Stringer debonding edge detection employing fiber optics by combined distributed strain profile and wave scattering approaches for non-model based SHM
Stringer debonding edge detection employing fiber optics by combined distributed strain profile and wave scattering approaches for non-model based SHM
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DOI：
10.1016/j.compstruct.2019.02.088
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发表时间：
2019-05-15
影响因子：
6.3
通讯作者：
Ricci, Fabrizio
中科院分区：
文献类型：
--
作者：
Ciminello, Monica;Boffa, Natalino Daniele;Ricci, Fabrizio
本文提出了两种新的损伤检测方法询问加筋复合材料进行了比较。基于压电贴片的导波评估方法与分布式光纤传感器相结合，提供了一种具有成本效益和节省时间的监测系统。由于这两种技术具有不同的采样范围，因此易于集成，不会产生任何干扰或串扰效应，并可用于提供冗余的检测系统。分布式光纤结构健康监测是一种基于非模型的损伤检测方法。考虑在不同时间戳处或在沿着光纤段的沿着不同位置处的形状轮廓之间的相对纵横比，并且在时域和空间域中应用一阶导数，使由高梯度事件表征的传感器值相关。这种分散图案的出现可以与由损伤引起的结构非线性相关联。为了使这种方法有效的PZT导波散射方法被用作参考。这两种系统进行了测试，以相同的特定目标，名义上是一个复合材料加筋板进行冲击。当比较两种方法的分辨率时，报告了良好的结果，实际上通过超声无损调查分析得到了验证。
The paper presents a comparison of two novel damage detection approaches for interrogating stiffened composites. A guided wave assessed methodology based on piezoelectric patches is integrated with a distributed fiber optic sensor providing a cost-effective and time-saving monitoring system. Being the two techniques characterized by different sample ranges, they are prone to be integrated without any interference or cross talk effect and can be applied to provide a redundant inspection system.The structural health monitoring by distributed fiber optic is a non-model based damage detection method. The relative aspect ratio between shape profile at different time stamps or at different locations along the fiber segments are taken into consideration and the first order derivative is applied, both in time and spatial domain, correlating sensors values characterized by high gradient events. The occurrences of a such dispersed pattern can be associated to a structural non-linearity induced by damage. In order to make this approach effective the PZT guided wave scattering methodology is used as reference. Both systems are tested to the same specific target, nominally a composite stiffened plate undergoing to impact. Good results are reported when comparing the resolutions of the two methodologies, indeed verified by ultrasonic nondestructive investigation analysis.