The satellite-borne data transmission antenna is the main disturbing source of low-frequency microvibration of spacecraft, which immensely affects the image quality of remote sensing satellite. In this paper, the dynamic characteristics of flexible load driven by stepping motor on flexible boundary are studied. The dynamic equation of the stepping motor driven by current subdivision is simplified by linearization method. The dynamic model of flexible load driven by stepping motors on flexible boundary is established by using the Dynamic Substructure Method, and the analytical expression of microvibration of the data transmission antenna is given. The coupling relationship between the stepping motors and the flexible structure is analyzed by modal coordinate transformation. The microvibration model is verified by simulation and experiment, and the main causes and coupling factors of microvibration are explained. The results show that the model can accurately predict the microvibration of the satellite antenna and can be applied to the microvibration prediction in orbit. The reasonable selection of the working velocity of the stepping motors can effectively reduce the microvibration, which provides the basis for the design of the antenna control system.

中文翻译：

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步进驱动双轴数据传输天线动态特性分析与实验研究

卫星数据传输天线是航天器低频微振动的主要干扰源，极大地影响了遥感卫星的图像质量。本文研究了柔性边界上步进电机驱动的柔性负载的动态特性。通过线性化方法简化了由电流细分驱动的步进电机的动力学方程。利用动态子结构方法建立了步进电机在柔性边界上驱动的柔性载荷的动力学模型，给出了数据传输天线的微振动解析表达式。通过模态坐标变换分析了步进电机与柔性结构的耦合关系。通过仿真和实验验证了微振动模型，并解释了微振动的主要原因和耦合因素。结果表明，该模型能够准确预测卫星天线的微振动，可应用于轨道微振动的预测。合理选择步进电机的工作速度可以有效地减小微振动，这为天线控制系统的设计提供了基础。