Quantitative Identification of Multiple Cracks in a Rotor Utilizing Wavelet Finite Element Method
Bing Li; Hongbo Dong

doi:10.3970/cmes.2012.084.205
Source CMES: Computer Modeling in Engineering & Sciences, Vol. 84, No. 3, pp. 205-228, 2012
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Keywords Multiple cracks; Rotor; Identification; Wavelet finite element method
Abstract Different from single crack identification method, the number of cracks should be firstly identified, and then the location and depth of each crack can be predicted for multiple cracks identification technology. This paper presents a multiple crack identification algorithm for rotor using wavelet finite element method. Firstly, the changes in natural frequency of a structure with various crack locations and depths are accurately obtained by means of wavelet finite element method; and then the damage coefficient method is used to determine the number and region of cracks. Finally, by finding the points of intersection of three frequency contour lines in the small region containing crack, the crack location and depth can be predicted. Multiple cracks diagnostic examples in rotor under two working conditions have shown the effectiveness of current method: with a maximum error of crack location identification 0.6% and of crack depth identification 0.7%.
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