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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 University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-7029-1112
2018 (Swedish)In: Lubricants, ISSN 2075-4442, Vol. 6, no 3, article id 78Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
MDPI, 2018. Vol. 6, no 3, article id 78
Keywords [en]
tilted-pad bearings, elastohydrodynamic lubrication, surface topography, homogenization, heterogenous multiscale methods
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-71293DOI: 10.3390/lubricants6030078Scopus ID: 2-s2.0-85056411989OAI: oai:DiVA.org:ltu-71293DiVA, id: diva2:1257638
Note

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

Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2018-11-23Bibliographically approved

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Almqvist, Andreas

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