结构裂纹损伤的Lamb波层析成像监测与评估研究
发布时间：2018-07-14 21:34
【摘要】：结构健康监测研究中,板壳类结构裂纹损伤监测一直是研究的热点。采用基于相关性分析的概率损伤重构算法(Reconstruction algorithm for probabilistic inspection of damage,RAPID),对结构裂纹损伤监测进行研究。利用RAPID算法中采用信号之间的差异性进行损伤识别和重构,克服了Lamb波复杂多模传播特性对信号分析的影响。在此基础上提出一种改进的RAPID算法,根据裂纹损伤对Lamb波监测信号的反射及散射作用,通过校正损伤区域中裂纹方向上的信号差异系数值(Signal difference coefficient,SDC),强化裂纹方向上的重构图像信息,实现对裂纹损伤的图像重构,并由接收端SDC分布图评估出裂纹的长度。试验结果表明,该方法能较为准确地实现对裂纹损伤的直观图示,重构出的裂纹层析图像能很好地反映裂纹的信息,实现方向及长度的评估,可用于对裂纹损伤的定量评估和扩展监测。
[Abstract]:In the study of structural health monitoring, crack damage monitoring of plate and shell structures has been a hot spot. Based on the correlation analysis, the probabilistic damage reconstruction algorithm based on correlation analysis is used to study the structural crack damage monitoring. The difference between signals is used to identify and reconstruct the damage in Rapid algorithm, which overcomes the influence of Lamb wave complex multimode propagation on signal analysis. On this basis, an improved Rapid algorithm is proposed. According to the effect of crack damage on the reflection and scattering of Lamb wave monitoring signal, By correcting the signal difference coefficient (SDC) in the crack direction, the reconstructed image information in the crack direction is strengthened to reconstruct the crack damage image, and the length of the crack is evaluated from the SDC distribution diagram of the receiving end. The experimental results show that this method can accurately realize the intuitive graph of crack damage, and the reconstructed crack tomography image can well reflect the information of the crack and realize the evaluation of the direction and length of the crack. It can be used to quantitatively evaluate and monitor crack damage.
【作者单位】： 南京邮电大学自动化学院;
【基金】：国家自然科学基金(11202107) 教育部高等学校博士学科点专项科研基金(20113223120008)资助项目
【分类号】：TP391.41
本文编号：2123021
[Abstract]:In the study of structural health monitoring, crack damage monitoring of plate and shell structures has been a hot spot. Based on the correlation analysis, the probabilistic damage reconstruction algorithm based on correlation analysis is used to study the structural crack damage monitoring. The difference between signals is used to identify and reconstruct the damage in Rapid algorithm, which overcomes the influence of Lamb wave complex multimode propagation on signal analysis. On this basis, an improved Rapid algorithm is proposed. According to the effect of crack damage on the reflection and scattering of Lamb wave monitoring signal, By correcting the signal difference coefficient (SDC) in the crack direction, the reconstructed image information in the crack direction is strengthened to reconstruct the crack damage image, and the length of the crack is evaluated from the SDC distribution diagram of the receiving end. The experimental results show that this method can accurately realize the intuitive graph of crack damage, and the reconstructed crack tomography image can well reflect the information of the crack and realize the evaluation of the direction and length of the crack. It can be used to quantitatively evaluate and monitor crack damage.
【作者单位】： 南京邮电大学自动化学院;
【基金】：国家自然科学基金(11202107) 教育部高等学校博士学科点专项科研基金(20113223120008)资助项目
【分类号】：TP391.41
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