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Structural Health Monitoring system based on a concept of Lamb wave focusing by the piezoelectric array

机译：基于Lamb波聚焦的压电阵列结构健康监测系统

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摘要

Piezoelectric transducer arrays are utilized in Structural Health Monitoring systems as a means for excitation and sensing of elastic waves. Anomalies of propagating waves have enabled to develop damage detection algorithms. Depending on actuation-sensing strategies these algorithms can be classified as pitch-catch and pulse-echo. Despite many signal processing methods such as delay-sum, time-reversal, probability-based diagnostic imaging, etc. the spatial damage information provided by the actuator-sensor paths to reconstruct the damage image is limited. A novel strategy based on Lamb wave focusing is proposed in order to increase damage imaging resolution. In the proposed method all actuators are used at the same time exciting specially designed waveforms so that inspect one specific point of the structure. Damage map is created by applying appropriate signal processing. It uses dispersion curve of selected Lamb wave mode for dispersion compensation. The dispersion curve is acquired by using laser scanning Doppler vibrometer. The damage indicator is calculated based on the energy of compensated signals registered by sensors. It is shown that apart from high energy level at excitation point, energy is concentrated exactly in the damaged region. An example of crack detection and visualization in an aluminum plate is shown confirming the accuracy of the proposed method. Also the proposed method is compared to well-established delay-and-sum algorithm.
机译：压电换能器阵列在结构健康监测系统中用作激发和感测弹性波的手段。传播波的异常使得能够开发损伤检测算法。根据致动传感策略，这些算法可分为音高捕获和脉冲回波。尽管有许多信号处理方法，例如延迟和，时间反转，基于概率的诊断成像等，但执行器-传感器路径提供的用于重建损伤图像的空间损伤信息仍然受到限制。为了提高损伤成像的分辨率，提出了一种基于兰姆波聚焦的新策略。在提出的方法中，同时使用所有执行器来激发专门设计的波形，以便检查结构的一个特定点。通过应用适当的信号处理来创建损坏图。它使用所选兰姆波模式的色散曲线进行色散补偿。通过使用激光扫描多普勒振动计获得色散曲线。损坏指标是根据传感器记录的补偿信号的能量计算得出的。结果表明，除了激发点处的高能级外，能量正好集中在受损区域。显示了铝板上裂纹检测和可视化的示例，证实了所提出方法的准确性。还将所提出的方法与完善的延迟和算法进行比较。

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