Numerical simulation is carried out for the modes and dynamic responses of CE-1 directional antenna with finite element analysis (FEA) softwares MSC. NASTRAN. A spring element is introduced to modeling the torsional stiffness of motors according to the characteristic of double axis driving mechanism. Both of the modes and dynamic responses of key points in antenna are calculated with the FEA software. It is found that the torsional stiffness of motors has close relation with the modes of antenna while in working status, and the critical value of torsional stiffness of motor is acquired according to the system requirements. The computational results of the modes and acceleration responses of key points of antenna are compared with the experimental results. The compared results show that the former is consistent with the latter. The finite element model is correct and effective;the relation between torsional stiffness of motors and first mode of antenna in working condition is analyzed, and the critical value of the axial stiffness in accordance with the antenna technical requirements is above 0. 035N/m. The research is valuable to relative theory research and engineering calculation.%采用大型有限元软件MSC.NASTRAN,对嫦娥一号卫星定向天线压紧与展开两种工作状态下的模态与压紧状态下的加速度动力学响应,进行数值计算分析.针对双轴定向天线结构特点,结合双轴电机试验参数,引入扭簧单元对双轴电机结构进行模拟,并将天线压紧状态下的固有频率和关键点的加速度响应计算结果与试验结果进行了对比分析,两者具有较好的一致性,证明了有限元模型建立及扭簧处理方法的正确性.研究了天线展开状态下双轴刚度与系统一阶模态之间的关系,提出了符合天线技术要求的轴向刚度的临界值,即应大于0.035N/m.计算模型、方法对相关的工程研究和计算有一定的参考价值.
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