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

Friction 2021年第6期9卷 1450-1463页

作者： Yongpeng GU Xudong LAN Gexue REN Ming ZHOU School of Aerospace Engineering Tsinghua UniversityBeijing 100084China

This paper presents an efficient three-dimensional(3D)structural model for bump-type gas foil bearings(GFBs)developed by considering *** foil structures are modeled with a 3D shell finite element *** 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 *** proposed structural model was validated with published analytical and experimental *** 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 *** 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 *** 3D foil structure model should be used to study GFB misalignment.

关键词： gas foil bearing bump foil model frictional contact elastohydrodynamics bearing misalignment

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Numerical micro-texture optimization for lubricated contacts-A critical discussion

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Friction 2022年第11期10卷 1772-1809页

作者： Max MARIAN Andreas ALMQVIST Andreas ROSENKRANZ Michel FILLON Department of Mechanical and Metallurgical Engineering Pontificia Universidad Católica de ChileSantiago 690411Chile Division of Machine Elements LuleåUniversity of TechnologyLuleåSE-97187Sweden Department of Chemical Engineering Biotechnology and MaterialsFCFMUniversity of ChileSantiago 8370456Chile Institut Pprime CNRSUniversity of PoitiersPoitiers Cedex TSA 4112386073France

Despite numerous experimental and theoretical studies reported in the literature,surface micro-texturing to control friction and wear in lubricated tribo-contacts is still in the trial-and-error *** tribological behaviour and advantageous micro-texture geometries and arrangements largely depend on the contact type and the operating *** scale implementation is hampered by the complexity of numerical *** substantiates the urgent need to numerically design and optimize micro-textures for specific *** these aspects have not been covered by other review articles yet,we aim at summarizing the existing state-of–the art regarding optimization strategies for micro-textures applied in hydrodynamically and elastohydrodynamically lubricated *** analysis demonstrates the great potential of optimization strategies to further tailor micro-textures with the overall aim to reduce friction and wear,thus contributing toward an improved energy efficiency and sustainability.

关键词： micro-texturing hydrodynamics elastohydrodynamics tribo-simulation optimization

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NUMERICAL SOLUTION OF THE THREE-DIMENSIONAL ELASTOHYDRODYNAMIC LUBRICATION FOR HEAVILY-LOADED FINITE JOURNAL BEARINGS

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Journal of Hydrodynamics 1992年第4期4卷 78-87页

作者： Sun, Mu Lin, Xiaohui Navigatoin Engineering Coll of Nanjing Nanjing China

Elastohydrodynamic lubrication theory is combination of classical hydrodynamic lubrication and elastic theory. A coupling of finite element and boundary element method was applied to the analysis of 3-D elastohydro-dynamic lubrication for heavily-loaded finite journal bearings. In order to overcome difficulties of convergence at high eccentricity ratios, an iterative scheme was provided in this paper. The scheme called weighted average method was successfully carried out in the iterative procedures of a set of nonlinear equations that was constituted by a 2-D Reynolds' equation, a viscosity-pressure equation as well as 3-D elasticity equations. The analysis yields performances parameters and minimum film thickness of the finite journal bearings under heavy loading.

关键词： Boundary element method elastohydrodynamics Finite element method Journal bearings Three dimensional

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The effect of texture on the shaft surface on the sealing performance of radial lip seals

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Science China(Physics,Mechanics & Astronomy) 2014年第7期57卷 1343-1351页

作者： GUO Fei JIA XiaoHong GAO Zhi WANG YuMing State Key Laboratory of Tribology Tsinghua University

On the basis of elastohydrodynamic model,the present study numerically analyzes the effect of various microdimple texture shapes,namely,circular,square,oriented isosceles triangular,on the pumping rate and the friction torque of radial lip seals,and determines the microdimple texture shape that can produce positive pumping *** area ratio,depth and shape dimension of a single texture are the most important geometric parameters which influence the tribological *** to the selected texture shape,parameter analysis is conducted to determine the optimal combination for the above three ***,the simulated performances of radial lip seal with texture on the shaft surface are compared with those of the conventional lip seal without any texture on the shaft surface.

关键词： rotary lip seal elastohydrodynamics surface texture pumping rate friction torque

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