NDLI: Vibration characteristics of a hydraulic generator unit rotor system with parallel misalignment and rub-impact

Content Provider	Springer Nature Link
Author	Huang, Zhiwei Zhou, Jianzhong Yang, Mengqi Zhang, Yongchuan
Copyright Year	2010
Abstract	The object of this research aims at the hydraulic generator unit rotor system. According to fault problems of the generator rotor local rubbing caused by the parallel misalignment and mass eccentricity, a dynamic model for the rotor system coupled with misalignment and rub-impact is established. The dynamic behaviors of this system are investigated using numerical integral method, as the parallel misalignment, mass eccentricity and bearing stiffness vary. The nonlinear dynamic responses of the generator rotor and turbine rotor with coupling faults are analyzed by means of bifurcation diagrams, Poincaré maps, axis orbits, time histories and amplitude spectrum diagrams. Various nonlinear phenomena in the system, such as periodic, three-periodic and quasi-periodic motions, are studied with the change of the parallel misalignment. The results reveal that vibration characteristics of the rotor system with coupling faults are extremely complex and there are some low frequencies with large amplitude in the 0.3–0.4× components. As the increase in mass eccentricity, the interval of nonperiodic motions will be continuously moved forward. It suggests that the reduction in mass eccentricity or increase in bearing stiffness could preclude nonlinear vibration. These might provide some important theory references for safety operating and exact identification of the faults in rotating machinery.
Starting Page	829
Ending Page	838
Page Count	10
File Format	PDF
ISSN	09391533
Journal	Archive of Applied Mechanics
Volume Number	81
Issue Number	7
e-ISSN	14320681
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-06-26
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydraulic generator unit Rotor system Parallel misalignment Rub-impact Nonlinear dynamic Fault diagnosis Theoretical and Applied Mechanics Mechanics
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering

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