| Space antenna is applied widely in many domain, such as moving communication, earth observation and space exploration. The develop of space antenna is concerned prodigiously. The connatural characteristic and quality are most important. They should be considered during the structure design of space deployable antenna. The connatural characteristic of space deployable antenna influences the stability during using of antenna. The quality of space deployable antenna influences the producing cost and launching cost. So it is important to optimize the structure of space antenna.The thesis firstly depicts the components of the space antenna, also devising antenna's deployable machine and the antenna's reflection paraboloid. Then, in ANSYS software, the finite element analysis models of the space deployable antenna is established in working state. At time, the natural frequencies and model shape of five structures is analyzed. The best framework is selected. Secondly, using ANSYS software , the thesis reckons the influencing degree of parameters for antenna's natural frequencies and antenna's quality. There are three parameters influence the quality and the connatural frequency largely, so they are acted as variables to set up the model of multiobjective optimization. The aims maximize the first natural frequency and minimize the mass. Finally, the optimization program is programmed in MATLAB software, the program consists of immune algorithm and neural network. Combining orthogonal experiment and unification object method, the best design variables is obtained.Through analyzing the connatural characteristic of antenna, the factors are found that affect the natural frequency of antenna. It will provide the reference for the structure designing of antenna. The reasonable antenna structure is acquired by programming optimization program. It solve a complicated structure design optimization problem with lots of finite element computation, multiple targets and multiple dispersed variants. |
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