| 缝类缺陷的Lamb波检测 |
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| 引用本文： | 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, 0(5): 321-324,331 |
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| 作者姓名： | 杨齐 郑晖 郑祥明 吴开磊 李运涛 翟亮 |
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| 作者单位： | [1]中国特种设备检测研究院,北京100013 [2]宁波工程学院机械工程学院,宁波315016 [3]渤海石油装备中成装备制造公司,天津300280 |
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| 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。
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| 关 键 词： | Lamb波检测 短时傅里叶变换 时频分析 缝类缺陷 |
Lamb Waves Testing of Slot Defects |
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| Affiliation: | YANG Qi,ZHENG Hui,ZHENG Xiang-Ming,WU Kai-Lei,LI Yun-Tao,ZAI Liang (1.China Special Equipment Inspection and Research Institute,Beijing 100013,China;2.School of Mechanical Engineering,Ningbo University of Technology,Ningbo 315016,China;3.Zhongchen Equipment Manufacturing Company of BoHai Petroleum Equipment Manufacturing Co Ltd,Tianjin 300280,China) |
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| 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. |
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| Keywords: | Lamb wave testing Short time Fourier transform Time-frequency analysis Slot defects |
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