Research On The Strain Of Morphing Wings’ Structure Based On Distributed Fiber Monitoring Technology And FBG Sensors’ Optimization Configuration

Fiber optic sensors have the properties of light weight, small diameter, flexible,corrosion-resistant, and can achieve the displacement, stress, temperature and other70kinds ofphysical testing to meet the technical requirements of high-precision, remote, distributed andlong-term, making it ideal for large and complex aerospace structures to achieve the health status ofthe intelligent monitoring. Optical fiber sensors are recognized as the most suitable sensors type toform the distributed monitoring network in Smart Materials and Structures.In different flight posture and flight conditions, intellectual structure and actuator of morphingwings proceed dynamic deformation according to external condition and control instruction.It showsgood aerodynamic property. Due to stress filed， distribution of temperature filed andcomplicated.function form of wing body structure, it is very important to obtain structural message forevaluateing stuctrual health state. Therefore We need accurately obtain effective information of thestrain distribution of wing body structure.Because the structure shape, materials and load-bearing form of aviation key components isdifferent, make their strain field distribution characteristics is also different,. it is necessary to studythe optical fiber FBG sensor optimization allocation methods, including sensor quantity optimizationand sensor positions optimization. For different structures and properties of materials, the study ofoptimal sensor configuration has important meanings in improving the efficiency, reliability andeconomy of the system.This paper studys the strain field distribution of variations wing in the muti-physics coupling andoptimization of fiber Bragg sensors.The main jobs are as follows:Firstly, this paper describes the background, the technology variable wing body, structural healthmonitoring of aerospace technology based on fiber-optic sensor network and optimization of fiberBragg grating sensor configuration and other areas of research are descrirbed in detail from the statusand meanings of domestic and foreign.Secondly, variable wing structure strain field numerical simulation under the conditions of amulti-physics coupling and the strain monitoring of the critical parts based on fiber Bragg grating arestudied respectively. Using COMSOL Multiphysics coupled multi-physics finite element analysissoftware to make strain field numerical analysis of the model. By building a distributed fiber Bragggrating sensor network, we can achieve effectively monitoring of the key parts of the structure and changes in strain distribution.Thirdly, FBG sensor optimization method based on rule of the maximum coverage is studied. Itproposes the sensor optimization model and configuration guidelines based on optimal coverage. Onthis basis, we respectively use different intelligent algorithms (including particle swarm optimization(PSO), genetic algorithms, Multi-particle PSO, Virtual Material Force-directed Particle SwarmOptimization) to make the numerical simulation and evaluation of the effects of the sensor optimalallocation.Finally, we carry out the validation study of FBG sensor optimization allocation. According tothe numerical simulation of the previous section, by building a distributed fiber-optic FBG strainmonitoring system, we respectively choose the monitoring regional based on flat square structure andround and carry out the validation experiments of the sensor optimizing.