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Development of Strain Measurement based On-line Impact Monitoring System for Composite Structures.

机译：基于应变测量的复合结构在线冲击监测系统的开发。

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The high specific strength and tailorable properties have made advanced composites structures to find increased use in the aircraft industry. Impact damages due to events such as tool drops,runway debris etc. can reduce the load carrying capacity of composite structures and impair safe operation of the aircraft. Often they result in barely visible external damage and as such they may get missed during visual inspection of large aircraftstructures. Impact events are random in nature, in both time domain (uncertain when it will occur) and spatial domain (where it will occur), hence, the challenge is to develop a smart impact monitoring system, which will remain active to report the impact event on the structure. This paper describes the experimental studies carried out towards the development of an online impact monitoring system, which can estimate the impact location and severity of impact in terms of impact energy/force. Such a system can assist m carrying out inspection only in the identified locations instead of inspecting the whole structure. An impact test setup developed in-house is used to carry out impact tests on composite structures. The portable impact tower comprises of a drop weight and a tup instrumented with a force sensor to measure the force response during impact. Sensor sensitivity studies are carried out to determine the optimum sensor locations on the structure. Fiber , Bragg Grating (FBG) and Resistance Strain Gauges (RSG) sensors are used in this study to measure strains in the structure during impact. A comprehensive method based on a building block approach is followed. Several laminates of different thicknesses are tested first before moving on to more complex configurations such as skin-stringer panels and wing-box like structures. These studies allow us to understand the complexities in the structural response towards impact and help in design of sensor networks as well as algorithms for estimation of impact location and severity. In order to determine the impact location using strain data acquired during the impact event, various algorithms are developed, validated and implemented in Lab VIEW platform. Support vector regression and system identification techniques based algorithms are used to determine the impact seventy. Comparative results of the algorithms will also be discussed through Probability of Detection/Confidence.
机译：高比强度和可定制的性能已使先进的复合材料结构在飞机工业中得到越来越多的使用。由于诸如工具掉落，跑道碎屑等事件造成的冲击损坏会降低复合结构的承载能力，并损害飞机的安全运行。通常，它们几乎看不到外部损坏，因此在大型飞机结构的目视检查中可能会被遗漏。影响事件本质上是随机的，在时域（不确定何时发生）和空间域（何时发生）方面，因此，挑战在于开发一个智能的影响监测系统，该系统将保持活跃状态​​以报告影响事件在结构上。本文介绍了为开发在线撞击监控系统而进行的实验研究，该系统可以根据撞击的能量/力来估算撞击的位置和撞击的严重性。这样的系统可以帮助仅在所识别的位置执行检查，而不是检查整个结构。内部开发的冲击测试装置用于对复合结构进行冲击测试。便携式冲击塔包括一个落锤和一个装有力传感器以测量冲击过程中力响应的帐篷。进行传感器灵敏度研究，以确定结构上的最佳传感器位置。在这项研究中，使用光纤，布拉格光栅（FBG）和电阻应变仪（RSG）传感器来测量冲击过程中结构的应变。遵循基于构件方法的综合方法。首先要测试几种不同厚度的层压板，然后再进行更复杂的配置，例如纵梁面板和类似机翼盒的结构。这些研究使我们能够理解对撞击的结构响应的复杂性，并有助于设计传感器网络以及估算撞击位置和严重程度的算法。为了使用在冲击事件期间获取的应变数据确定冲击位置，在Lab VIEW平台中开发，验证和实现了各种算法。基于支持向量回归和系统识别技术的算法用于确定影响70。算法的比较结果也将通过“检测/置信概率”进行讨论。

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