Research On Shape Sensing Technology Of Structure By FBG

UAVs are playing a more and more important role in the military and civil fields thanks to their advantages of small size,strong concealment,low cost,ease of use,high survival rate and strong environmental adaptability.While UAVs usually have a large aspect ratio,and the wings can easily deform during flight,threatening the flight safety of the UAV.Real-time monitoring is of great significance to its flight safety and the development of advanced deformable UAV.The purpose of this paper is to study a FBG-based deformation monitoring system that can monitor the wing deformation of a UAV in real time and with high accuracy.The main research is as follows:(1)Based on the orthogonal curvature and the three-dimensional reconstruction algorithm based on the Frenet equation,an improved reconstruction algorithm based on three FBG is designed and the effectiveness of the algorithm is simulated by Matlab platform.The results show that this algorithm has high detection accuracy and real-time performance and better temperature compensation ability.(2)Visualization is an important indicator of UAV wing deformation monitoring system.Based on Java3 D technology and multi-threading technology,this project constructs a deformation and reconstruction visualization module.The shape of the spar and skin is displayed on the computer screen in real time and the imaging speed of up to 50 frames / second.(3)Aiming at the spar structure of the UAV wing,a shape sensor based on FBG is designed,which has the advantages of small volume,high flexibility and strong reusability.This sensor is laid in the inner cavity of the spar model,and the spar deformation monitoring system based on FBG is built combined with the Java-based software platform.The experimental results show that the system has high monitoring accuracy and can show the deformation of the spar in real time.(4)Aiming at the skin structure of the UAV wing,a sensor network based in FBG is designed.SMA is taken as the base and the hardware platform of the skin deformation monitoring is constructed.The skin of the wing model is reconstructed based on the surface reconstruction algorithm and through the laser tracker at the same time.The two shapes are compared and the result indicates that the method has high reconstruction accuracy and is effective.