Research On Static And Dynamic Characteristics Of The Variable Wing Based On The Optical Fiber Sensing System

With the rapid development of aerospace technology, the variant wing has become a hotspot ,because of its good aerodynamic performance. In flight process, we need to know the structure stress and health condition of its typical locations, so carrying on the strain field, temperature field monitoring is of great significance.Optical fiber Bragg grating (FBG) not only has light quality. corrosion resistance, strong anti-electromagnetism interference, a unique advantage of sensing integration, and safe and reliable in operation, but also has other unique advantages: Smaller sizes, higher sensitivity, easy to couple with optical fiber, lower loss, sensing and transmission integration, easy to use WDM, be available to decorate many sensing points in one fiber, composing distributed sensing system and so on. This paper adopts distributed optical fiber Bragg grating sensor to monitor the strain field and temperature field of variant wing trailing edge model simultaneously, then obtains related data, and provides beneficial references for static and dynamic studies and health monitoring of the variant wing structures based on the optical fiber sensing system. .This paper first outlines development survey of the variant wing, then analyzes the advantage of stress and temperature field monitoring by use of fiber Bragg grating sensor, and then introduce the basic structure of FBG, working principle of temperature sensibilization, and the performance characteristics of strain and temperature field monitoring simultaneously. Secondly by the use of the finite element analysis software MSC.Patran/Nastran, we build and analyze a model of the variants wing trailing edge, and get structure stress contour and deformation pattern, then we study network structure arrangement forms based on variant wing edge fiber Bragg grating. Finally we use the distributed optical fiber Bragg grating sensor network to test the static and dynamic mechanical properties of variant wing trailing edge model, and compare the test results with finite element analysis results.In the process of dynamic analysis ,we study and test dynamic characteristics of variant wing. By experiment we obtain the inherent frequency of variable wing section, and compare it with theory modal analysis results, and the results indicate that it has good consistency. By this research, we master static and dynamic characteristics of the variable wing. The paper uses the finite element technique to carry on some beneficial attempt, and has certain sense in academic and practical engineering application.