QUANTITATIVE IDENTIFICATION OF ROTOR CRACKS BASED ON FINITE ELEMENT OF B-SPLINE WAVELET ON THE INTERVAL

Abstract

Abstract: Based on finite element of B-spline wavelet on the interval (BSWI), the quantitative identification method of transverse crack for rotor systems is studied. The BSWI Rayleigh beam element considering rotatory inertia effect is constructed to solve the first three natural frequencies of the cracked rotor with high precision, and the first three frequencies solution curve surfaces of normalized crack location and size are obtained by using surface-fitting technique. Then the first three metrical natural frequencies are employed as inputs of the solution curve surfaces. The intersection of the three frequencies contour lines can predict the normalized crack lo-cation and size. The numerical and experimental examples are given to verify the validity of the beam element for crack quan-titative identification in rotor systems. The new method can be applied to prognosis and quantitative diagnosis of crack in rotor systems.

Key words: Fault diagnosis, Rotor cracks, Wavelet finite element

CLC Number:

TH113.1 TH17

CHEN Xuefeng;XIANG Jiawei;DONG Hongbo;HE Zhengjia. QUANTITATIVE IDENTIFICATION OF ROTOR CRACKS BASED ON FINITE ELEMENT OF B-SPLINE WAVELET ON THE INTERVAL[J]. , 2007, 43(3): 123-127.

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QUANTITATIVE IDENTIFICATION OF ROTOR CRACKS BASED ON FINITE ELEMENT OF B-SPLINE WAVELET ON THE INTERVAL

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