Mechanism Design And Analysis Of Large-scale Membrane Solar Cell Array

As the main energy supply device of spacecraft,solar array mechanism,an indispensable part of spacecraft,provides power source for spacecraft.With the development of deep space exploration mission in China,the deep space exploration mission relies more and more on solar array and the demand for power supply increases gradually.It is urgent to develop an energy supply system that can provide enough power to drive.Therefore,it will be of great significance for the development of national aerospace industry in the future to carry out the research on solar array mechanism with large area,light weight and large ratio of fold to unfold.In this paper,based on the existing research results in our country,a kind of large-area,large ratio of fold to unfold membrane solar cell array mechanism is designed.First of all,based on the current research status at home and abroad,this paper proposes a variety of shapes of solar cell array mechanism,designs its deployment mode,evaluates each scheme in many aspects,obtains the most appropriate mechanism design scheme,and carries out the preliminary configuration design of the deployment mechanism.Secondly,the elastic bar of the main expansion member of the mechanism is analyzed,and the rigidity theoretical model of the elastic rod with different cross-sections is established.Through comparison and analysis,the appropriate elastic bar is selected.According to the material characteristics of the elastic bar,the equivalent elastic modulus of the elastic bar is calculated and verified by simulation.The influence of the material laying mode and the dimension parameters of the elastic bar on the rigidity of the elastic bar is analyzed.Then,the dynamic equilibrium equation and geometric equilibrium equation of the membrane are obtained by using the theory of thin shells,and the properties of the membrane in the moment without state are analyzed.The ABAQUS software is used to analyze the dynamics of the membrane under different external conditions.By analyzing the vibration modes of the membrane under different cable connection conditions and comparing them,the optimal membrane cable scheme is obtained.The parameters of the membrane and the cable under the scheme are optimized,and the dynamic analysis of the membrane of the connecting cable is carried out according to the optimized parameters.Finally,the detailed structure design of the deployment mechanism of solar cell array is carried out,and the dimension parameters of the core components are determined.Based on the overall analysis of the solar cell array deployment mechanism,three schemes of adding cables are proposed to increase the overall stiffness of the solar cell array deployment mechanism.The geometric parameters and axial stiffness ender each scheme are calculated respectively,and the finite element simulation analysis is carried out to determine the final scheme of adding cables.