Investigating the influences of pressure-equalizing grooves on characteristics of aerostatic bearings based on CFD

Ruzhong Yan (College of Mechanical Engineering, Donghua University, Shanghai, China, and Engineering Research Center of Advanced Textile Machinery, Ministry of Education, Shanghai, China)
Liaoyuan Wang (College of Mechanical Engineering, Donghua University, Shanghai, China, and Engineering Research Center of Advanced Textile Machinery, Ministry of Education, Shanghai, China)
Shengze Wang (College of Mechanical Engineering, Donghua University, Shanghai, China, and Engineering Research Center of Advanced Textile Machinery, Ministry of Education, Shanghai, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Publication date: 9 September 2019

Abstract

Purpose

The purpose of this study is to reveal the influence law of pressure-equalizing grooves on aerostatic bearings and improve the static performance of bearings by optimizing the distribution form of grooves.

Design/methodology/approach

In view of two kinds of common restrictor distribution forms on the thrust surface, the linear and the rectangular, six kinds of pressure-equalizing groove schemes were proposed – the line-shape, the extended-shape, the S-shape, the oblong-shape, the X-shape and the reticular-shape. Based on the analysis of lubrication theory of the orifice-type aerostatic bearing, the numerical simulations of different bearings were carried out. The pressure distributions and static characteristic curves of different bearings were obtained.

Findings

The study reveals that the adoption of the pressure-equalizing grooves can substantially improve the load capacity and static stiffness of the bearing and make the bearing maintain a uniform stress, which enhances operating accuracy and life of the bearing. The superior function of the reticular-shape groove is highlighted.

Originality/value

The research results can effectively guide the optimization design of aerostatic bearings and provide a crucial technical reference for application of ultra-precision aerostatic supporting system.

Keywords

Acknowledgements

The first author would like to thank his student Liaoyuan Wang and colleague Shengze Wang for their efforts in this paper.

Citation

Yan, R., Wang, L. and Wang, S. (2019), "Investigating the influences of pressure-equalizing grooves on characteristics of aerostatic bearings based on CFD", Industrial Lubrication and Tribology, Vol. 71 No. 7, pp. 853-860. https://doi.org/10.1108/ILT-11-2018-0411

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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