失谐大型天线结构的振动模态局部化研究

缠绕肋碟型星载天线属于典型的弱耦合周期结构，针对小量失谐的缠绕肋碟型星 载天线振动模态局部化现象进行了研究，建立了该类天线结构的动力学模型。利用该理论方 法进行动力学分析，建模简单，计算快捷。同时利用理论方法和ANSYS对算例结构进行了计 算，结果表明：小量的失谐即会导致结构产生明显的局部共振；且两种计算结果取得较好的 一致性，无量纲化频率误差小于3％。

Study on Vibration Mode Localization of Disordered Large Antennas

Wrapped rib dish antenna is a kind of typical weak coupling periodic structure.Vibration mode localization of small disordered wrapped rib dish antenna was studied.The dynamics model of this kind of structure was established.It was easy to performance analysis and modeling of the structure by using the method.Simulation by the method above and ANSYS was conducted respectively.Numerical results show that small disorder of the structure can induce remarkable local resonance.The two simulation results have good consistency and the frequency errors between them are less than 3%.