The space truss deployable antenna has low natural frequency, multi-closed-loop, and multiredundant structure characteristics, which is a kind of flexible antenna. It is hard to obtain the vibration characteristics under low frequency by finite element analysis or conventional shaking table test. To verify the structure characteristics of the antenna in the folded state below 2 Hz, a low-frequency vibration system is established based on the 6-DOF Stewart platform. Rotation matrix analysis method was adopted to obtain the platform’s velocity and acceleration characteristics. Then, a low-frequency vibration test was carried out on the platform. The results show that the natural frequency of the antenna is 1.51 Hz and the maximum dynamic displacement is 140.6 mm, which provides a certain foundation for the further development of the space truss antenna.

中文翻译：

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Stewart平台在卫星空间桁架展开天线低频振动特性测试中的应用

空间桁架展开天线具有低固有频率、多闭环、多冗余结构特点，是一种柔性天线。通过有限元分析或常规振动台试验很难获得低频下的振动特性。为验证天线在2Hz以下折叠状态下的结构特性，基于6自由度Stewart平台建立低频振动系统。采用旋转矩阵分析方法获得平台的速度和加速度特性。然后，在平台上进行了低频振动测试。结果表明，天线的固有频率为1.51 Hz，最大动态位移为140.6 mm，