汽轮机非线性间隙气流激振力作用下含裂纹转子的振动特性研究

瓮 雷1,2,杨自春1,2,曹跃云1,2

振动与冲击 ›› 2016, Vol. 35 ›› Issue (5) : 89-95.

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (5) : 89-95.
论文

汽轮机非线性间隙气流激振力作用下含裂纹转子的振动特性研究

  • 瓮 雷1,2,杨自春1,2,曹跃云1,2
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Study the Bifurcation Characteristic of a Cracked Rotor-bearing System Under the Air-Exciting Force of Steam Turbine

  • WENG Lei 1,2   YANG Zi-chun1,2  CAO Yue-yun 1,2
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摘要

建立了在汽轮机非线性间隙气流激振力作用下裂纹转子-轴承系统的动力学分析模型,并采用数值积分方法研究此类裂纹转子系统的分岔与混沌特性。利用Poincare截面和分岔图的变化分析汽轮机非线性间隙气流激振力和裂纹深度对系统振动响应特性的影响。分析结果表明:汽轮机非线性间隙气流激振力会使得系统的周期性运动状态提前,且混沌区域发生明显的减小;在浅裂纹时,汽轮机非线性间隙气流激振力对系统的响应起主导作用,且在超临界转速区域出现周期8运动;随着裂纹深度的增加,系统运动的混沌区域逐渐减小几乎消失,在超临界转速区域的逆周期运动演变为较长的周期3运动。研究结果可以作为含裂纹转子在汽轮机非线性间隙气流激振力作用下耦合故障发生的典型特征,也可作为此类耦合故障诊断的依据。

Abstract

The dynamic model of a cracked rotor-bearing system under the air-exciting force of steam turbine was established. Numerical method was adopted to analyze the bifurcation and chaos characteristics of the system, and the effects of the air-exciting force of steam turbine and the depths of the crack on the vibration response of the rotor were discussed by the Poincare’s cross-section, portraits of central point and the bifurcation diagrams. The results indicated that, the dynamic responses of the system advance to occur and the chaotic motion region decreases due to the air-exciting force of the stream turbine. Moreover, the air-exciting force of the stream turbine play a dominant role in case of shallow cracks, and period-eight motions appears in the super-critical speed region. As the depth increase, the chaotic motion region decreases and almost disappears around the critical speed. And the quasi-period motions become a long region for period-three in the super-critical speed region. It indicated that this research may contribution to further understanding of the failure mechanism of such a rotor-bearing system.
 

 

关键词

转子 / 汽轮机非线性间隙气流激振力 / 裂纹 / 非线性振动

Key words

Bifurcation / Rotor-bearing System / Air-exciting force of Steam Turbine / Nonlinear vibration

引用本文

导出引用
瓮 雷1,2,杨自春1,2,曹跃云1,2. 汽轮机非线性间隙气流激振力作用下含裂纹转子的振动特性研究[J]. 振动与冲击, 2016, 35(5): 89-95
WENG Lei 1,2 YANG Zi-chun1,2 CAO Yue-yun 1,2 . Study the Bifurcation Characteristic of a Cracked Rotor-bearing System Under the Air-Exciting Force of Steam Turbine[J]. Journal of Vibration and Shock, 2016, 35(5): 89-95

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