Degradation Fault Feature Extraction of Hydraulic Pump Based on Morphological Undecimated Decomposition

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (22) : 54-61.

Sun Jian Li Hongru WANG Weiguo Xu Baohua

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Abstract

To solve the problem that the vibration signals are strongly nonlinear and the degradation feature is difficult to extract, the degradation feature extraction method based upon morphological undecimated wavelet decomposition fusion (MUWDF) and DCT high order singular entropy is proposed. First of all, the MUWDF algorithm is presented under the framework of morphological undecimated decomposition. The approximate signals of all decomposition layers are selected by feature energy factor and dual-channel vibration signals are fused according to the presented fusion rules so as to increase feature information proportion. On this basement, the high order spectrum analysis algorithm modified by DCT is proposed for further dealing with the fused signal. Singular entropies of Shannon and Tsallis, which are considered as fault degradation feature of hydraulic pump, are respectively achieved by singular value decomposition. Finally, the proposed method is verified by simulation signals and pump vibration signals in various loose slipper degrees.

Key words

degradation feature extraction / morphological undecimated wavelet decomposition fusion / DCT / high order singular entropy

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Sun Jian Li Hongru WANG Weiguo Xu Baohua . Degradation Fault Feature Extraction of Hydraulic Pump Based on Morphological Undecimated Decomposition[J]. Journal of Vibration and Shock, 2015, 34(22): 54-61

References

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