Bifurcation characteristic of a cracked rotor-bearing system under air-exciting forces of steam turbine

被引：0
|
作者：
Weng L. [1 ,2 ]
Yang Z.-C. [1 ,2 ]
Cao Y.-Y. [1 ,2 ]
机构：
[1] Institute of High Temperature Structural Composite Materials for Naval Ship, Naval University of Engineering, Wuhan
[2] College of Power Engineering, Naval University of Engineering, Wuhan
来源：
Yang, Zi-Chun | 2016年 / Chinese Vibration Engineering Society卷 / 35期
关键词：
Air-exciting forces of steam turbine; Bifurcation; Nonlinear vibration; Rotor-bearing system;
D O I：
10.13465/j.cnki.jvs.2016.05.014
中图分类号：
学科分类号：
摘要：
The dynamic model of a cracked rotor-bearing system under air-exciting forces of steam turbine was established. Numerical method was adopted to analyze bifurcation and chaos characteristics of the system. The effects of air-exciting forces of steam turbine and depths of crack on the vibration response of the rotor were discussed using Poincare's cross-section, portraits of central point and bifurcation diagrams. The results indicated that the dynamic periodic responses of the system occur in advance and its chaotic motion region decreases due to air-exciting forces of stream turbine; moreover, for the dynamic responses of the system, the air-exciting forces of stream turbine play a dominant role in case of shallow cracks, and period-eight motions appear in the super-critical speed region of the system; with increase in crack depth, the system's chaotic motion region decreases and almost disappears around the critical speed; the system's quasi-period motions become a longer period-three motion in the system's super-critical speed region. The study results provided a reference for further understanding the failure mechanism of such a rotor-bearing system. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：89 / 95
页数：6
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