Effect of a transverse crack on the dynamic behaviours of a 3D rod-fastening rotor bearing system
Industrial Lubrication and Tribology
ISSN: 0036-8792
Article publication date: 21 October 2020
Issue publication date: 4 March 2021
Abstract
Purpose
This paper aims to examine the dynamic behaviours of a three-dimensional (3D) rod-fastening rotor bearing system (RFBS) with a crack in a fastening rod.
Design/methodology/approach
Based on the 3D finite element method model and stress analysis of a cracked RFBS, a 3D dynamic model of the RFBS with a crack in a fastening rod is established with considering the initial bending and stress redistribution caused by the crack. A combined numerical simulation technology is used to investigate the dynamic behaviours of the system.
Findings
The distribution of contact stress between the two disks will be not uniform, and the initial bending of the system will occur due to the presence of a crack. This will lead to the change of system stiffness and the dynamic behaviours such as vibration amplitude, and motion orbits will change significantly.
Research limitations/implications
A 3D finite element method dynamic model is proposed for the study of dynamic characteristics of complex combined rotor bearing system with cracks.
Practical implications
It is helpful and significant to master the dynamic behaviours of cracked RFBS. It is helpful to detect the presence of a crack of the rotor bearing system.
Social implications
Some of the losses caused by crack failure may be reduced.
Originality/value
The proposed 3D method can provide a useful reference for the study of dynamic characteristics of complex combined rotor bearing system with cracks.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-05-2020-0189
Keywords
Acknowledgements
This work was supported by the National Natural Science Foundation of China [Grant No. 51475357 and No. 51705399].
Citation
Wang, N., Liu, H., Liu, Y., Wang, Q., Qi, S. and Xu, Z. (2021), "Effect of a transverse crack on the dynamic behaviours of a 3D rod-fastening rotor bearing system", Industrial Lubrication and Tribology, Vol. 73 No. 2, pp. 221-229. https://doi.org/10.1108/ILT-05-2020-0189
Publisher
:Emerald Publishing Limited
Copyright © 2020, Emerald Publishing Limited