摘要
采用Disperse软件,计算了3 mm厚度铝合金薄板的水平剪切(Shear horizontal,SH)导波频散曲线,设计制作了中心频率为0.22 MHz的SH导波电磁超声换能器(Electromagnetic acoustic transducer,EMAT),对铝薄板试样中直裂纹进行了B扫成像检测实验分析,采用同步挤压小波变换(Synchrosqueezed wavelet transform,SWT)对来自铝薄板试样中直裂纹SH导波信号进行了去噪处理。实验结果表明,SWT可以去除原始导波信号中的噪声,并实现导波模态分离,有助于改善B扫图像的质量。所设计的SH导波EMAT能够有效地检出3 mm厚铝薄板试样中10 mm长、1 mm宽、2 mm深的人工直裂纹。
In this paper, the Disperse software is used to calculate the dispersion curves of shear-horizontal(SH) guided wave in a 3 mm thick aluminium sheet, an electromagnetic acoustic transducer(EMAT) with a center frequency of 0.22MHz is developed to generate SH guided wave, and the experimental research on B-scan imaging detection of the straight cracks in the aluminium sheet is carried out. The synchrosqueezed wavelet transform(SWT) is used to de-noise the SH guided wave signal from the straight cracks. Experimental results show that SWT can remove the noise in the original guided wave signal, realize the guided wave mode separation and improve the quality of the B-scan image. The designed SH guided wave EMAT can effectively detect the artificial direct crack of 10 mm long, 1 mm wide and 2 mm deep in the 3 mm thick aluminum sheet specimens.
作者
袁阿琳
赖迎庆
石剑
段检发
卢超
石文泽
YUAN Alin;LAI Yingqing;SHI Jian;DUAN Jianfa;LU Chao;SHI Wenze(AECC South Industry Co.,Ltd.Zhuzhou 412000,Hunan,China;Key Laboratory of Nondestructive Testing,Ministry of Education,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China)
出处
《声学技术》
CSCD
北大核心
2022年第2期211-219,共9页
Technical Acoustics
基金
国家自然科学基金(12064001)资助项目。
关键词
铝板
SH导波
电磁超声换能器(EMAT)
同步挤压小波变换
B扫描
aluminium sheet
SH guided wave
electromagnetic acoustic transducer(EMAT)
synchrosqueezed wavelet transform
B-scan
