Chaotic noise reduction method for complex electromechanical system monitoring sequence based on LP and wavelet packet

XIE Juntai, FENG Longfei, GAO Jianmin, GAO Zhiyong, GAO Xu

Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (7) : 1-7.

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PDF(980 KB)
Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (7) : 1-7.

Chaotic noise reduction method for complex electromechanical system monitoring sequence based on LP and wavelet packet

  • XIE Juntai, FENG Longfei, GAO Jianmin, GAO Zhiyong,  GAO Xu
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Abstract

Aiming at features of strong noise and chaos existing in monitoring data of process industrial production systems, a signal de-noising method based on the local projection (LP) method and wavelet packet was proposed. Firstly, LP method was used to perform several iterations for a signal’s de-noising from the point of view of dynamic system embedding manifold, and judge iteration termination using correlation dimension number. Then, the wavelet packet method was used to do noise reduction for a noisy signal from the point of view of frequency, suppress inference of high-frequency noise, and obtain better de-noising effect. Lorenz time series was used to do simulation verification. Different levels of noise were added to the time series, and phase space, SNR and the maximum Lyapunov exponent obtained with wavelet packet, LP and the proposed method, respectively were analyzed contrastively. The results showed that the proposed method has better noise reduction effect for medium-high intensity noise. Finally, the proposed method was used to reduce noise of actual monitoring data of a certain compressor unit, and the three methods’ noise reduction effects were evaluated to further verify the superiority of the proposed method.

Key words

local projection (LP) / wavelet packet transform / correlation dimension number / noise reduction

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XIE Juntai, FENG Longfei, GAO Jianmin, GAO Zhiyong, GAO Xu . Chaotic noise reduction method for complex electromechanical system monitoring sequence based on LP and wavelet packet[J]. Journal of Vibration and Shock, 2020, 39(7): 1-7

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