodology based CCD design matrix. Here, the output responses are structural stiffness and the equivalent stress in foil bearing. To optimize it, the multi-objective GRA technique is used. These results show that the foil thickness is the most influencing and the bump angle is the least influencing design parameter. The optimal value of foil thickness, bump angle, bump half-length and bump pitch are 0.14mm, 63.75 deg., 1.55mm and 4.6mm respectively. At these optimal design parameters, the deviation between the predicted regression model and the numerical results are within 3.5%. Moreover, with these optimal design parameters, the structural stiffness of foil bearings increases by 68.4% and stress distribution reduces by 44.22% compared to the general configuration of foil bearings.

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A Finite Element Model for Static Performance Analysis of Gas Foil Bearings Based on Frictional Contacts

Cited by 13 publications

References 33 publications

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

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

Numerical Investigation of Gas Dynamic Foil Bearings Conjugated with Contact Friction by Elastic Multi-Leaf Foils

Modelling, analysis and optimization of design parameter of bump-type gas foil journal bearing

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