A multiscale method for optimising surface topography in elastohydrodynamic lubrication (EHL) using metamodels

De Boer, G.N., Gao, L. ORCID: 0000-0002-3738-3573, Hewson, R.W., Thompson, H.M., Raske, N. and Toropov, V.V., 2016. A multiscale method for optimising surface topography in elastohydrodynamic lubrication (EHL) using metamodels. Structural and Multidisciplinary Optimization, 54 (3), pp. 483-497. ISSN 1615-147X

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Abstract

The frictional performance of a bearing is of significant interest in any mechanical system where there are lubricated surfaces under load and in relative motion. Surface topography plays a major role in determining the coefficient of friction for the bearing because the size of the fluid film and topography are of a comparable order. The problem of optimising topography for such a system is complicated by the separation in scales between the size of the lubricated domain and that of the topography, which is of at least one order of magnitude or more smaller. This paper introduces a multiscale method for optimising the small scale topography for improved frictional performance of the large scale bearing. The approach fully couples the elastohydrodynamic lubrication at both scales between pressure generated in the lubricant and deformation of the bounding surfaces. Homogenised small scale data is used to inform the large scale model and is represented using Moving Least Squares metamodels calibrated by cross validation. An optimal topography for a minimum coefficient of friction for the bearing is identified and comparisons made of local minima in the response, where very different topographies with similar frictional performance are observed. Comparisons of the optimal topography with the smooth surface model demonstrated the complexity of capturing the non-linear effect of topography and the necessity of the multiscale method in capturing this. Deviations from the smooth surface model were quantified by the metamodel coefficients and showed how topographies with a similar frictional performance have very different characteristics.

Item Type: Journal article
Publication Title: Structural and Multidisciplinary Optimization
Creators: De Boer, G.N., Gao, L., Hewson, R.W., Thompson, H.M., Raske, N. and Toropov, V.V.
Publisher: Springer
Date: September 2016
Volume: 54
Number: 3
ISSN: 1615-147X
Identifiers:
NumberType
10.1007/s00158-016-1412-7DOI
1412Publisher Item Identifier
Rights: © The Author(s) 2016. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Divisions: Schools > School of Science and Technology
Depositing User: Linda Sullivan
Date Added: 17 Jun 2019 14:48
Last Modified: 17 Jun 2019 14:48
URI: http://irep.ntu.ac.uk/id/eprint/36832

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