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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Waveform design for high-resolution damage detection using lamb waves [Correspondence]
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Waveform design for high-resolution damage detection using lamb waves [Correspondence]

机译：使用兰姆波的高分辨率损伤检测的波形设计[通讯]

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摘要

Dispersion is encountered very often in ultrasonic guided waves, and may decrease the performance for damage detection significantly. For this reason, many signal processing methods have been proposed to obtain each mode under serious dispersion. In this paper, a new scheme is established for waveform design to suppress the dispersion such that each wave packet can be separated clearly. In this method, the dispersion effect of the guided wave is pre-compensated for a particular distance as it propagates through the structure. The relationship between the resolvable resolution and the waveform parameters is discussed; this relationship is employed as a guide to separately identify the wave packets caused by different structural features. Subsequently, an experiment is carried out to compare the performance of the proposed method with the time-reversal method. By using the proposed method, closely distributed structural features can be recognized with ease in the time domain.
机译：在超声波导波中经常会遇到色散，并且色散可能会大大降低损坏检测的性能。为此，已经提出了许多信号处理方法来在严重色散下获得每种模式。在本文中，建立了一种新的波形设计方案，以抑制色散，从而可以清楚地分离每个波包。在这种方法中，当引导波传播通过结构时，它会针对特定距离预先补偿其色散效应。讨论了可分辨分辨率与波形参数之间的关系。该关系被用作分别识别由不同结构特征引起的波包的指南。随后，进行了一个实验，以比较该方法与时间反转方法的性能。通过使用提出的方法，可以在时域轻松识别紧密分布的结构特征。

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