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

Normal fractal contact stiffness model among three disks of rod-fastening rotor system with... 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/approachBased 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.FindingsNCS 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/valueA comprehensive NCS model is developed. It provides a theoretical basis for the modeling of the NCS for multi-interfaces. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Industrial Lubrication and Tribology Emerald Publishing

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

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Publisher
Emerald Publishing
Copyright
© Emerald Publishing Limited
ISSN
0036-8792
DOI
10.1108/ilt-12-2020-0484
Publisher site
See Article on Publisher Site

Abstract

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/approachBased 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.FindingsNCS 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/valueA comprehensive NCS model is developed. It provides a theoretical basis for the modeling of the NCS for multi-interfaces.

Journal

Industrial Lubrication and TribologyEmerald Publishing

Published: Jun 2, 2021

Keywords: Fractal theory; Friction coefficient; Normal contact stiffness; Asperities interaction; Elastoplastic regime

References