索-梁-膜张拉式天线展开机构非线性动力学特性及参数优化分析

The tension structure combined by cable, beam and membrane element, with the characterized of high folding ratio, light weight, rigid-flexible coupling, is one of the development directions of space deployable antenna. To study the nonlinear dynamic characteristics of the cable-beam-membrane complex flexible structure, consider the influence of the pretension, a new type of cable-beam-membrane tension antenna is analyzed for its nonlinear dynamic characteristics and optimized for its structural parameters. Firstly, based on the nonlinear dynamics theory, the nonlinear dynamics model of antenna deployable structure under the influence of pretension is established by adopting the temperature-structure pretension import method. On this basis, the nonlinear influence of pretension, material parameters and structural geometric parameters on the dynamic characteristics of the antenna deployable structure are analyzed. Results show that, the antenna nature frequency increases with the increase of the pretension, the diameter of the cable, and the beam cross-sectional area, and decreases with the increase of the membrane thickness. Finally, according to the sensitivity analysis results, based on the multi objective genetic algorithm, the antenna structure parameter optimization scheme is obtained. This result provides a theoretical and engineering application basis for the development of antenna prototype.