缝类缺陷的Lamb波检测
Lamb Waves Testing of Slot Defects
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的缝类缺陷, 采用一发一收方式, 对缺陷进行Lamb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Lamb波模式; 将时间中心和频率中心作为数字参量, 探讨了缝类缺陷对Lamb波的影响。结果表明, Lamb波信号时间中心的变化与缝类缺陷深度有较好的对应关系。
短时傅里叶变换
时频分析
缝类缺陷
Lamb wave testing
Short time Fourier transform
Time-frequency analysis
Slot defects
Abstract
Slots with different depth were made by WEDM in metal sheet of ST12 to simulate slot-type defects, and the Lamb waves were stimulated by pitch catch method. The time domain signals obtained in the plates with and without defect, respectively, were analyzed in time-frequency domain by Short Time Fourier Transform. The lamb wave modes were recognized successfully, and the effects of slot-type defects on Lamb waves was discussed by the time center and the frequency center as digital parameter. The result showed a good corresponding relationship between slot depth and the time center of the lamb wave.
中图分类号 TG115.28
所属栏目 科研成果与学术交流
基金项目
收稿日期 2009/7/13
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备注杨 齐(1982-), 男, 硕士, 主要研究方向为超声无损检测与评价。
引用该论文: YANG Qi,ZHENG Hui,ZHENG Xiang-Ming,WU Kai-Lei,LI Yun-Tao,ZAI Liang. Lamb Waves Testing of Slot Defects[J]. Nondestructive Testing, 2010, 32(5): 321～324
杨 齐,郑 晖,郑祥明,吴开磊,李运涛,翟 亮. 缝类缺陷的Lamb波检测[J]. 无损检测, 2010, 32(5): 321～324
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参考文献
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【2】Alleyne D, Cawley P. The interaction of lamb waves with defects［J］. IEEE Transactions on Ultrasonics, 1992, 39(3): 381-397.
【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.
【4】Zheng X M, Shi Y W, Lei Y P, et al. Nondestructive characterization of adhesive bond strength by Lamb waves［J］. Insight —— Non-Destructive Testing and Condition Monitoring, 2003, 45(8): 558-565.
【5】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.
【6】胡广书.现代信号处理教程［M］.北京: 清华大学出版社, 2005: 17-19.
【7】龚志强.基于非线性时间序列分析经验模态分解和小波分解异同性的研究［J］.物理学报, 2005, 54(8): 3947-3957.
【8】Sun B, Zhang H. Flow regime identification of gas-liquid two-phase flow based on HHT［J］. Chinese Journal of Chemical Engineering, 2006, 14(1): 24-30.
【9】黄大吉.希尔伯特-黄变换的端点延拓［J］.海洋学报, 2003, 25(1): 1-11.
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