Fixed-point rubbing fault characteristic analysis of a rotor system based on contact theory

Abstract In this paper, fault characteristics of a single span rotor system with two discs are investigated when the rubbing between a disc and an elastic rod (a fixed limiter) occurs. First, a finite element (FE) model of the rotor system is developed, a point–point contact model is established to simulate the rotor–stator rubbing by simplifying the disc and the rod as two contact points, and then the two models are coupled by contact force. In addition, the augmented Lagrangian method is applied to deal with contact constraint conditions and the coulomb friction model is used to simulate rotor–stator frictional characteristics. The vibration features of the rotor system with rubbing are analyzed with respect to the effects of the gaps between the disc and the rod, the contact stiffnesses under three typical cases with different rotating speeds. The simulation results show that different rotor motions appear, such as period-one motion (P1), P2 and P3 with the increasing rotating speeds, which are in agreement with the experimental measurements. Besides, the gap between the disc and the rod as well as the contact stiffness has a main influence on the vibration intensity and collision rebound forms.

[1]  H. D. Nelson,et al.  The Dynamics of Rotor-Bearing Systems Using Finite Elements , 1976 .

[2]  Hans Ingo Weber,et al.  Experimental Observation of Chaotic Motion in a Rotor with Rubbing , 1998 .

[3]  M. Geradin,et al.  Finite element simulation of non‐linear transient response due to rotor‐stator contact , 1997 .

[4]  F. Chu,et al.  BIFURCATION AND CHAOS IN A RUB-IMPACT JEFFCOTT ROTOR SYSTEM , 1998 .

[5]  Jian-Bin Zhou,et al.  Nonlinear dynamics of a rub-impact micro-rotor system with scale-dependent friction model , 2008 .

[6]  Dara W. Childs.  Fractional-frequency rotor motion due to nonsymmetric clearance effects , 1982 .

[7]  A. Muszynska,et al.  Rotor-To-Stationary Element Rub-Related Vibration Phenomena in Rotating Machinery -- Literature Suryey , 1989 .

[8]  Paolo Pennacchi,et al.  Light and short arc rubs in rotating machines: Experimental tests and modelling , 2009 .

[9]  Bangchun Wen,et al.  Time-frequency features of two types of coupled rub-impact faults in rotor systems , 2009 .

[10]  Xuening Zhang,et al.  DYNAMIC BEHAVIOR OF THE FULL ROTORSTOP RUBBING: NUMERICAL SIMULATION AND EXPERIMENTAL VERIFICATION , 2002 .

[11]  Christophe Pierre,et al.  Modeling of a rotor speed transient response with radial rubbing , 2010 .

[12]  Horst Ecker,et al.  Nonlinear dynamics of a rotor contacting an elastically suspended stator , 2007 .

[13]  Sun Yi,et al.  On the non-linear dynamic behavior of a rotor–bearing system , 2004 .

[14]  F. Chu,et al.  Experimental observation of nonlinear vibrations in a rub-impact rotor system , 2005 .

[15]  Agnes Muszynska,et al.  Chaotic responses of unbalanced rotor/bearing/stator systems with looseness or rubs , 1995 .

[16]  F. F. Ehrich,et al.  High Order Subharmonic Response of High Speed Rotors in Bearing Clearance , 1988 .

[17]  Bangchun Wen,et al.  Periodic motions of a dual-disc rotor system with rub-impact at fixed limiter , 2008 .

[18]  J. C. Simo,et al.  An augmented lagrangian treatment of contact problems involving friction , 1992 .

[19]  T. Laursen.  Computational Contact and Impact Mechanics: Fundamentals of Modeling Interfacial Phenomena in Nonlinear Finite Element Analysis , 2002 .