Page 132 - 《应用声学》2025年第1期

第 44 卷 第 1 期 Vol. 44, No. 1
2025 年 1 月 Journal of Applied Acoustics January, 2025

⋄ 研究论文 ⋄

改进CEEMD-WPT的裂纹声发射信号降噪方法 ∗

张润锋 1 赵永峰 2 陈江义 1 沈 鹏 1†

(1 郑州大学机械与动力工程学院 郑州 450001)
(2 国网河南省电力公司电力科学研究院 郑州 450052)
摘要：针对裂纹声发射信号的降噪问题，该文提出了结合互补集合经验模态分解 (CEEMD) 与小波包变换
(WPT) 的 CEEMD-WPT 降噪方法。首先，此方法将传统 CEEMD 中使用的单一经验模态分解 (EMD) 改进
为降噪效果更稳定的 WPT-EMD；其次，分解后对其本征模态函数进行了相关系数阈值判断，对低相关分量再
次进行 WPT 处理。除此之外，为了解决难以量化真实信号降噪效果的问题，文中设计了新的量化指标 “信号
主区间系数”，并用仿真实验验证了该参数的可靠性。该文最后对公开数据集和裂纹实验信号进行了降噪实
验，结果表明相较于传统 CEEMD 和小波阈值，CEEMD-WPT 有着更好的降噪效果；并且 CEEMD-WPT 降
噪统计方差小于 CEEMD 一个数量级，具有更强的稳定性。
关键词：裂纹声发射信号；CEEMD-WPT；WPT-EMD；信号主区间系数；降噪稳定性
中图法分类号: TN911.7; TN911.6 文献标识码: A 文章编号: 1000-310X(2025)01-0128-12
DOI: 10.11684/j.issn.1000-310X.2025.01.013

Improved noise reduction of crack acoustic emission signal of CEEMD-WPT

1
2
1
ZHANG Runfeng , ZHAO Yongfeng , CHEN Jiangyi and SHEN Peng 1
(1 School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China)
(2 Electric Power Research Institute of State Grid Henan Electric Power Company, Zhengzhou 450052, China)

Abstract: Addressing the noise reduction problem of cracked acoustic emission signals, the paper proposes a
CEEMD-WPT noise reduction method that combines complementary ensemble empirical modal decomposition
(CEEMD) and wavelet packet (WPT). Firstly, this method improves the single empirical modal decomposition
(EMD) decomposition used in the traditional CEEMD into the WPT-EMD with a more stable noise reduction
effect; Secondly, after decomposition, the threshold value of correlation coefficient is determined for the intrinsic
mode function, and the low correlation component was processed again by WPT. In addition, in order to
solve the problem that it is difficult to quantify the real signal noise reduction effect, a new quantization
index ”signal principal interval coefficient” was designed in this paper, and the reliability of this parameter
was verified by experiments. Finally, the noise reduction experiment is carried out on the public data set and
the crack experimental signal. The results show that compared with traditional CEEMD and wavelet threshold,
CEEMD-WPT has a better noise reduction effect. Moreover, the statistical variance of CEEMD-WPT noise
reduction is one order of magnitude smaller than that of CEEMD, which has stronger stability.
Keywords: Crack acoustic emission signal; CEEMD-WPT; WPT-EMD; Signal principal interval coefficient;
Noise reduction stability

2023-09-18 收稿; 2024-02-29 定稿
河南省重大科技专项 (221100220100), 国网河南省电力公司项目 (SGHADK00DYJS2100546)
∗
作者简介: 张润锋 (1998– ), 男, 河南人, 硕士研究生, 研究方向: 声发射。
† 通信作者 E-mail: shenpengmtr@163.com