关键词: 分形, 分形关联维数, 汽轮机转子, 振动, 故障诊断

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