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对于跨频率的高损伤灵敏度,使用Lamb波浪时间逆转方法进行多模式分散补偿

Souvik Jana¹, Santosh Kapuria¹

¹Department of Applied Mechanics, Indian Institute of Technology Delhi, New Delhi 110016, India.

|August 23, 2025

概括

这项研究引入了分散补偿时间逆转方法 (TRM) 用于Lamb波结构健康监测. 这种新方法显著提高了损坏检测的灵敏度和准确性,克服了传统TRM的关键局限性.

科学领域:

结构健康监测
非破坏性测试
波的传播

背景情况:

传统的时间逆转方法 (TRM) 用于基于Lamb波的损伤检测有扩散幅度.
在未受损的结构中,幅度分散阻止了零损伤指数 (DI),并使值设置复杂化.
随着激发频率的变化,DI会降低损伤检测的灵敏度和一致性.

研究的目的:

提出一种新的技术,在时间逆转后消除重建信号中的振幅分散.
实现接近零的损坏指数 (DI) 门,以改善损坏检测.
提高基于Lamb波的结构健康监测的灵敏度和可靠性.

主要方法:

通过将重建的信号的传输函数除以健康路径的主模式传输函数 (MTF) 来开发分散补偿技术.
在宽带激发下直接从前向响应中确定MTF,独立于传感路径长度.
扩展信号长度用于DI计算,以捕获损坏引起的额外模式,提高灵敏度.

主要成果:

在重建信号的主模式中成功消除了振幅分散.
对于未受损的结构, 达到了接近零的DI值,
在传感路径内外对各种损伤类型 (口,块质量) 的损伤检测灵敏度和尺寸显著提高.

结论:

拟议的分散补偿TRM有效地克服了传统TRM的振幅分散限制.
该方法为结构健康监测应用提供了更高的灵敏度和可靠性.
该技术与传感路径长度的独立性使其能够在复杂的网络中进行损害定位.

关键词:

分散补偿扩展波包羊羔的波浪多模式分散结构性健康监测时间逆转方法

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