A study on noise reduction of AE signal of sealing friction surface under the synergy of local characteristic-scale decomposition and wavelet threshold

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (12) : 205-211.

LU Junjie1,LIU Zhu1,2,DING Xuexing2,DING Junhua2,GAO De1

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Abstract

According to the common problem of internal signal coupling and external interference factors a synergistic noise reduction method is proposed, which based on local characteristic-scale decomposition (Local Characteristic-scale Decomposition) and wavelet threshold in the low-speed stage of mechanical seals. Based on the information mapping relationship between local feature scale decomposition combined with wavelet threshold method and acoustic emission signal noise reduction, a cross-correlation coefficient, which is identification mechanism for noisy components, is established, and the pure components and the denoised noise components are reconstructed to achieve signal reduction. noise, and built a mechanical seal acoustic emission test bench. The test results show that the noise reduction effect of LCD-new threshold noise reduction method is better than LCD forced noise reduction and wavelet threshold noise reduction, and the signal-to-noise ratio of LCD-new threshold noise reduction is higher than LCD forced noise reduction and wavelet threshold noise reduction are 20% and 23% higher. Therefore, it is proved that the noise reduction technology based on the acoustic emission signal of the seal in conjunction with the wavelet threshold at the local characteristic scale maintains the availability of the signal, guarantees the fault characteristics of the signal, and lays a theoretical foundation for the full life cycle management of the mechanical seal.

Key words

Mechanical seal / Start and stop / Signal noise reduction / sound emission / LCD-Wavelet threshol

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LU Junjie1,LIU Zhu1,2,DING Xuexing2,DING Junhua2,GAO De1. A study on noise reduction of AE signal of sealing friction surface under the synergy of local characteristic-scale decomposition and wavelet threshold[J]. Journal of Vibration and Shock, 2023, 42(12): 205-211

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