Experimental dynamic analysis of rod-fastening rotor bearing system with a transverse crack
Industrial Lubrication and Tribology
ISSN: 0036-8792
Article publication date: 28 December 2020
Issue publication date: 14 May 2021
Abstract
Purpose
This study aims to obtain the dynamic behaviours of cracked rod-fastening rotor bearing system (RFBS), and experimental investigation was carried out to examine the dynamic characteristics of this kind of assembled rotor bearing system with a transverse crack passing through the critical speed.
Design/methodology/approach
An experimental test rig of cracked RFBS was established for examining the vibration behaviours between intact and cracked system. The crack on the surface of a fastening rod was simulated by wire-electrode cutting processing method. The comprehensive analysis method of vibration was used to obtain the dynamic characteristics such as vibration amplitude, acceleration and whirling orbits before and after the critical speed as well as the instantaneous response in the process of speed up.
Findings
Some experimental vibration datum is obtained for cracked RFBS. The appearance of a crack will introduce the initial bending and make the vibration amplitude, acceleration and instant response in the process of speed up increase greatly as well as the change of whirling orbits.
Originality/value
The actual vibration characteristics for this complex assembled rotor system with a transverse crack are given passing through the critical speed. It can provide some useful help for monitoring the vibration behaviours of this kind of assembled rotor system as well as the detection of the crack fault.
Peer review
The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0260/
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., Wang, Q., Qi, S. and Liu, Y. (2021), "Experimental dynamic analysis of rod-fastening rotor bearing system with a transverse crack", Industrial Lubrication and Tribology, Vol. 73 No. 3, pp. 422-429. https://doi.org/10.1108/ILT-07-2020-0260
Publisher
:Emerald Publishing Limited
Copyright © 2020, Emerald Publishing Limited