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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Development and Experimental Validation of a Numerical Tool for Structural Health and Usage Monitoring Systems Based on Chirped Grating Sensors
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Development and Experimental Validation of a Numerical Tool for Structural Health and Usage Monitoring Systems Based on Chirped Grating Sensors

机译：基于Chi光栅传感器的结构健康与使用监测系统数值工具的开发与实验验证

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摘要

The interest of the aerospace industries in structural health and usage monitoring systems is continuously increasing. Among the techniques available in literature those based on Fibre Bragg Grating sensors are much promising thanks to their peculiarities. Different Chirped Bragg Grating sensor configurations have been investigated in this paper. Starting from a numerical model capable of simulating the spectral response of a grating subjected to a generic strain profile (direct problem), a new code has been developed, allowing strain reconstruction from the experimental validation of the program, carried out through different loading cases applied on a chirped grating. The wavelength of the reflection spectrum for a chirped FBG has a one-to-one correspondence to the position along the gauge section, thus allowing strain reconstruction over the entire sensor length. Tests conducted on chirped FBGs also evidenced their potential for SHM applications, if coupled with appropriate numerical strain reconstructions tools. Finally, a new class of sensors—Draw Tower Grating arrays—has been studied. These sensors are applicable to distributed sensing and load reconstruction over large structures, thanks to their greater length. Three configurations have been evaluated, having different spatial and spectral characteristics, in order to explore possible applications of such sensors to SHM systems.
机译：航空航天工业对结构健康和使用情况监视系统的兴趣正在不断提高。在文献中可用的技术中，基于光纤布拉格光栅传感器的技术由于其独特性而非常有前途。本文研究了不同的Chi布拉格光栅传感器配置。从能够模拟经受一般应变曲线（直接问题）的光栅的光谱响应的数值模型开始，已经开发了新的代码，该代码允许通过程序的实验验证重构应变，并通过应用不同的加载工况进行在a的光栅上。 chiFBG的反射光谱的波长与沿量规部分的位置一一对应，因此可以在整个传感器长度上重建应变。如果结合适当的数值应变重建工具，对chi形FBG进行的测试也证明了它们在SHM应用中的潜力。最后，研究了新型传感器-拉塔光栅阵列。这些传感器的长度较大，因此可用于大型结构的分布式传感和负载重建。为了探索这种传感器在SHM系统中的可能应用，已经评估了三种具有不同空间和光谱特性的配置。

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