Journal ArticleDOI
Nonlinear analysis of a rub-impact rotor-bearing system with initial permanent rotor bow
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In this article, a general model of a Rub-impact rotor-bearing system with initial permanent bow is set up and the corresponding governing motion equation is given, and the nonlinear oil-film forces from the journal bearing are obtained under the short bearing theory.Abstract:
A general model of a rub-impact rotor-bearing system with initial permanent bow is set up and the corresponding governing motion equation is given. The nonlinear oil-film forces from the journal bearing are obtained under the short bearing theory. The rubbing model is assumed to consist of the radial elastic impact and the tangential Coulomb type of friction. Through numerical calculation, rotating speeds, initial permanent bow lengths and phase angles between the mass eccentricity direction and the rotor permanent bow direction are used as control parameters to investigate their effect on the rub-impact rotor-bearing system with the help of bifurcation diagrams, Lyapunov exponents, Poincare maps, frequency spectrums and orbit maps. Complicated motions, such as periodic, quasi-periodic even chaotic vibrations, are observed. Under the influence of the initial permanent bow, different routes to chaos are found and the speed when the rub happens is changed greatly. Corresponding results can be used to diagnose the rub-impact fault in this kind of rotor systems and this study may contribute to a further understanding of the nonlinear dynamics of such a rub-impact rotor-bearing system with initial permanent bow.read more
Citations
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Journal ArticleDOI
Chaotic vibration analysis of rotating, flexible, continuous shaft-disk system with a rub-impact between the disk and the stator
TL;DR: In this paper, the chaotic vibration analysis of a rotating flexible continuous shaft-disk system with rub-impact is studied, where the system is modeled as a continuous shaft with a rigid disk in its midsection with Coriolis and centrifugal effects included.
Journal ArticleDOI
Nonlinear vibration phenomenon of an aircraft rub-impact rotor system due to hovering flight
Lei Hou,Yushu Chen,Qingjie Cao +2 more
TL;DR: The results obtained in this paper will contribute an understanding of the nonlinear dynamic behaviors of aircraft rotor systems in maneuvering flight.
Journal ArticleDOI
Nonlinear dynamical behaviors of a complicated dual-rotor aero-engine with rub-impact
Chuanzong Sun,Yushu Chen,Lei Hou +2 more
TL;DR: A novel framework is proposed, in which the sophisticated geometrical structure is considered by finite solid element method and efficient model order reduction is applied to the model, which provides a better understanding of the nonlinear dynamical behaviors of the real complicated dual-rotor aero-engine with rub-impact.
Journal ArticleDOI
Nonlinear dynamic analysis of a rub-impact rotor supported by oil film bearings
TL;DR: In this article, a general model of a rub-impact rotor system is set up and supported by oil film journal bearings, and the Jacobian matrix of the system response is used to calculate the Floquet multipliers.
Journal ArticleDOI
Dynamic characteristics of a disk–drum–shaft rotor system with rub-impact
Lun Liu,Dengqing Cao,Shupeng Sun +2 more
TL;DR: In this paper, the dynamic model of a disk-drum-shaft rotor system with rub-impact was established and its dynamic characteristics were analyzed, taking into account the coupling of the whole rotor whirl and the local drum vibration.
References
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Journal ArticleDOI
Chaotic motions of a rigid rotor in short journal bearings
TL;DR: In this article, the conditions that give rise to chaotic motions in a rigid rotor on short journal bearings are investigated and determined, and a suitable symmetry was given to the rotor, to the supporting system, to acting system of forces and to the system of initial conditions, in order to restrict the motions of the rotor to translatory whirl.
Journal ArticleDOI
Rotor-to-stationary element sub-related vibration phenomena in rotating machinery: literature survey
TL;DR: Vibrations dues au frottement entre rotor and stator dans les machines tournantes. Analyse de la litterature parue sur le sujet as discussed by the authors.
Book
Handbook of Rotordynamics
TL;DR: In this article, a rotor rotor reference record was created on 2005-11-18, modified on 2016-08-08 and a dynamique reference record for dynamique was created.
Journal ArticleDOI
Interaction of a Whirling Rotor with a Vibrating Stator across a Clearance Annulus
TL;DR: In this article, the rotor and stator are regarded as linear multi-degree-of-freedom systems including damping, and dry friction at the clearance space is taken into account.
Journal ArticleDOI
Periodic, quasi-periodic and chaotic vibrations of a rub-impact rotor system supported on oil film bearings
Fulei Chu,Zhengsong Zhang +1 more
TL;DR: In this paper, a nonlinear mathematical model with piecewise linear stiffness is used to investigate the vibration characteristics of a rub-impact rotor system supported on oil film bearings. And the Coulomb type of frictional relationship is assumed in the analysis.
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