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Effects of surface roughness and porous structure on the hydrodynamic lubrication of multi-layer oil bearing

Guotao Zhang (Institute of Tribology, Hefei University of Technology, Hefei, China)
Yanguo Yin (Institute of Tribology, Hefei University of Technology, Hefei, China)
Lu Xue (Institute of Tribology, Hefei University of Technology, Hefei, China)
Guoqian Zhu (Institute of Tribology, Hefei University of Technology, Hefei, China)
Ming Tian (Institute of Tribology, Hefei University of Technology, Hefei, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 10 July 2017

Abstract

Purpose

The purpose of this paper is to discuss the combined effects of the deterministic surface roughness and porous structure on the lubrication property of the multi-layer bearing.

Design/methodology/approach

Digital filtering technique and Kozeny-Carman equation are used to simulate the random Gauss surface and the internal pore structure of the porous bearing, respectively. Effects of surface morphology, structure and pores on the lubrication property are discussed by using the finite difference method.

Findings

Results show that the lubrication performance of the multi-layer bearing increased with the increase of the surface roughness. Also, the transverse surface is better than that of the longitudinal surface. Moreover, lubricating property is getting worse with the increase of the height of each layer and the porosity. The lower permeability surface is beneficial to improve the lubrication performance when the total porosity is certain.

Originality/value

The effect of the Gauss roughness parameters on the detail of lubrication performance are analysed, such as the migration of the oil film rupture point position, the expansion of the pressure distribution region and the fluctuation of the pressure distribution curve with the roughness parameters. The combined effects of surface roughness, multi-layer structure and the internal pore parameters on the hydrodynamic behaviours of multi-layer porous bearing are analysed. This work is beneficial for the analysis of the tribological property and the structural design of multi-layer bearing.

Keywords

Acknowledgements

The authors are very grateful for the support of the Natural Science Foundation of China (No. 51575151, No. 50975072), the Anhui Key Scientific and Technological Projects (No. 1501021006).

Citation

Zhang, G., Yin, Y., Xue, L., Zhu, G. and Tian, M. (2017), "Effects of surface roughness and porous structure on the hydrodynamic lubrication of multi-layer oil bearing", Industrial Lubrication and Tribology, Vol. 69 No. 4, pp. 455-463. https://doi.org/10.1108/ILT-04-2016-0083

Publisher

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Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited