| Research and application of satellite antenna technology is one of the key points in the development of space technology.The large satellite antenna structure is limited by the launching volume.So the deployable satellite antenna structure has become a research hotspot.The research on folding mechanical properties of the antenna is the key to ensure folding,receiving and successful deployment of the folding satellite antenna.At the same time,the structure of satellite antenna as the platform of antenna work,its dynamic performance directly affects the stability and accuracy of antenna work.Therefore,the analysis of dynamic characteristics of antenna structure has important theoretical significance and engineering application value.In this paper,a thin-walled flexible structure made of carbon fiber composite material is studied,and its flexural and dynamic properties are analyzed.The main research contents are as follows:(1)Based on the theory of mechanics of composite materials,the flexural properties of tape spring are analyzed and studied respectively by finite element simulation software ABAQUS and experimental method.On this basis,the dynamic characteristics of single thin-walled hinge,multi-thin-walled hinge and antenna frame in the process of folding are studied respectively.The relationship between stress,bending moment and bending angle during folding and the variation of vibration frequency during unfolding are analyzed.(2)The modal analysis of the antenna is carried out by finite element method and modal experiments?The natural frequencies of the antenna frame and the whole antenna are 7.9 HZ and 5.5 HZ,respectively.The mode shapes of the antenna frame are longitudinal first-order bending.The natural frequencies and mode shapes of antenna structures with or without preload and different preload are analyzed.The influence of antenna array thickness on antenna natural frequency is also researched.(3)The slot size of the thin-walled hinge on the antenna frame is taken as the optimization variable,and the reduction of maximum stress and increase of natural frequency during folding are taken as the optimization objective,and based on the radial basis function neural network proxy model,the optimal design of the antenna structure is completed through the joint simulation optimization platform of ABAQUS and ISIGHT.The maximum stress is reduced by 16.6%,the first natural frequency is increased by 13.9%,and the dynamic performance of the satellite antenna is greatly improved. |
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