Noise Reduction of Welding Crack AE Signal Based on EMD and Wavelet Packet

Sensors

Yanfeng Peng¹  Qinghua Lu²  Kuanfang He²  Zixiong Xia²  Yin Si² 

[1] Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, China;School of Mechatronics Engineering, Foshan University, Foshan 528000, China;

关键词: welding crack;    ae signal;    noise reduction;    emd;    wavelet packet;   

DOI  :  10.3390/s20030761

来源: DOAJ

【 摘 要 】

The acoustic emission (AE) signal collected by a sensor in the welding process has an overlapping frequency band and weak characteristics under a complex noise background. It is difficult for the wavelet noise reduction method, with single basis function, to effectively match the different characteristic information of the welding crack AE signal. Taking into account the adaptive decomposition characteristics of Empirical Mode Decomposition (EMD), a novel wavelet packet noise reduction method for welding AE signal was proposed. The welding AE signal was adaptively decomposed into several Intrinsic Mode Functions (IMFs) by the EMD. The effective IMFs were selected by the frequency distribution characteristics of the welding crack AE signal. A wavelet packet, with a specific basis function, was subsequently performed on the effective IMFs, which were reconstructed to be the welding crack AE signal. The simulated and experimental results indicated that the proposed method can effectively achieve noise reduction of the welding crack AE signal, which provided a mean for structure crack detection in the welding process.

【 授权许可】

Unknown