Journal of South China University of Technology (Natural Science Edition) ›› 2006, Vol. 34 ›› Issue (4): 85-90.

• Power & Electrical Engineering • Previous Articles     Next Articles

Fault Diagnosis of Steam-Turbine Rotor Vibration Based on Fractal Correlation Dimension

Liang Ping  Long Xin-feng  Fan Fu-mei   

  1. 1.College of Electric Power,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China;2.College of Chemical and Energy Engineering，South China Univ.of Tech.,Guangzhou 510640,Guangdong,China;3.Guangdong Power Industry School,Guaugzhou 510520,Guangdong,China
  • Received:2005-04-05 Online:2006-04-25 Published:2006-04-25
  • Contact: 梁平(1953-)，男，博士，副教授，主要从事传热与节能、汽轮机转子振动故障诊断与预测研究。 E-mail:mrpliang@126.com
  • About author:梁平(1953-)，男，博士，副教授，主要从事传热与节能、汽轮机转子振动故障诊断与预测研究。
  • Supported by:

    广东省自然科学基金资助项目(020875)

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Abstract:

This paper experimentally investigates the vibration faults of the steam-turbine rotor,such as the rub-bing,the loosening,the uncountershaft and the mass unbahmce,using the Bently experiment table.According to the theory of Phase Space Reconstruction,the vibration signal serial,a kind of random fractal that meets the statis-tical self-similarity,is reconstructed.By the calculation of fractal dimension,the dynamic characteristics of the sys-tem are then reproduced.The results show that the fractal correlation dimension of rubbing fault is the largest while those of the loosening fault and the uncountershaft fault are a little lower,and that of the mass unbalance fault is the smallest.It is also shown that different types of faults resuh in different fractal corelation dimension incre-ments.Therefore,the fractal corelation dimension can be abstracted as a sign of vibration fault．

Key words: fractal, fractal corelation dimension, steam-turbine rotor, vibration, fault diagnosis