|
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 location and size. The numerical and experimental examples are given to verify the validity of the beam element for crack quantitative identification in rotor systems. The new method can be applied to prognosis and quantitative diagnosis of crack in rotor systems.
Key words: Wavelet finite element Rotor cracks Fault diagnosis
CLC No: TH113.1 TH17
国家自然科学基金(50335030, 50505033)、国家重点基础研究发展计划(973计划, 2005CB724100)和陕西省自然科学基础研究计划(2005E219)资助项目. Received 20060411,
received in revised form 20060810
|