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

被引：0
|
作者：
Li S. [1 ,2 ]
Wang Z. [1 ,2 ]
Kang Y. [1 ,2 ]
Hou J. [1 ,2 ]
机构：
[1] School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou
[2] Machinery Industry Pump and Special Valve Engineering Research Center, Lanzhou University of Technology, Lanzhou
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2021年 / 40卷 / 12期
关键词：
Layered threshold; Noise test system; Safety valve; Threshold function; Wavelet noise reduction;
D O I：
10.13465/j.cnki.jvs.2021.12.018
中图分类号：
学科分类号：
摘要：
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. © 2021, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：143 / 150
页数：7
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