Theoretical Model of Dynamic Characteristics of Spacecraft with Long-Span Branch
With the increasing demand of loads installed in the spacecraft,the loads are appeared as long-span or weakly connected;therefore there will be branch modes and higher requirements for control design.Based on the elastic boundary condition theory,the supplementary function of improved Fourier series is used to describe bending displacement,and the theoretical dynamic model of the main beam with the branch is established,considering the elastic connection between them.The theory in this paper effectively expands the mode prediction method of the spacecraft with branches.Compared with the finite element method,the frequency deviation of the first five modes is less than 2.5%.
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