Structural Health Monitoring of a UAV Fleet Using Fiber Optic Distributed Strain Sensing
Structural Health Monitoring of a UAV Fleet Using Fiber Optic Distributed Strain Sensing
复制标题
使用光纤分布式应变传感对无人机机队进行结构健康监测
DOI：
10.12783/shm2015/371
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Tur
中科院分区：
文献类型：
--
作者：
O. Shapira;U. Ben;A. Bergman;S. Shoham;B. Glam;I. Kressel;T. Yehoshua;M. Tur
本文介绍了分布式光纤应变传感作为一种标准程序的应用，以评估整个服役的高空长航时无人机(UAV)机队的适航性。基于瑞利后向散射的传感概念被应用于嵌入机翼主梁全长的标准光纤。每架无人机在服役期间定期收集单独的负重应变特征(空间分辨率为1厘米)，并与基线进行比较。到目前为止，在规定的加载协议下获得了良好的应变特征重复性，证明了机翼的概念稳健性以及良好的结构性能。同时使用分布式瑞利背向散射传感器和更传统的光纤Bragg光栅点传感器的应变读数进行了比较，以进行验证，显示出极好的一致性。此外，同样的传感概念被应用于全尺寸测试件，以监测其在疲劳测试期间的结构性能，模拟该无人机的几个寿命。将主成分分析(PCA)应用于收集的数据，以便分离出与机翼结构健康变化更有可能相关的信息。在这一适航监测政策下，无人机机队完成了许多飞行小时，没有误报警或传感光纤任何损坏。DOI：10.12783/SHM2015/371.
This paper presents the application of distributed fiber optic strain sensing as a standard procedure for airworthiness assessment of an entire fleet of operational High Altitude Long Endurance (HALE) Unmanned Aerial Vehicles (UAVs) during service. The Rayleigh-backscattering-based sensing concept is applied to a standard optical fiber, which is embedded within the full length of the wing main spar. Individual under-load strain signatures (with a spatial resolution of 1cm) are periodically collected during service for each UAV and compared to a baseline. Excellent repeatability of the strain signatures under a prescribed loading protocol has been obtained so far, demonstrating the concept robustness, as well as the excellent structural performance of the wing. Simultaneous strain readings, using both distributed Rayleigh backscattering and the more conventional fiber-optic Bragg grating point sensors, imprinted on the same fiber, were compared for validation, showing excellent agreement. In addition, the same sensing concept was applied to a full-scale test article to monitor its structural performance during a fatigue test, simulating several life times of this UAV. Principal Component Analysis (PCA) was applied to the collected data in order to isolate the information which is more likely associated with changes in the structural health of the wing. The UAV fleet accomplished many flight hours under this airworthy monitoring policy with no false alarms or any damage to the sensing optical fibers. doi: 10.12783/SHM2015/371