基于CEEMDAN-小波包自适应阈值混凝土声发射信号降噪研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (3) : 139-149.

论文

杨智中1，林军志1，汪魁1，程梓益2，刘攀1

作者信息 +

De-noising of concrete acoustic emission signals based on CEEMD-wavelet packet adaptive threshold

YANG Zhizhong1, LIN Junzhi1, WANG Kui1, CHENG Ziyi2, LIU Pan1

Author information +

文章历史 +

摘要

为了得到更加纯净的混凝土声发射(acoustic emission ,AE)信号来更准确地监测混凝土结构破裂过程，提出了一种完全自适应噪声集合经验模态分解（complete ensemble empirical mode decomposition ,CEEMDAN）与小波包自适应阈值联合方法对循环荷载作用下的混凝土声发射信号进行降噪处理，运用信噪比和快速傅里叶变化（fast Fourier transform ,FFT）分析来验证所用方法的可行性。试验结果表明：结合CEEMDAN-小波包自适应阈值对混凝土声发射信号进行降噪的效果较好，能有效地保留混凝土声发射信号特征信息，对混凝土声发射信号降噪提供新的思路，为后续利用声发射信号分析混凝土结构内部微裂纹扩展及演化特征奠定基础。

Abstract

In order to obtain purer concrete acoustic emission (AE) signals to monitor the fracture process of concrete structures more accurately, a complete ensemble empirical mode decomposition (CEEMDAN) combined with wavelet packet adaptive threshold method is proposed to reduce the noise of concrete AE signals under cyclic load. Signal-Noise Ratio (SNR) and fast Fourier transform (FFT) analysis are used to verify the feasibility of the method. The experimental results show that the noise reduction effect of concrete AE signal combined with CEEMDAN- wavelet packet adaptive threshold is better, which can effectively retain the characteristic information of concrete AE signal, and provide a new idea for concrete AE signal denoising, which lays a foundation for the subsequent use of AE signal to analyze the propagation and evolution characteristics of micro-cracks in concrete structure.

导出引用

杨智中1，林军志1，汪魁1，程梓益2，刘攀1. 基于CEEMDAN-小波包自适应阈值混凝土声发射信号降噪研究[J]. 振动与冲击, 2023, 42(3): 139-149

YANG Zhizhong1, LIN Junzhi1, WANG Kui1, CHENG Ziyi2, LIU Pan1. De-noising of concrete acoustic emission signals based on CEEMD-wavelet packet adaptive threshold[J]. Journal of Vibration and Shock, 2023, 42(3): 139-149

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