Dynamic Study Of The Deployable Progress Of Satellite Antenna Based On The Absolute Nodal Coordinate Formulation

Whether the satellite antenna on orbit will work as expected directly relacted to the success of space mission.Therefore,to analyze the deployable process dynamic characteristics of the whole system composed of cable-driven,mesh system and the hoop truss,must set up with the satellite antenna model made up of cable-driven and mesh system.In addition,the dynamic analysis is carried out.This thesis studies the issue.In this thesis,the spatial beam element based on absolute node coordinate method is used to model satellite antenna,and the cable based on variable length finite element is used to model the cable-driven and mesh system,and contuct the numerical simulation by programming with MATLAB.The analysis of this thesis is summarized as follows:Firstly,based on the absolute node coordinate method,the process of establishing the three-dimensional beam element is studied.The finite element method is used to mode the entire process of the satellite antenna from the initial state to the working state.Adding the constraint to the model and solve it.In order to obtain the optimal expansion effect,this chapter uses multiple functions to drive the angular velocity,and compares the various resultes obtained by the angular velocity driven by different functions.The results show that the whole process of the antenna is stable and the driving force is not mutated when the angular velocity is five times.Secondly,a dynamic model of the flexible cable-driven based on the variable length finite element is built,and assemble it to obtain the model of the flexible cable system.This model is added to the model built in the second chapter,and the MATLAB is used to simulate the combined model Comparing the analysis results of each node information with driving is a three-dimensional beam element modeling results,the corresponding results show that the flexible cable-driven results more in line with the actual situation.Finally,the mesh system of satellite antenna is introduced,and the dynamic equation of mesh system is established by using finite element method.The mesh is the key part of the satellite antennam it affects the dynamic characteristics of the antenna and whether the antenna can work properly,the influence of the mesh on the whole structure needs to be taken into account.Therefore,mesh system is added to flexible combined model built in the third chapter,and analyze the entire process of the satellite antenna from the initial state to the working state.Node speed in different time and the change of all kinds of cable tension are obtained.At the end of the thesis,the content of this thesis is summarized and prospected.