星载大型反射面天线主动振动抑制建模分析方法

为研究抑制星载大型反射面天线的在轨振动,文章给出一种基于压电材料的天线臂主动振动抑制建模分析方法。该方法基于整星刚柔耦合动力学模型,通过将压电材料的应力等价为内力矩,应变等价为位移差分,获得卫星动力学、振动抑制与姿态控制的解析式耦合计算模型,进而预测振动抑制后的天线振动传递特性和响应。以某带大型反射面天线的卫星为例,分别从压电材料布局和计算边界条件角度给出主动振动抑制的时域、频域分析结果,并进行对比。分析结果表明:文章所提出的方法能够实现压电材料在天线臂上的布局优化以及获知天线臂主动振动抑制效果。

Active vibration suppression modeling and analysis for large satellite reflector antennas

This paper concerns the active vibration suppression modeling and analysis for the large satellite reflector antenna arm of piezoelectric material. The internal moment and the displacement difference are considered in the place of the stress and the strain of the piezoelectric material, respectively. By building an explicit coupling model based on the rigid-flexible coupling satellite model as well as the vibration suppression and attitude control system, the method can be used to predict the transfer characteristics and the vibration responses of the antenna structure. For a large satellite reflector antenna, the results in the time/frequency domains are analyzed with respect to the piezoelectric material layout and the computing boundary condition, respectively. The analysis results show that the presented method can be used to determine a reasonable layout of the piezoelectric material on the antenna arm, and for the performance analysis of the active vibration suppression.