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Normal fractal contact stiffness model among three disks of rod-fastening rotor system with considering friction and the asperities interaction

Nanshan Wang (School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, China)
Heng Liu (School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, China)
Yi Liu (School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 19 May 2021

Issue publication date: 2 June 2021

117

Abstract

Purpose

The purpose of this study is to develop a normal contact stiffness (NCS) model among three disks of the assembled rotor system, which systematically considers the friction coefficient, the asperities interaction and the elastoplastic contact regime.

Design/methodology/approach

Based on the revised fractal theory, considering the friction effect, the elastoplastic contact regime and the asperities interaction in a simple way, the total NCS among three disks of the rod-fastening rotor bearing system is established. Effects of fractal dimension and roughness, friction coefficient, asperities interaction and material properties on the normal stiffness are investigated by simulations and the relevant comparisons are given for examining the reasonability of the proposed model.

Findings

NCS will decrease when asperities interaction and friction are included. As the load increases, the influences of asperities interaction and friction on stiffness become serious. NCS will be enhanced when the elastoplastic regime is considered.

Originality/value

A comprehensive NCS model is developed. It provides a theoretical basis for the modeling of the NCS for multi-interfaces.

Keywords

Acknowledgements

This work was supported by the National Natural Science Foundation of China (grant no. 51475357 and 51705399).

Citation

Wang, N., Liu, H. and Liu, Y. (2021), "Normal fractal contact stiffness model among three disks of rod-fastening rotor system with considering friction and the asperities interaction", Industrial Lubrication and Tribology, Vol. 73 No. 4, pp. 652-659. https://doi.org/10.1108/ILT-12-2020-0484

Publisher

:

Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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