This paper proposes a scaled model to investigate the dynamic characteristics and stability of a hoop truss antenna on the ground. First, the statically indeterminate equation for the multi-point suspension is established, along with the voltage of the suspension motor calculated. Then the transfer function of the system is theoretically established. The scaled model is established before and after suspension, and the static deformation and natural frequency of the system are obtained by calculation and measurement. There exist the shaking mode and nodding mode. Also, a vibration experiment is conducted for the system to obtain the vibration response. With this, the transfer function is identified by the system identification method, which appears to be of the second order, and the stability is analyzed through the zero pole diagram. The experiment results show that the first two frequencies are close before and after suspension. Moreover, the stability of the system can be judged by the open-loop transfer function. It is concluded that the vibration experimental data of the scaled model can be used as a reference for the large hoop truss antenna structure.

中文翻译：

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尺度环桁架天线结构的多点悬垂设计及稳定性分析

本文提出了一种比例模型来研究地面箍桁架天线的动态特性和稳定性。首先，建立了多点悬架的静不定方程，并计算了悬架电机的电压。然后从理论上建立了系统的传递函数。建立悬挂前后的比例模型，通过计算和测量得到系统的静态变形和固有频率。有摇晃模式和点头模式。此外，对系统进行了振动实验，以获得振动响应。至此，通过系统辨识法辨识传递函数，看起来是二阶的，通过零极图分析稳定性。实验结果表明，悬吊前后前两个频率接近。此外，系统的稳定性可以通过开环传递函数来判断。得出的结论是，缩放模型的振动实验数据可以作为大环桁架天线结构的参考。