【摘要】 星载数传天线是航天器低频段微振动的主要扰振源，严重影响了遥感卫星成像质量。研究了一种以步进电机为驱动源的数传天线的微振动特性。通过线性化方法简化了步进电机的动力学方程，根据固定界面模态综合法建立了在柔性边界上步进电机驱动柔性负载的动力学模型，并给出了数传天线微振动的解析表达式。通过仿真和试验验证了上述微振动模型，分析了微振动的成因和影响因素。结果表明：试验和仿真得到的微振动频域峰值处的频率一致，幅值误差不超过9.41%。并且合理选择步进电机转速可有效降低数传天线的微振动。该模型可应用于在轨微振动预测、天线控制系统设计等领域。更多还原

【Abstract】 The micro vibration characteristics of a data transmission antenna driven by stepping motors were studied. The dynamic equation of the stepping motor was simplified by the linearization method. According to the fixed interface mode synthesis method, the dynamic model of a stepping motor driving the flexible load on the flexible boundary was established, and the analytical expression of the micro vibration of the data transmission antenna was given. The above micro vibration model was verified by simulation and experiment, and the causes and influencing factors of micro vibration were analyzed. Results show that the frequency at the peak of frequency domain obtained by experiment and simulation is consistent, and the amplitude error is less than 9.41%. The micro vibration of data transmission antenna can be effectively reduced by reasonably selecting the velocity of stepper motor. The model can be used in the fields of on orbit micro vibration prediction and antenna control system design.更多还原