Study On Deformation Reconstruction Method Of Large Radar Antenna Based On Strain Data

With the demand of national defense increasing nowadays,the performance of defensing weapons has become more and more important for national defense power.,The performance of Phased-array antenna(PAA),a kind of military equipment aiming at remote detection,is significant to the power of national air defense and anti-missile.Knowing that the performance of PAA is often influenced by the array deformation in application,it is necessary to figure out the deformation and make compensation on the radar signal in order to save its performance.Based on the background stated above,this paper has selected the array installation panel,which is one of the key components in PAA,as the research object and carried on a series of research of its deformation reconstruction method.First,this paper presents a brief introduction to the entire problem.By browsing the research actuality overseas and domestic,the key measurable index of the mechanical deformation of the antenna array has been figured out,and the inverse finite element method(iFEM)has been chose as the key algorithm.After analyzing the mechanical feature of the array installation panel,the classical Kirchhoff thin plate theory has been applied to the modeling of the problem.Then the 4 node rectangular plate bending element in FEM has been referred to the construction of the iFEM algorithm.By carrying on simulation of simple thin plate and stiffened plate,the performance and feasibility of the method has been verified preliminarily.In order to make further verification on the application performance of the method,an experimental device,which aims at the simple thin plate,has been presented to carry on experiment research.Based on the actual situation of the problem,Fiber-Bragg-Gate(FBG)has been selected as the strain sensor in this device,and the distribution profile of the FBG has been designed according to the iFEM algorithm stated previously.Moreover,the design of the device has also considered the basic mechanical theory the inverse finite element.Finally,the feasibility of reconstruction method and measurement system have been verified by the experiment results.At last,in order to solve the problem that the reconstruction performance decreased in experiment compared with that in simulation,this paper moreover presents the analysis on the source of error,and then proposed the calibration method of strain transmitting efficiency based on DMS-PSO algorithm.Through this method,the strain transmitting efficiency of each measuring point on thin plate has been calibrated,and the RMSE of the reconstruction results has been controlled lower than 15% of the maximum deformation,which means that the performance and the practicability of the deformation reconstruction method have been improved.