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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2011, Vol. 12 Issue (1): 46-55    DOI: 10.1631/jzus.A1000130
Mechanics and Mechanical Engineering     
Nonlinear dynamic analysis of a rotor/bearing/seal system
Wei Li, Yi Yang, De-ren Sheng, Jian-hong Chen, Yong-qiang Che
Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  In this study a new dynamic model of a rotor system is established based on the Hamilton principle and the finite element method (FEM). We analyze the dynamic behavior of the rotor system with the coupled effects of the nonlinear oil film force, the nonlinear seal force, and the mass eccentricity of the disk. The equations of the motion are solved effectively using the fourth order Runge-Kutta method in MATLAB. The dynamic behavior of the system is illustrated by bifurcation diagrams, largest Lyapunov exponents, phase trajectory diagrams, and Poincaré maps. The numerical results show that the rotational speed of the rotor, the pressure drop in the seal, the seal length, the seal clearance, and the mass eccentricity of the disk are the key parameters that significantly affect the dynamic characteristics of the rotor system. The motion of the rotor system exhibits complex types of periodic, quasi-periodic, double-periodic, multi-periodic, and chaotic vibrations. This analysis can be used to guide the design of seal parameters and to diagnose the vibration of rotor/bearing/seal systems.

Key words： Nonlinear      Rotor system      Hamilton principle      Dynamic      Finite element method (FEM)     
Received: 31 March 2010      Published: 06 January 2011
CLC:  TH117.2  
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Wei Li
De-ren Sheng
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Jian-hong Chen
Yong-qiang Che
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Wei Li, Yi Yang, De-ren Sheng, Jian-hong Chen, Yong-qiang Che. Nonlinear dynamic analysis of a rotor/bearing/seal system. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2011, 12(1): 46-55.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1000130     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2011/V12/I1/46

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