Vibration response analysis of rubbing faults on a dual-rotor bearing system

In order to study the dual-rotor system’s rubbing fault, a new dynamic model is established. The unbalance and the rubbing faults are modeled, respectively. Considering the softening characteristics of casing, the Lankarani–Nikravesh model is utilized to describe the impact force between the disk an...

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Bibliographic Details
Published in:Archive of applied mechanics (1991) 2017-11, Vol.87 (11), p.1891-1907
Main Authors: Wang, Nanfei, Jiang, Dongxiang, Behdinan, Kamran
Format: Article
Language:English
Subjects:
Cascades
Classical Mechanics
Computer simulation
Dynamic characteristics
Engineering
Faults
Impact loads
Mathematical models
Original
Rotational spectra
Rotor-bearing systems
Rubbing
Stiffness
Theoretical and Applied Mechanics
Time domain analysis
Unbalance
Vibration analysis
Vibration response
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Summary:In order to study the dual-rotor system’s rubbing fault, a new dynamic model is established. The unbalance and the rubbing faults are modeled, respectively. Considering the softening characteristics of casing, the Lankarani–Nikravesh model is utilized to describe the impact force between the disk and fixed limiter. The numerical integral method is applied to obtain system’s dynamic behavior, and the characteristics of the rubbing faults are analyzed by time-domain waveform, 3D waterfall plot and spectrum cascades. The influences of rotational speed ratio, initial clearance, mass eccentricity and inter-shaft bearing stiffness on the dynamic characteristics are investigated. The vibration displacement of the low-pressure rotor is collected from the impact experiment performed on a dual-rotor test rig. The analysis result of simulation is identical with the experiment result. Consequently, this method can be used to study characteristics of rubbing faults of dual-rotor bearing system efficiently.
ISSN:0939-1533
1432-0681
DOI:10.1007/s00419-017-1299-9