A fully coupled 3D thermo-elastohydrodynamics model for a bump-type compliant foil journal bearing

Aksoy, Serdar; Akşit, Mahmut Faruk

doi:10.1016/j.triboint.2014.10.001

Cited by 38 publications

(10 citation statements)

References 21 publications

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“…Commercial software was used to carry out a fully coupled 3D analysis. In 2015, Aksoy and Aksit [32] improved the discussed model and presented a fully coupled 3D thermoelastohydrodynamic model (TEHD) of a first-generation bump-type foil bearing. The top section of the bumps was modelled using simple geometry to reduce the contact pressure and stress concentration.…”

Section: A Survey Of Research On Dynamic Properties Of the Foil Bearimentioning

confidence: 99%

Experimental and numerical evaluation of the damping properties of a foil bearing structure taking into account the static and kinetic dry friction

Żywica

Bagiński

Bogulicz

2020

J Braz. Soc. Mech. Sci. Eng.

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Over the past decades, experimental and theoretical studies on gas foil bearings have been conducted extensively. The essence of the operation of these bearings lies in the use of a unique underlying support mechanism, whose properties adapt to current operating conditions. The static and dynamic characteristics of the foil bearing structure depend not only on the geometry of the supporting structure but also on foil material, surface topology, the velocity of contact surfaces, load, etc. While the concept of stiffness is more intuitive and well described in the literature, the evaluation of the damping in foil bearings is not as obvious. The goal of this paper is to improve the understanding of the damping mechanism of the bump-type foil bearing structure under dynamic loads. At the beginning of the paper, the experimental studies of the foil bearing structure in a wide frequency range are discussed. Then, the experimental conditions were reproduced using an advanced numerical model that took into account the geometry of the top and bump foil, contact phenomena and dry friction. A new solution, unprecedented in the existing literature, is the inclusion of static and kinetic friction in the numerical model of the foil bearing structure. The developed numerical model made it possible to determine the system characteristics, including the evaluation of stiffness and damping. An important contribution of this work is the comparison of the results of calculations obtained with the use of an advanced numerical model with the results of experimental research. The paper gives clear guidelines for the experimental and numerical determination of dynamic characteristics for the bump-type foil bearing structure. The presented results of the experimental research can also be used to verify other numerical models.

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Section: A Survey Of Research On Dynamic Properties Of the Foil Bearimentioning

confidence: 99%

Experimental and numerical evaluation of the damping properties of a foil bearing structure taking into account the static and kinetic dry friction

Żywica

Bagiński

Bogulicz

2020

J Braz. Soc. Mech. Sci. Eng.

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“…Simplified models of such a bearing can be used only at the initial stage of the design engineering process. In many scientific centres, methods for modelling and analysing foil bearings are constantly developed (Aksoy et al, 2015), which are then verified using the results of experimental research (Żywica, 2013;Feng et al, 2015).…”

Section: Self-adaptive Properties Of Foil Bearingsmentioning

confidence: 99%

Investigation of Gas Foil Bearings With an Adaptive and Non-Linear Structure

Żywica

Bagiński

2019

Acta Mechanica Et Automatica

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The article discusses the results of simulation-based and experimental research carried out on gas foil bearings. Owing to the use of a set of flexible thin foils in such bearings, they exhibit certain beneficial features that cannot be found in other types of bearings. They have nonlinear operational characteristics and allow the dissipation of excess energy, thus reducing the vibration level. Moreover, gas foil bearings can self-adapt themselves to the current operating conditions by changing the shape of the lubrication gap. Therefore, they can be used to improve the dynamic performance of rotors, in particular, those operating at very high rotational speeds. This article explains the mechanisms for changes of stiffness and vibration damping in compliant components of a foil bearing. The results of the analysis of the bearing’s subassemblies using advanced numerical models are presented. They are followed by conclusions that were drawn not only from these results but also from the results of the experimental research. It has been proven that the rotor supported on carefully designed foil bearings is capable of maintaining a low vibration level, even if it operates at a high rotational speed.

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“…It was demonstrated that curved bump strips should be used in foil thrust bearings; i.e., the 3D detailed shape of a bump foil should be considered. Most other 3D foil structure models were built using commercial FE programs to model complex contact and friction behaviors [29][30][31]. The 3D FE model can be further used to study detailed wear behaviors [32].…”

Section: Introductionmentioning

confidence: 99%

An efficient three-dimensional foil structure model for bump-type gas foil bearings considering friction

Lan

Ren

et al. 2020

Friction

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This paper presents an efficient three-dimensional (3D) structural model for bump-type gas foil bearings (GFBs) developed by considering friction. The foil structures are modeled with a 3D shell finite element model. Using the bump foil mechanical characteristics, the Guyan reduction and component mode synthesis methods are adopted to improve computational efficiency while guaranteeing accurate static responses. A contact model that includes friction and separation behaviors is presented to model the interactions of the bump foil with the top foil and bearing sleeve. The proposed structural model was validated with published analytical and experimental results. The coupled elastohydrodynamics model of GFBs was established by integration of the proposed structural model with data on hydrodynamic films, and it was validated by comparisons with existing experimental results. The performance of a bearing with an angular misalignment was studied numerically, revealing that the reaction torques of the misaligned bearing predicted by GFB models with 2D and 3D foil structure models are quite different. The 3D foil structure model should be used to study GFB misalignment.

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A fully coupled 3D thermo-elastohydrodynamics model for a bump-type compliant foil journal bearing

Cited by 38 publications

References 21 publications

Experimental and numerical evaluation of the damping properties of a foil bearing structure taking into account the static and kinetic dry friction

Experimental and numerical evaluation of the damping properties of a foil bearing structure taking into account the static and kinetic dry friction

Investigation of Gas Foil Bearings With an Adaptive and Non-Linear Structure

An efficient three-dimensional foil structure model for bump-type gas foil bearings considering friction

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