Experimental Research on Defect Detection of Laser-induced Lamb Waves Based on Wavenumber Analysis

被引：0
|
作者：
Liu Z. [1 ,2 ]
Feng X. [1 ,2 ]
Chen H. [1 ,2 ]
He C. [1 ,2 ]
Wu B. [1 ,2 ]
机构：
[1] College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing
[2] Beijing Engineering Research Center of Precision Measurement Technology and Instruments, Beijing University of Technology, Beijing
来源：
Liu, Zenghua (liuzenghua@bjut.edu.cn) | 2018年 / Chinese Mechanical Engineering Society卷 / 54期
关键词：
Continuous wavelet transform; Laser-induced Lamb waves; Short-space two-dimensional Fourier transform; Two-dimensional Fourier transform; Wavenumber;
D O I：
10.3901/JME.2018.18.023
中图分类号：
学科分类号：
摘要：
It is difficult to realize the quantitative detection of defects by using the time domain or frequency domain features of Lamb wave signals due to their dispersion and multi-modal characteristics. The study of defect detection quantitatively in aluminum plates is carried out by means of wavenumber analysis based on the full-optical laser ultrasonic testing system. The time-space wavefield signals are obtained by pulse laser in the fixed location excitation and continuous laser one-dimensional scanning acquisition, where the propagation characteristics of Lamb wave signal and the regular pattern of interaction between Lamb wave signal and defect can be visually displayed. The two-dimensional Fourier transform is used to convert the wavefield signal from the time-space domain to the frequency-wavenumber domain where individual modes included in the signals are well discernible. Based on the idea of short-time Fourier transform, for retaining the space information, a short-space two-dimensional Fourier transform is adopted to obtain the distribution of wavenumber along the scanning path, where the location and size of defect can be visually displayed. Furthermore, the thickness of the aluminum plates in the defect area can be calculated based on the relationship between the wavenumber and the frequency-thickness product. Experimental results show that the method can effectively evaluate the location, size and depth of the defects. © 2018 Journal of Mechanical Engineering.
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页码：23 / 32
页数：9
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