Design and Analysis of Membrane Structure for Special-shaped Sunshield Based on Accordion Origami

In order to meet the development needs of large-scale, lightweight and high storage rate of space optical system sunshield structure, a large-scale special-shaped deployable sunshield structure is proposed. Firstly, according to the shading requirements of the optical system, the overall design scheme of the deployable sunshield structure is studied. Secondly, based on the Accordion origami principle, the folding scheme design of the membrane structure of sunshield is carried out, and a parametric mathematical model of irregular polygonal columnar folding structure is established. Thirdly, the ABAQUS simulation software is used to establish the simulation model of the membrane structure deployable process, and the variation law of the stress during the deployable process is analyzed. Finally, a scale-down prototype is developed, and the deployment function test is carried out. The simulation and experimental results show that the designed sunshield structure can complete the deployment action successfully, the membrane has no interference with the deployable support mechanism, and there is no jam in the deployable process, and the membrane does not tear. The research results can provide certain reference for the structural design and research of other spacecraft sunshield.