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On the Two-Scale Modelling of Elastohydrodynamic Lubrication in Tilted-Pad Bearings
School of Mechanical Engineering, University of Leeds, Leeds, UK.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.ORCID-id: 0000-0001-7029-1112
2018 (svensk)Inngår i: Lubricants, ISSN 2075-4442, Vol. 6, nr 3, artikkel-id 78Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A two-scale method for modelling the Elastohydrodynamic Lubrication (EHL) of tilted-pad bearings is derived and a range of solutions are presented. The method is developed from previous publications and is based on the Heterogeneous Multiscale Methods (HMM). It facilitates, by means of homogenization, incorporating the effects of surface topography in the analysis of tilted-pad bearings. New to this article is the investigation of three-dimensional bearings, including the effects of both ideal and real surface topographies, micro-cavitation, and the metamodeling procedure used in coupling the problem scales. Solutions for smooth bearing surfaces, and under pure hydrodynamic operating conditions, obtained with the present two-scale EHL model, demonstrate equivalence to those obtained from well-established homogenization methods. Solutions obtained for elastohydrodynamic operating conditions, show a dependency of the solution to the pad thickness and load capacity of the bearing. More precisely, the response for the real surface topography was found to be stiffer in comparison to the ideal. Micro-scale results demonstrate periodicity of the flow and surface topography and this is consistent with the requirements of the HMM. The means of selecting micro-scale simulations based on intermediate macro-scale solutions, in the metamodeling approach, was developed for larger dimensionality and subsequent calibration. An analysis of the present metamodeling approach indicates improved performance in comparison to previous studies.

sted, utgiver, år, opplag, sider
MDPI, 2018. Vol. 6, nr 3, artikkel-id 78
Emneord [en]
tilted-pad bearings, elastohydrodynamic lubrication, surface topography, homogenization, heterogenous multiscale methods
HSV kategori
Forskningsprogram
Maskinelement
Identifikatorer
URN: urn:nbn:se:ltu:diva-71293DOI: 10.3390/lubricants6030078Scopus ID: 2-s2.0-85056411989OAI: oai:DiVA.org:ltu-71293DiVA, id: diva2:1257638
Merknad

Validerad;2018;Nivå 2;2018-10-22 (svasva)

Tilgjengelig fra: 2018-10-22 Laget: 2018-10-22 Sist oppdatert: 2018-11-23bibliografisk kontrollert

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