Noise reduction of a safety valve pressure relief signal based on an improved wavelet threshold function

LI Shuxun1,2,WANG Zhihui1,2,KANG Yunxing1,2,HOU Jianjun1,2

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (12) : 143-150.

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (12) : 143-150.

Noise reduction of a safety valve pressure relief signal based on an improved wavelet threshold function

  • LI Shuxun1,2,WANG Zhihui1,2,KANG Yunxing1,2,HOU Jianjun1,2
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Abstract

:In a safety valve test, the discharge acoustic signal of the safety valve is an important source of information to check whether the valve is qualified.In view of the fact that the discharge sound signal of the safety valve is easily interfered by the noise of the surrounding mechanical system, which affects the accuracy of the test, an improved adaptive wavelet threshold noise reduction method was proposed using the attenuation characteristics of the exponential function.Firstly, the optimal threshold was selected adaptively at different scales according to the noise level of wavelet decomposition; then a threshold function was constructed that is continuous at the threshold, and adjustment factors were introduced to optimize the traditional threshold function for excessive noise reduction and discontinuity.This method was used to analyze the noise reduction of a simulated signal and the measured signal of the safety valve, and compare it with the traditional wavelet threshold noise reduction and low-pass Butterworth filter noise reduction.The results show that the noise reduction effect of this method is better, and the effectiveness of the improved noise reduction method was verified.

Key words

wavelet noise reduction / threshold function / layered threshold / safety valve / noise test system

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LI Shuxun1,2,WANG Zhihui1,2,KANG Yunxing1,2,HOU Jianjun1,2. Noise reduction of a safety valve pressure relief signal based on an improved wavelet threshold function[J]. Journal of Vibration and Shock, 2021, 40(12): 143-150

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