用于飞行器结构监控的柔性无线曲率传感器

Flexible Wireless Curvature Sensor for Aircraft Structure Monitoring

曲率传感器是提供高速飞行器机体结构曲率信息的关键器件,对构建关键部位载荷方程和提高局部载荷预测精度至关重要,在内部柔性部件主动控制及机体结构健康监测等方面展现出无可替代的作用。针对传统有线硬质器件难以适应柔性结构主动控制应用需求的“瓶颈”问题,结合新型二维材料及LC无线传感技术,本文提出了一种柔性无线曲率传感器,用以精确获取柔性结构主动控制信号的反馈信息。采用多孔疏松的氧化石墨烯作为LC谐振器的介质层以获得较高的曲率灵敏度,银质LC谐振器被丝网印刷于氧化石墨烯介质层表面,聚酰亚胺/聚二甲基硅氧烷层被用作柔性衬底。进行了表面形貌表征及性能测试,结果表明,曲率传感器实现了无源无线检测,灵敏度达到1.55MHz/mm,重复性误差小于0.54%,验证了利用新型二维材料研制无线曲率传感器的可行性,为提高高速飞行器内部柔性结构主动控制部件的精度和可靠性提供了研究基础。

Curvature sensor has a significant effect to provide structure curvature of aircraft.It is important to build the load equation of key parts and improve the accuracy of load prediction.Curvature sensor plays a considerable role to the active control of flexible structures and health monitoring of aircraft structures.Aiming at the bottleneck that traditional wired hard-substrate sensors are difficult to apply in the active control of flexible structures.This paper has combined two-dimensional material and LC wire-less sensing technology to propose a flexible wireless curvature sensor which could accurately obtain the feedback information of active control signals of flexible structures.Porous graphene oxide is employed as the dielectric layer of LC resonator to obtain high curvature sensitivity.Silver LC resonator is screen printed on the surface of graphene oxide dielectric layer,and polyimide(PI)/Polydimethylsiloxane(PDMS)layer is used as flexible substrate.Surface morphology characterization and performance test are carried out.The results show that the curvature sensor realizes passive wireless detection,the sensitivity reaches 1.55MHz/mm,and the repeatability error is less than 0.54%.It verifies the feasibility of developing wireless curvature sensor using innovative two-dimensional materials,which provides a research basis for improving the accuracy and reliability of active control components of flexible structures in high-speed aircraft.