Dynamic Characteristics and Experimental Research of a Two-Span Rotor-Bearing System with Rub-Impact Fault

Rotor rub-impact has a great influence on the stability and safety of a rotating machine. This study develops a dynamic model of a two-span rotor-bearing system with rubbing faults, and numerical simulation is carried out. Moreover, frictional screws are used to simulate a rubbing state by establish...

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Bibliographic Details
Published in:Shock and vibration 2019, Vol.2019 (2019), p.1-15
Main Authors: Ren, Jian-xing, Zhao, An-lei, Han, Qing-peng, Wang, Guang-chao, Zhu, Rui, Xia, Xin
Format: Article
Language:English
Subjects:
Analysis
Computer simulation
Dynamic characteristics
Dynamic models
Dynamic stability
Fault diagnosis
Frequency spectrum
Friction
Mathematical models
Military helicopters
Numerical analysis
Poincare maps
Rotating machinery
Rotating machines
Rotor-bearing systems
Rubbing
Signal processing
Stators
Vibration
Vibration analysis
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Summary:Rotor rub-impact has a great influence on the stability and safety of a rotating machine. This study develops a dynamic model of a two-span rotor-bearing system with rubbing faults, and numerical simulation is carried out. Moreover, frictional screws are used to simulate a rubbing state by establishing a set of experimental devices that can simulate rotor-stator friction in the rotor system. Through the experimental platform and its analysis system, the rubbing experiment was conducted, and the vibration of the rotor-bearing system before and after the critical speed is observed. Rotors running under normal condition, local slight rubbing, and severe rubbing throughout the entire cycle are simulated. Dynamic trajectories, frequency spectrum diagrams, chart of axis track, and Poincare maps are used to analyze the features of the rotor-bearing system with rub-impact faults under various parameters. The vibration characteristics of rub impact are obtained. Results show that the dynamic characteristics of the rotor-bearing system are affected by the change in velocity and degree of impact friction. The findings are helpful in further understanding the dynamic characteristics of the rub-impact fault of the two-span rotor-bearing system and provide reference for fault diagnosis.
ISSN:1070-9622
1875-9203
DOI:10.1155/2019/6309809