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Abstract: The
dynamic equation of cracked rotor is modelled, which is based on the
simple hinge crack model and the local flexibility theorem. The
numerical simulation solutions of the uncracked rotor and the cracked
rotor are obtained from the model, the phase of Fourier transform is
calculated. By the continuous wavelet transform, the amplitude and phase
wavelet map features of the uncracked rotor and the cracked rotor are
investigated. A new detection algorithm using amplitude and phase
wavelet map to identify the crack is proposed. The influence of scale
factor on the accuracy and validity of the amplitude and phase wavelet
map is analyzed through simulation research; the preferred scale factor
is suggested. Experiments verify the availability and validity of the
amplitude and phase wavelet map in identification of cracked rotor for
engineering practices.
Key words: Amplitude Phase Wavelet map Cracked rotor Fault diagnosis
Scale factor
CLC No: TH113.1
国家973重点基础研究规划项目(G1998020321), 国家自然科学基金(10176014)和振动、冲击、噪声国家重点实验室开放基金(VSN-2002-03)资助项目.
Received 20020109, received in revised form 20020720
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