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A fault feature extraction method of gearbox based on compound dictionary noise reduction and optimized fourier decomposition

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Journal of Southeast University(English Edition) 2021年第1期37卷 22-32页

作者： Mao Yifan Xu Feiyun School of Mechanical Engineering Southeast UniversityNanjing 211189China

Aimed at the problem that fourier decomposition method(FDM)is sensitive to noise and existing mode mixing cannot accurately extract gearbox fault features,a gear fault feature extraction method combining compound dictionary noise reduction and optimized FDM(OFDM)is ***,the characteristics of the gear signals are used to construct a compound dictionary,and the orthogonal matching pursuit algorithm(OMP)is combined to reduce the noise of the vibration ***,in order to overcome the mode mixing phenomenon occuring during the decomposition of FDM,a method of frequency band division based on the extremum of the spectrum is proposed to optimize the decomposition ***,the OFDM is used to decompose the signal into several analytic fourier intrinsic band functions(AFIBFs).Finally,the AFIBF with the largest correlation coefficient is selected for Hilbert envelope spectrum *** fault feature frequencies of the vibration signal can be accurately *** proposed method is validated through analyzing the gearbox fault simulation signal and the real vibration signals collected from an experimental gearbox.

关键词： fourier decomposition compound dictionary mode mixing gearbox fault feature extraction

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Analysis of Simulation Model on Tank’s Foundation Settlement

Analysis of Simulation Model on Tank’s Foundation Settlemen...

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2018远东无损检测新技术论坛

作者： Yongtao ZHAO ZengxiaoZHANG Yanfei CHEN Fangyu LOU CNPC Research Institute of Safety & Environment Technology Mechanical and Transportation Engineering College China University of Petroleum(Beijing)

Many large oil storage tank bases in China are built among areas along sea, and the foundation of storage tank is vulnerable to settlement, which can cause negative effect on the safety of storage tank. fourier decomposition method is used to process the actual measured data of storage tank’s foundation settlement, depending on which three different finite element models of storage tank are established for calculation. Based on the result of calculation, the behavior of tank under foundation settlement is analyzed and assessment on three models is made through comparison. Conclusions drawn from the analysis can offer guidance to the maintenance of tank safety.

关键词： safety of storage tank foundation settlement fourier decomposition finite element model

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