On the oil-whipping of a rotor-bearing system by a continuum model

• Published in: Applied mathematical modelling Vol. 29; no. 5; pp. 461 - 475
• Main Authors: Jing, JianPing, Meng, Guang, Sun, Yi, Xia, SongBo
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 01.05.2005; Elsevier Science
• Subjects: Applied sciences; Bearings, bushings, rolling bearings; Drives; Exact sciences and technology; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Mechanical engineering. Machine design; Physics; Solid mechanics; Structural and continuum mechanics; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...); Vibration; Refinement method; Rupture; Unbalanced conditions; Automatic mesh generation; Modeling; Adaptive method; Direct method; Finite element method; Shaft; Non linear effect; Dynamic model; Journal bearing
• ISSN: 0307-904X
• DOI: 10.1016/j.apm.2004.09.003

The nonlinear dynamic behavior of a rotor-bearing system is analyzed based on a continuum model. The finite element method is adopted in the analysis. Emphasis is placed on the so-called “oil-whip phenomena” which might lead to the failure of the rotor system. The dynamic response of the system in unbalanced conditions is approached by a direct integration method. It is found that a typical “oil-whip phenomenon” is successfully simulated, and the effect of the refinement of the finite element mesh is also checked. Furthermore, the bifurcation behavior of the oil-whip phenomenon that is of much concern in recent nonlinear dynamics research is analyzed. The rotor-bearing system is also examined by a simple discrete model. Significant differences are found between these two models. It is suggested that a careful examination should be made in modeling the nonlinear dynamic behavior of a rotor system.