| 薄板声——超声检测信号的时频分析研究 |
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| 引用本文： | 车飞,彭伟.薄板声——超声检测信号的时频分析研究[J].南昌航空工业学院学报,2007,21(3):36-40. |
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| 作者姓名： | 车飞 彭伟 |
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| 作者单位： | 南昌航空大学 江西南昌330063 |
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| 摘 要： | 本文以兰姆波的群速度-频厚积频散曲线为基础,采用基于短时傅立叶变换的时-频分析方法,对薄板中传播的声-超声信号进行了处理分析。对厚度为2 mm薄钢板的声-超声检测实验结果证实,在声-超声检测形式下激发的超声波的主要成分是多模式的兰姆波。与现有文献中介绍的基于时间域识别的薄板声-超声信号分析方法相比,时-频分析方法不仅可以很好地识别兰姆波模式,而且可对各模式波的能量成分进行分析。
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| 关 键 词： | 声-超声检测 兰姆波 时频分析 短时傅里叶变换 |
| 文章编号： | 1001-4926（2007）03-0036-05 |
| 收稿时间： | 2007-08-11 |
| 修稿时间： | 2007年8月11日 |
Study on time-frequency analysis for acousto-ultrasonic testing signal in thin plates |
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| CHE Fei,PENG Wei.Study on time-frequency analysis for acousto-ultrasonic testing signal in thin plates[J].Journal of Nanchang Institute of Aeronautical Technology(Natural Science Edition),2007,21(3):36-40. |
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| Authors: | CHE Fei PENG Wei |
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| Abstract: | Based on the curve of group velocity-frequency multiply thickness.The time-frequency analysis method based on short time Fourier transform is used for analysis of acousto-ultrasonic signal which propagates in thin plate.The result of acousto-ultrasonic testing experiment of the thin plates of 2mm in thickness makes clear that in the acousto-ultrasonic technique,the excited Lamb waves are multimode Lame waves.Compared with acousto-ultrasonic signal analysis in the thin plate which is based on time field,time-frequency analysis can not only recognize Lamb wave mode but also can analyze energy component of each wave mode. |
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| Keywords: | acousto-ultrasonic testing Lamb wave time-frequency analysis short time Fourier transforms |
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