Dynamic Model and Fault Feature Research of Dual-Rotor System with Bearing Pedestal Looseness
Joint Authors
Jiang, D. X.
Wang, N. F.
Xu, Hongzhi
Source
Mathematical Problems in Engineering
Issue
Vol. 2016, Issue 2016 (31 Dec. 2016), pp.1-18, 18 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2016-06-01
Country of Publication
Egypt
No. of Pages
18
Main Subjects
Abstract EN
The paper presents a finite element model of dual-rotor system with pedestal looseness stemming from loosened bolts.
Dynamic model including bearing pedestal looseness is established based on the dual-rotor test rig.
Three-degree-of-freedom (DOF) planar rigid motion of loose bearing pedestal is fully considered and collision recovery coefficient is also introduced in the model.
Based on the Timoshenko beam elements, using the finite element method, rigid body kinematics, and the Newmark- β algorithm for numerical simulation, dynamic characteristics of the inner and outer rotors and the bearing pedestal plane rigid body motion under bearing pedestal looseness condition are studied.
Meanwhile, the looseness experiments under two different speed combinations are carried out, and the experimental results are basically the same.
The simulation results are compared with the experimental results, indicating that vibration displacement waveforms of loosened rotor have “clipping” phenomenon.
When the bearing pedestal looseness fault occurs, the inner and outer rotors vibration spectrum not only contains the difference and sum frequency of the two rotors’ fundamental frequency but also contains 2 X and 3 X component of rotor with loosened support, and so forth; low frequency spectrum is more, containing dividing component, and so forth; the rotor displacement spectrums also contain fewer combination frequency components, and so forth; when one side of the inner rotor bearing pedestal is loosened, the inner rotor axis trajectory is drawn into similar-ellipse shape.
American Psychological Association (APA)
Wang, N. F.& Xu, Hongzhi& Jiang, D. X.. 2016. Dynamic Model and Fault Feature Research of Dual-Rotor System with Bearing Pedestal Looseness. Mathematical Problems in Engineering،Vol. 2016, no. 2016, pp.1-18.
https://search.emarefa.net/detail/BIM-1112089
Modern Language Association (MLA)
Wang, N. F.…[et al.]. Dynamic Model and Fault Feature Research of Dual-Rotor System with Bearing Pedestal Looseness. Mathematical Problems in Engineering No. 2016 (2016), pp.1-18.
https://search.emarefa.net/detail/BIM-1112089
American Medical Association (AMA)
Wang, N. F.& Xu, Hongzhi& Jiang, D. X.. Dynamic Model and Fault Feature Research of Dual-Rotor System with Bearing Pedestal Looseness. Mathematical Problems in Engineering. 2016. Vol. 2016, no. 2016, pp.1-18.
https://search.emarefa.net/detail/BIM-1112089
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1112089