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首页> 外文会议>Practical knowledge, worldly wisdom amp; extraordinary ingenuity >Development of Meandering Winding Magnetometer Eddy Current Sensors for the Health Monitoring, Modeling and Damage Detection of Composite Overwrapped Pressure Vessels (COPVs)
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Development of Meandering Winding Magnetometer Eddy Current Sensors for the Health Monitoring, Modeling and Damage Detection of Composite Overwrapped Pressure Vessels (COPVs)

机译：用于复合式包裹压力容器（COPV）健康监测，建模和损伤检测的曲折式绕线磁强计涡流传感器的开发

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Composite overwrapped pressure vessels (COPVs) are used in essentially all NASA spacecraft, launch vehicles and payloads to contain high-pressure fluids for propulsion, life support systems and science experiments. Failure of any COPV either in flight or during ground processing would result in catastrophic damage to the spacecraft or pay load, and could lead to loss of life. Therefore, NASA continues to investigate new methods to non-destructively inspect (NDE) COPVs for structural anomalies and to provide a means for in-situ structural health monitoring (SHM) during operational service.Partnering with JENTEK Sensors, engineers at NASA, Kennedy Space Center have successfully conducted a proof-of-concept study to develop meandering winding magnetometer (MWM) eddy current sensors designed to make direct measurements of the stresses of the internal layers of a carbon fiber composite wrapped COPV. During this study three different MWM sensors were tested at three orientations to demonstrate the ability of the technology to measure stresses at various fiber orientations and depths. These results showed good correlation with actual surface strain gage measurements.MWM-array technology for scanning COPVs can reliably be used to image and detect mechanical damage. To validate this conclusion, several COPVs were scanned to obtain a baseline, and then each COPV was impacted at varying energy levels and then rescanned. The baseline subtracted images were used to demonstrate damage detection. These scans were performed with two different MWM-Arrays with different geometries for near-surface and deeper penetration imaging at multiple frequencies and in multiple orientations of the linear MWM drive.This presentation will include a review of micromechanical models that relate measured sensor responses to composite material constituent properties, validated by the proof of concept study, as the basis for SHM and NDE data analysis as well as potential improvements including design changes to miniaturize and make the sensors durable in the vacuum of space.
机译：基本上所有的NASA航天器，运载火箭和有效载荷都使用复合包裹压力容器（COPV），以容纳用于推进，生命支持系统和科学实验的高压流体。在飞行中或在地面处理过程中任何COPV的故障都会对航天器或有效载荷造成灾难性损害，并可能导致生命损失。因此，NASA继续研究新的方法来对结构异常进行无损检查（NDE）COPV，并为运营服务期间的现场结构健康监测（SHM）提供一种手段。该中心已成功进行了概念验证研究，以开发曲折式绕线磁力计（MWM）涡流传感器，该传感器旨在直接测量碳纤维复合材料包裹的COPV内层的应力。在这项研究中，对三个不同的MWM传感器在三个方向上进行了测试，以证明该技术能够测量各种纤维方向和深度上的应力。这些结果表明与实际的表面应变计测量具有良好的相关性。用于扫描COPV的MWM阵列技术可以可靠地用于成像和检测机械损伤。为了验证此结论，先扫描了几个COPV以获得基线，然后以不同的能量水平影响每个COPV，然后重新扫描。减去基线的图像用于证明损坏的检测。这些扫描是使用两种不同的MWM阵列进行的，这些阵列具有不同的几何形状，以便在线性MWM驱动器的多个频率和多个方向上以近频率和更深层的穿透力成像。本演示将包括将测量的传感器响应与复合材料相关联的微机械模型的综述。材料成分特性，通过概念验证研究得到验证，可作为SHM和NDE数据分析的基础，以及潜在的改进，包括更改设计以最小化并使传感器在空间真空中耐用的设计。

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