Research on Periodic Motion Stability of Multi-DOF Rotor-Bearing System with Crack Fault

Abstract:

Multi-DOF model of double-disc rotor-bearing system taking crack and oil film support into account is established, and the continuation shooting method combined with Newmark is also applied to stability analysis of continuous system. This paper mainly studied the variation law of five parameters domain in crack depth and location, then a number of conclusions are found: first, it’s feasible to study the stability of nonlinear rotor-bearing system with crack faults using FEM; secondly, the crack depth and location has a certain impact on instability speed, but the impact is not great and owns its certain law. As the crack depth and location is getting close to the middle position of rotor, due to its impact on the oil film support, the instability speed of system increases. This method and results in this paper provides a theoretical reference for stability analysis and vibration control in more complex relevant rotor-bearing system with crack fault.

• Periodical: Applied Mechanics and Materials (Volumes 148-149)
• Pages: 3-6
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.148-149.3
• Online since: December 2011
• Authors: Chao Feng Li, Qin Liang Li, Jie Liu, Bang Chun Wen
• Keywords: Bifurcation, Crack Fault, Finite Element Model (FEM), Rotor-Bearing System, Stability

References

[1] C.W. Lee. Modeling of a simple rotor with a switching crack and its experimental verification. ASME Journal of Vibration and Acoustics, Vol. 114 (1992), p.217.

DOI: 10.1115/1.2930251

[2] G. Meng. The nonlinear influences of whirl speed on the stability and response of a cracked rotor. Journal of Machine Vibration, Vol. 4 (1992), p.216.

[3] J. B. Zheng, G. Meng. The stability analysis of cracked rotor with support in the neck bearing using Chebyshev polynomial method. Journal of Northwestern Polytechnical University, Vol. 15 (1997), p.383.

[4] Y. G. Luo, S.H. Zhang, X.D. Liu, et al. Twin spans cracked rotor-the periodic motion stability of bearing system. Journal of Agriculture Machinery, Vol. 38 (2007), p.168.

[5] T.S. Zheng, N. Hasebe. An efficient analysis of high-order dynamical system with local nonlinearity. Vol. 121 (1999), p.408.

DOI: 10.1115/1.2893995

[6] T.S. Zheng, T. Hasebe. Nonlinear dynamic behaviors of a complex rotor-bearing system. Journal of Applied Mechanics, Vol. 67 (2000), p.485.

DOI: 10.1115/1.1286208

[7] J.P. Jing, G. Meng, Y. Sun, et al. On the nonlinear dynamic behavior of a rotor-bearing system. Journal of Sound and Vibration, Vol. 274 (2004), p.1031.

[8] J.P. Jing, G. Meng, Y. Sun, et al. On the oil-whipping of a rotor-bearing system by a continuum model. Applied Mathematical Modeling, Vol. 29 (2005), p.461.

DOI: 10.1016/j.apm.2004.09.003

[9] G. Adiletta, A. R. Guido, C. Rossi. Chaotic motions of a rigid rotor in short journal bearings. Nonlinear Dynamics, Vol. 10 (1996), p.251.

DOI: 10.1007/bf00045106

[10] C.F. Li, H. Li, H. Ma, et al. Multiple degrees of freedom rub-impact faults rotor-research of periodic motion stability of bearing system. Journal of Mechanical Engineering, Vol. 46 (2010), p.107.