| APPLICATION OF WAVELET TIME-FR EQUENCY ANALYSIS TO IDENTIFICA-TION OF CRACKED ROTOR |
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| 作者姓名： | Zou JianChen JinPu YapengGeng ZunminState Key Laboratory of Vibration Shock & Noise Shanghai Jiaotong University Shanghai China |
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| 作者单位： | Zou JianChen JinPu YapengGeng ZunminState Key Laboratory of Vibration，Shock & Noise，Shanghai Jiaotong University，Shanghai 200030，China |
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| 基金项目： | This project is supported by National Natural Science Foundation of China (No.10176014)，National Fundamental Foundation of Research and Development of China (No.G1998020321). |
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| 摘 要： | Based on the simple hinge crack model and the local flexibility theorem, the corresponding dynamic equation of the cracked rotor is modelled, the numerical simulation solutions of the cracked rotor and the uncracked rotor are obtained. By the continuous wavelet time-frequency transform, the wavelet time-frequency properties of the uncracked rotor and the cracked rotor are discussed. A new detection algorithm that uses the wavelet time-frequency transform to identify the crack is proposed. The influence of the sampling frequency on the wavelet time-frequency transform is analyzed by the numerical simulation research. The valid sampling frequency is suggested. Experiments demonstrate the validity and availability of the proposed algorithm in identification of the cracked rotor for engineering practices.
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APPLICATION OF WAVELET TIME-FR EQUENCY ANALYSIS TO IDENTIFICATION OF CRACKED ROTOR |
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| Zou JianChen JinPu YapengGeng ZunminState Key Laboratory of Vibration,Shock & Noise,Shanghai Jiaotong University,Shanghai ,China.APPLICATION OF WAVELET TIME-FR EQUENCY ANALYSIS TO IDENTIFICA-TION OF CRACKED ROTOR[J].Chinese Journal of Mechanical Engineering,2003,16(1). |
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| Authors: | Zou Jian Chen Jin Pu Yapeng Geng Zunmin |
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| Abstract: | Based on the simple hinge crack model and the local flexibility theorem, the corresponding dynamic equation of the cracked rotor is modelled, the numerical simulation solutions of the cracked rotor and the uncracked rotor are obtained. By the continuous wavelet time-frequency transform, the wavelet time-frequency properties of the uncracked rotor and the cracked rotor are discussed. A new detection algorithm that uses the wavelet time-frequency transform to identify the crack is proposed. The influence of the sampling frequency on the wavelet time-frequency transform is analyzed by the numerical simulation research. The valid sampling frequency is suggested. Experiments demonstrate the validity and availability of the proposed algorithm in identification of the cracked rotor for engineering practices. |
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| Keywords: | Wavelet Time-frequency analysis Cracked rotor Identification |
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