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首页> 外文会议>3rd International Workshop on Structural Health Monitoring, Sep 12-14, 2001, Stanford University >Fiber Optic System for Measuring the Structural Behavior of Parachute Airdrop: Quasi-Static and Dynamic Testing
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Fiber Optic System for Measuring the Structural Behavior of Parachute Airdrop: Quasi-Static and Dynamic Testing

机译：测量降落伞空投结构行为的光纤系统：准静态和动态测试

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摘要

For optimal design of the personnel parachute, the ability to predict the opening forces during an airdrop is crucial. Solving this challenging technical problem will permit better design for both military and civilian parachutes in terms of structural parameters and selection of materials. As a cost-effective solution to the current practice of over designing parachutes, a novel methodology for real-time characterization of the structural behavior of parachutes during inflation is proposed. This method is based on using embedded fiber optic sensors for local stress/strain measurements. Two types of fiber optic sensors are used to sense static as well as dynamic loads in parachute canopy and suspension lines. An optical fiber Bragg grating (FBG) type sensor is used as a short strain gauge for measuring axial strain. The second type of fiber optic sensors is based on the Modal Power Distribution (MPD) Technique and is used for measuring axial as well as transverse strains. The integration of these two types forms a novel sensory system capable of measuring the dynamic structural behavior of a parachute during inflation. Several tests were conducted with quasi-static loading conditions to measure strains/stresses in the parachute canopy fabric, using a tensile test machine. Drop tests were also performed on the parachute canopy fabric using the MPD technique. Encouraging results were achieved. Several samples are presented in this paper.
机译：为了优化人员降落伞的设计，预测空投期间打开力的能力至关重要。解决这一具有挑战性的技术问题将使军用和民用降落伞在结构参数和材料选择方面都能进行更好的设计。作为当前过度设计降落伞的一种经济有效的解决方案，提出了一种新颖的方法来对充气期间降落伞的结构行为进行实时表征。该方法基于使用嵌入式光纤传感器进行局部应力/应变测量。两种类型的光纤传感器用于检测降落伞顶篷和悬挂线中的静态和动态负载。光纤布拉格光栅（FBG）型传感器用作测量轴向应变的短应变仪。第二种类型的光纤传感器基于模态功率分配（MPD）技术，用于测量轴向应变和横向应变。这两种类型的结合形成了一种新颖的感觉系统，该系统能够测量充气过程中降落伞的动态结构行为。使用拉力试验机在准静态载荷条件下进行了几次测试，以测量降落伞冠层织物中的应变/应力。还使用MPD技术对降落伞冠层织物进行了跌落测试。取得了令人鼓舞的结果。本文介绍了几个示例。

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