Preprocessing method of hydraulic pump vibration signal based on FastPW and CNC de-noising

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (24) : 144-149.

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Preprocessing method of hydraulic pump vibration signal based on FastPW and CNC de-noising

WANG Yu-kui, LI Hong-ru, YE Peng

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Abstract

Aiming at the existing problem of discrete cosine transform (DCT) threshold de-noising method, an adaptive de-noising method named cosine neighboring coefficients (CNC) is put forward, and the results which are gotten by performing CNC de-noising to simulation signal demonstrated that the proposed method has more excellent performance. A novel method for the preprocessing of hydraulic pump vibration signal is proposed based on the combination of fast pre-whitening (FastPW) and cosine neighboring coefficients (CNC) de-noising method. Firstly, the pre-whitening (PW) signal which only includes shocking components and noise is gained by performing FastPW to the original signal, and the harmonic component of the original signal is removed. And then the de-noising processing is preformed to PW signal with CNC de-noising method. The analysis results of the practical signal testified that the proposed method can remove the harmonic component and noise preferably and reserve the fault component in the signal more excellently.

Key words

signal pre-whitening / DCT / neighboring coefficients / hydraulic pump / preprocessing

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WANG Yu-kui;LI Hong-ru;YE Peng. Preprocessing method of hydraulic pump vibration signal based on FastPW and CNC de-noising[J]. Journal of Vibration and Shock, 2014, 33(24): 144-149