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《Journal of Vibration and Shock》 2015-22
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Degradation feature extraction of hydraulic pump based on morphological undecimated decomposition fusion and DCT high order singular entropy

SUN Jian;LI Hong-ru;WANG Wei-guo;XU Bao-hua;Ordnance Engineering College;  
To solve the problem that vibration signals of a hydraulic pump as usual are strongly nonlinear and its degradation features are difficult to extract,a degradation feature extraction method based upon morphological undecimated wavelet decomposition fusion( MUWDF) and DCT high order singular entropy was proposed. The MUWDF algorithm was presented under the general framework of morphological undecimated decomposition. The approximate signals of all decomposition layers were selected by using the feature energy factor and dual-channel vibration signals were fused according to the presented fusion rules so as to increase the proportion of feature information. On this basis,a high order spectrum analysis algorithm modified by DCT was proposed for further dealing with the fused signal. Shannon and Tsallis singular entropies,which were considered as fault degradation features of hydraulic pump,were respectively achieved by singular value decomposition. Finally,the proposed method was verified by using simulation signals and real pump vibration signals in various working conditions.
【Fund】: 国家自然科学基金资助项目(51275524)
【CateGory Index】: TH137.51
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