Structure Design And Analysis Of A Large Deployable Vehicle-borne Antenna

Vehicle-borne radarwithits highmobility,high concealment,the deployment of a wide range of features,has been widely applied in the modern war.However,due to the limited loading space and the limited load capacity of the vehicle borne radar,the antenna array needs to be folded and loaded,so the deployment of the antenna array becomes an important part of the vehicle borne radar.Generally,the larger the antenna array size is,the longer the deployment time will take place,which seriously affects the erection speed of the vehicle borne radar.In order to improve the maneuverability of large size vehicle borne radar,it is necessary to study the deployable mechanism and improve the efficiency of erection.This paper describes the design of a new type of vehicle-borne radar accordion mechanism,the mechanism can be folded antenna 18 meters wide 2.5 meters,and was able to complete the antenna installa tion,in a short period of time.Combining with the design index of a vehicle borne radar,this paper presents the overall design of the deployment system,and gives the radar erection scheme.At the same time,the key structure of the deployment system is analyzed and designed in detail.The kinematics and dynamics of the vertical structure are analyzed in detail.The accuracy of radar surface is quantized and the mathematical model of surface accuracy is established.Through the optimization of constraint analysis and optimization space,the transverse spacing and pre deformation as independent variables,the surface precision for the surface precision optimization model,establishes the optimization flow chart based on ANSYS optimization module,and calculates the optimal design variables.Aiming at the antenna array structure designed in this paper,the optimization and analysis of the array accuracy are carried out.Firstly,the definition and influence factors of radar surface accuracy are defined,and the evaluation indexes are established,and the surface accuracy mathematical model is established.By analyzing the constraints and the optimized space,an optimization model of the surface accuracy is proposed with the distance between the beam and the pre deformation as the independent variable and the surface accuracy as the optimization objective.According to the design of the expansion and erecting mechanism,the prototype is developed.The feasibility of the deployable mechanism is verified by the expansion and contraction experiments of the prototype.Measure the stress of key components and verify the reliability of the skeleton structure.The surface accuracy of the prototype is measured by the electronic total station,which indicates that the theoretical optimization design is consistent with the actual result.This paper mainly covers the system design of a new type of radar accordion,including the overall design,detailed design,analysis of key mechanism,kinematics and dynamics of system optimization and simulation accuracy of vertical array,and making a prototype for functional test.It provides a reference for the design of high mobility large size vehicle borne radar,and is of great significance to the development of military vehicle borne radar in our country.