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Ultrasonic zero-lag cross correlation based on frequency-wavenumber domain analysis for internal delamination detection

机译:基于频率波数域分析的超声零滞后互相关检测

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摘要

This paper proposes a zero-lag cross correlation (ZLCC) method based on frequency-wavenumber (f-k) domain analysis for internal delamination detection in composite structures. The proposed ZLCC method is able to identify and localise hidden delamination inside composite layers without relying on baseline data accumulated from the pristine condition of a target structure, making it possible to minimise false alarms caused by environmental effects. The ZLCC method is theoretically developed by investigating the physical relationship between ZLCC and ultrasonic wave interaction with delamination. Then, it is numerically validated using a 2D finite element model. The finite element analysis results reveal that internal delamination is successfully localised and highlighted by ZLCC.
机译:本文提出了一种基于频率 - 波数(F-K)域分析的零滞横相关(ZLCC)方法,用于复合结构中的内部分层检测。 所提出的ZLCC方法能够识别和定位内部复合层内的隐藏分层,而不依赖于从目标结构的原始状态累积的基线数据,使得可以最小化由环境效应引起的误报。 通过研究与分层的超声波相互作用之间的物理关系理论上开发了ZLCC方法。 然后,使用2D有限元模型进行数值验证。 有限元分析结果表明,内部分层是成功定位和ZLCC突出的。

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