| NEW METHOD FOR WEAK FAULT FEATURE EXTRACTION BASED ON SECOND GENERATION WAVELET TRANSFORM AND ITS APPLICATION |
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| 引用本文： | Duan Chendong He ZhengjiaJiang HongkaiSchool of Mechanical Engineering,Xi''''an Jiaotong University,Xi''''an 710049,China. NEW METHOD FOR WEAK FAULT FEATURE EXTRACTION BASED ON SECOND GENERATION WAVELET TRANSFORM AND ITS APPLICATION[J]. 机械工程学报(英文版), 2004, 17(4): 543-547 |
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| 作者姓名： | Duan Chendong He ZhengjiaJiang HongkaiSchool of Mechanical Engineering Xi''''an Jiaotong University Xi''''an 710049 China |
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| 作者单位： | Duan Chendong He ZhengjiaJiang HongkaiSchool of Mechanical Engineering，Xi'an Jiaotong University，Xi'an 710049，China |
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| 基金项目： | ThisprojectissupportedbyKeyProjectofNationalNaturalScienceFoundationofChina(No.50305033)NationalScienceFoundationofChina(No.50175087,No.50305012). |
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| 摘 要： | A new time-domain analysis method that uses second generation wavelet transform (SGWT) for weak fault feature extraction is proposed. To extract incipient fault feature, a biorthogonal wavelet with the characteristics of impact is constructed by using SGWT. Processing detail signal of SGWT with a sliding window devised on the basis of rotating operation cycle, and extracting modulus maximum from each window, fault features in time-domain are highlighted. To make further analysis on the reason of the fault, wavelet package transform based on SGWT is used to process vibration data again. Calculating the energy of each frequency-band, the energy distribution features of the signal are attained. Then taking account of the fault features and the energy distribution, the reason of the fault is worked out. An early impact-rub fault caused by axis misalignment and rotor imbalance is successfully detected by using this method in an oil refinery.
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| 关 键 词： | 二次退化小波变换 小波包 不平衡性 旋转循环 双正交 傅里叶变换 |
NEW METHOD FOR WEAK FAULT FEATURE EXTRACTION BASED ON SECOND GENERATION WAVELET TRANSFORM AND ITS APPLICATION |
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| DuanChendong HeZhengjia JiangHongkai. NEW METHOD FOR WEAK FAULT FEATURE EXTRACTION BASED ON SECOND GENERATION WAVELET TRANSFORM AND ITS APPLICATION[J]. Chinese Journal of Mechanical Engineering, 2004, 17(4): 543-547 |
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| Authors: | DuanChendong HeZhengjia JiangHongkai |
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| Abstract: | A new time-domain analysis method that uses second generation wavelet transform (SGWT) for weak fault feature extraction is proposed. To extract incipient fault feature, a biorthogonal wavelet with the characteristics of impact is constructed by using SGWT. Processing detail signal of SGWT with a sliding window devised on the basis of rotating operation cycle, and extracting modulus maximum from each window, fault features in time-domain are highlighted. To make further analysis on the reason of the fault, wavelet package transform based on SGWT is used to process vibration data again. Calculating the energy of each frequency-band, the energy distribution features of the signal are attained. Then taking account of the fault features and the energy distribution, the reason of the fault is worked out. An early impact-rub fault caused by axis misalignment and rotor imbalance is successfully detected by using this method in an oil refinery. |
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| Keywords: | Second generation wavelet transform (SGWT) Wavelet package transform Misalignment Imbalance Impact-rub |
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