【作者】 张勇；

【导师】 王帮峰；

【作者基本信息】 南京航空航天大学 ， 测试计量技术及仪器， 2013， 硕士

【摘要】 本文以变体机翼飞行器为研究对象，以变体机翼飞行器结构健康监测的新需求为出发点，结合光纤布拉格光栅传感器、先进复合材料结构、结构健康监测原理展开研究，提出利用光纤布拉格光栅（Fiber Bragg Grating，FBG）传感器应变传感原理和非均匀反射谱变化特性进行损伤监测与主动变形监测的方法。主要研究内容如下：（1）光纤布拉格光栅非均匀反射谱重构算法研究方面：在经典龙格－库塔算法和传输矩阵算法的基础上，将梯度因子引入传输矩阵算法中，获得了一种迭代速率高且跟踪应变场变化更为精准的改进传输矩阵算法。验证试验表明：改进传输矩阵算法迭代速率（提高4倍以上）和重构准确性有了明显提高。（2）变体机翼柔性蒙皮损伤监测研究方面：研究了复合材料波纹形柔性蒙皮在拉伸载荷下铺层损伤失效过程；进行有限元分析，预测了铺层失效次序和临界失效载荷；利用改进传输矩阵算法对预测失效铺层的临界失效光谱进行重构；提出以光纤布拉格光栅传感器非均匀反射谱反射峰变化监测复合材料波纹形柔性蒙皮渐进损伤的方法。静态拉伸实验结果表明：有限元分析铺层失效次序、对应临界光谱均与实验研究结果基本一致，临界失效载荷最大误差为8.6%。研究了复合材料蒙皮－蜂窝芯结构拉伸载荷下的力学特性和失效过程；提出利用FBG传感器非均匀反射谱反射峰规律性变化模式监测复合材料蜂窝芯结构失效过程的方法。实验研究表明：复合材料蜂窝芯结构失效过程中存在着FBG反射谱规律性的变化，结合有限元分析和拉伸特性曲线，光谱变化规律可有效描述复合材料蜂窝芯结构失效过程。（3）复合材料柔性曲面变形监测与曲面重构研究方面：以FBG应变传感原理为基础，建立各传感器封装位置实时曲率变化与中心波长的对应关系；采用一种非视觉传感方法实时动态监测复合材料柔性蜂窝芯曲面结构的变形位置。验证试验表明：重构曲面与实验视觉记录结果吻合且监测系统响应迅速。本文在FBG非均匀反射谱重构算法改进，光谱分析应用方面的探索，将FBG非均匀反射谱特性变化与复合材料结构损伤建立对应关系，为FBG传感器在新型复合材料蒙皮结构损伤监测研究提供了参考依据和研究基础；通过FBG应变传感原理建立曲面曲率与传感器中心波长的函数关系，为柔性曲面变形监测提供新的思路同时拓宽FBG传感器的应用范围。更多还原

【Abstract】 In this paper, the morphing wing aircraft is focused which is the frontier subject for futureaircraft development, and its starting point is the new demands of morphing wing aircraft structurehealth monitoring, the research is a synthesis of fiber Bragg grating sensors, advanced compositestructures, structure health monitoring, methods about damage monitoring and active deformationmonitoring based on strain sensing principle and non-uniform changes in the reflection spectrumcharacteristics of FBG sensors is proposed.The main contents are as follows:the spectrum reconstruction algorithm of fiber Bragg grating sensor: By Analysis the existingfiber Bragg grating sensor spectrum reconstruction algorithm, innovatively import the gradientfactor to the transfer matrix method, then the improved transfer matrix method that with highlyiterative rate and more sensitively about the change of strain field can be obtained. Validation testsshows that the iterative rate and the exactitude of improved transfer matrix method has beensignificantly improved improved transfer matrix method,The damage monitoring of morphing wing skin: The failure process of composite corrugatedflexible skin under tensile load is studied, a prediction of failure sequence of ply and the criticalfailure load is given by finite element analysis, the critical failure spectrum of predicting failureply is reconstructed by improved transfer matrix method, proposed a method about utilize thevariation of FBG sensor non-uniform reflection spectrum to monitoring progressive damage ofcomposite corrugated flexible skin, static tensile test results shows that the critical failure load,corresponding critical spectrum were consistent with the experimental findings, the maximumerror of critical failure load is8.6%; accentuate the tensile properties and failure behavior ofcomposites honeycomb core structure, Proposed the use of regularly change mode of FBG sensorreflection spectrum to monitoring composites honeycomb core structure failure process, by theexperimental study of different dimension cell unit composites honeycomb core study, obtainedthe relationship among the honeycomb failure process and the variation of FBG reflectionspectrum, then could integrated finite element analysis and each experimental results verify thefeasibility of this method.Composite flexible surface deformation monitoring and surface reconstruction: Based on thestrain sensing principle of FBG sensors, the sensing principle could establish the correspondenceamong the real-time curvature changes where the sensor is located and the center wavelength, then the surface curves can derive by the curve reconstruction algorithm. Validation experiments showthat the reconstructed surface and the visual record results are consistent, additionally, the systemowned a high response speed.The seeking of non-uniform FBG reflection spectrum reconstruction algorithm improvementsand spectroscopy applications has matched the non-uniform FBG reflection spectrumcharacteristics change with composite material structural damage, which provide research baseand reference of the study of new composite skin damage monitoring; Establish a functionalrelationship among surface curvature and center wavelength, to provide new ideas for the flexiblesurface deformation monitoring at the same time broaden the applications scope of FBG sensors.更多还原