金属薄板中缝类缺陷的兰姆波检测
Nondestructive Testing of Slot Defects in Steel Sheet by Lamb Wave
摘 要
在ST12冷轧板上用线切割加工出不同深度的狭缝来模拟钢板中缝类缺陷。采用一发一收和单发单收两种方式对缺陷进行兰姆波检测, 利用短时傅里叶变换对有无缺陷时采集的时域信号进行了时频分析，有效识别出板中激发的兰姆波模式以及模式转换现象。进一步分析发现，试件中激发的主要兰姆波模式的能量分布中心与缺陷深度有较好的对应关系。
短时傅里叶变换
时频分析
Lamb wave testing
Short time Fourier transform
Time-frequency analysis
Abstract
Slots with different depth were made by WEDM in metal sheet of ST12 to simulate slot-type defects. The Lamb wave was stimulated by pitch-catch and pulse-echo method. The time domain signals obtained in the defect-free plate and the defected ones, respectively, were analyzed in time-frequency domain by Short Time Fourier Transform. The lamb wave modes and mode conversion were recognized successfully. There was a good corresponding relationship between slot depth and the energy distribution center of the main Lamb wave mode.
中图分类号 TG115.28
所属栏目 科研成果与学术交流
基金项目 湖北省自然科学基金资助项目(2004ABA019)；湖北省教育厅资助项目(2004D009)；宁波市自然科学基金资助项目(2006A610025)
收稿日期 2007/6/5
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备注郑祥明(1971-)，男，工学博士，副教授，研究方向为超声无损检测与无损评价。
引用该论文: ZHENG Xiang-ming,YANG Qi,HAO Guo-fa,TANG Zheng-lian,ZHANG Chun,WANG Du. Nondestructive Testing of Slot Defects in Steel Sheet by Lamb Wave[J]. Nondestructive Testing, 2007, 29(11): 630～633
郑祥明,杨 齐,郝国法,唐正连,张 春,王 杜. 金属薄板中缝类缺陷的兰姆波检测[J]. 无损检测, 2007, 29(11): 630～633
被引情况:
【1】王 晶,周 波, "铝板结构主动Lamb波扫查合成损伤成像方法",无损检测 32, 246-248(2010)
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参考文献
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【2】葛哲学，陈仲生.MATLAB时频分析技术极其应用[M].北京：人民邮电出版社,2006:2-17.
【3】应崇福，张守玉，沈建中.超声在固体中的散射[M].北京：国防工业出版社,1994:17-19.
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【5】David N Alleyne, Peter Cawley. The interaction of Lamb wave with defects[J]. IEEE Transactions on Ultrasonics,1992,39(3):381-397.
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