Effects of surface roughness and porous structure on the hydrodynamic lubrication of multi-layer oil bearing
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
:Emerald Publishing Limited
Copyright © 2017, Emerald Publishing Limited