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 Ray- leigh beam element considering rotatory inertia effect is con- structed to solve the first three natural frequencies of the cracked rotor with high precision,and the first three frequen- cies 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.
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