电子测量与仪器学报

常俊杰,万陶磊,钟海鹰.短空间二维傅里叶变换对铝板的损伤定量研究[J].电子测量与仪器学报,2020,34(6):102-108

短空间二维傅里叶变换对铝板的损伤定量研究

Quantitative study of short-space two-dimensional Fourier transform on aluminum plate damage

DOI：

英文关键词:short-space Fourier transform Lamb wave air-coupled ultrasound depth quantitative positioning

基金项目:国家自然科学基金(11464030)资助项目

作者	单位
常俊杰	1. 南昌航空大学无损检测技术教育部重点实验室，2. 日本探头株式会社
万陶磊	1. 南昌航空大学无损检测技术教育部重点实验室
钟海鹰	1. 南昌航空大学无损检测技术教育部重点实验室

Author	Institution
Chang Junjie	1. Key Lab of Nondestructive Testing, Minisrty of Education, Nanchang Hangkong University,2. Japan Probe Co. Ltd
Wan Taolei	1. Key Lab of Nondestructive Testing, Minisrty of Education, Nanchang Hangkong University
Zhong Haiying	1. Key Lab of Nondestructive Testing, Minisrty of Education, Nanchang Hangkong University

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中文摘要:

针对 Lamb 波对铝板损伤定量难的问题,使用短空间二维傅里叶变换的方法对其进行了研究。首先,使用空气耦合超声在铝板中激励 Lamb 波并进行线性扫查获取其时间-空间波场信号;然后,对信号进行短空间二维傅里叶变换获取扫查区域的 Lamb 波空间-波数曲线,并从中得到损伤的位置、长度和深度信息;最后,根据相速度-频厚积曲线反推出损伤的深度。结果表明,所提方法能够同时对扫查区域的板厚以及损伤的位置、长度和深度进行评估。其中,板厚定量误差最大为 5. 50%,损伤长度和深度的定量误差最大分别为 6. 00%和 6. 67%。

英文摘要:

Aiming at the problem that Lamb wave is difficult to quantify the damage of aluminum plate, a short-space two-dimensional Fourier transform method is used to study it. Firstly, the Lamb wave is excited in aluminum plate by air coupled ultrasound and its timespace wave field signals is obtained by linear scanning. Then, the short space two-dimensional Fourier transform is used to obtain the Lamb wave space-wavenumber curve of the scanning area, and the location, length and depth of the damage are obtained. Finally, the depth of damage is deduced from the phase velocity frequency-thickness product curve. The results show that the proposed method can simultaneously evaluate the plate thickness of the scanning area and the location, length and depth of the damage. Among them, the maximum quantitative error of plate thickness is 5. 50%, and the maximum quantitative error of damage length and depth is 6. 00% and 6. 67%.

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