Frequency-sweep examination for wave mode identification in multimodal ultrasonic guided wave signal

Fateri S.; Boulgouris N.V.; Wilkinson A.; Balachandran W.; Gan T.-H.

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Frequency-sweep examination for wave mode identification in multimodal ultrasonic guided wave signal

机译：扫频检查在多模态超声导波信号中的波模式识别

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摘要

Ultrasonic guided waves can be used to assess and monitor long elements of a structure from a single position. The greatest challenges for any guided wave system are the plethora of wave modes arising from the geometry of the structural element which propagate with a range of frequencydependent velocities and the interpretation of these combined signals reflected by discontinuities in the structural element. In this paper, a novel signal processing technique is presented using a combination of frequency-sweep measurement, sampling rate conversion, and Fourier transform. The technique is applied to synthesized and experimental data to identify different modes in complex ultrasonic guided wave signals. It is demonstrated throughout the paper that the technique also has the capability to derive the time of flight and group velocity dispersion curve of different wave modes in field inspections.

机译：超声波导波可用于从单个位置评估和监视结构的长单元。对于任何导波系统来说，最大的挑战是由结构元件的几何形状引起的过多的波模，这些波模以一定的频率依赖性速度传播，并且对由结构元件中的不连续性反映的这些组合信号的解释。在本文中，提出了一种新颖的信号处理技术，它将扫频测量，采样率转换和傅立叶变换相结合。该技术应用于合成和实验数据，以识别复杂的超声波导波信号中的不同模式。整篇论文都证明了该技术还具有导出飞行时间和不同波模群速度色散曲线的能力。

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来源
《IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control》 |2014年第9期|1515-1524|共10页
作者
Fateri S.; Boulgouris N.V.; Wilkinson A.; Balachandran W.; Gan T.-H.;
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作者单位

Center for Electronic Systems Research (CESR), Brunel University, London, UK;

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正文语种 eng
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关键词
Acoustics; Dispersion; Fourier transforms; Frequency control; Frequency conversion; Inspection; Time-frequency analysis;

机译：声学;分散;傅立叶变换;频率控制;变频;检查;时频分析;

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Frequency-sweep examination for wave mode identification in multimodal ultrasonic guided wave signal

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