Deployment Dynamics And Experimental Study Of The Deployable Truss Antenna Of Satellite

With the advent of the great space age,the requirements of space antenna such as large aperture(high gain),high precision(high frequency band),light weight and high reception ratio are put forward.In order to meet the four requirements,the deployable truss antenna is an option,and the dynamic analysis of its deployable process is a highly nonlinear problem.This thesis takes this as the main direction and carries on the more in-depth research work.The main contents of this thesis are as follows:1.The working principle of developable truss antenna is studied,a detailed design for the developable mechanism,through the connection of components to establish a basic frame unit constraint equation,using MATLAB software to solve basic rib unit is driving the movement of the slider,and the basic frame unit of motion law of overall motion law and extend the antenna configurations.2.The mechanical model of cable net structure is established by catenary element,the force of cable net is analyzed in the process of antenna deployment,and the design scheme of slippable center brace is proposed to improve the force of cable net in the process of antenna deployment from the perspective of its own structure.The driving force of antenna deploitation under the influence of cable net structure is analyzed.Furthermore,natural coordinate method and absolute nodal coordinate method were used to establish a complete rigid-flexible coupling dynamic model of the antenna system,and the dynamic characteristics of the antenna under the action of driving force were analyzed.3.Participated in the development of the principle prototype of the 7.6m aperture deployable truss antenna with three modules,designed the deployable control mechanism of the antenna based on the deployable movement law of the antenna,designed the relevant deployable experiment for the dynamics problems involved in the deployable process,and analyzed the experimental data in detail.