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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2014, Vol. 15 Issue (11): 883-895    DOI: 10.1631/jzus.A1400100
Mechanical Engineering     
Modeling a two-span rotor system based on the Hamilton principle and rotor dynamic behavior analysis
Wei Li, De-ren Sheng, Jian-hong Chen, Yong-qiang Che
Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China
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Abstract  A nonlinear dynamic model of a two-span rotor system is constructed based on the Hamilton principle and the finite element method. The Musznyska model and the short bearing model are employed to describe the nonlinear seal force and oil-film force. The fourth-order Runge-Kutta method is used to calculate the numerical solutions. The bifurcation diagrams, time-history diagrams, phase trajectories, and Poincare maps are presented to analyze the dynamic behavior of the bearing center and the disk center in the horizontal direction. The numerical results indicate that the rotational speed, the nonlinear seal force, the oil-film force, and the stiffness of the coupling have a significant effect on the stability of the rotor system. The dynamic behavior of the two-span rotor system is more complicated when impacted by the nonlinear seal force and oil-film force.

Key words： Hamilton principle      Two-span rotor system      Nonlinear seal force      Dynamic characteristic     
Received: 16 April 2014      Published: 04 November 2014
CLC:  TK14  
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Wei Li
De-ren Sheng
Jian-hong Chen
Yong-qiang Che
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Wei Li, De-ren Sheng, Jian-hong Chen, Yong-qiang Che. Modeling a two-span rotor system based on the Hamilton principle and rotor dynamic behavior analysis. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2014, 15(11): 883-895.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1400100     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2014/V15/I11/883

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