太阳翼不同转角的卫星在轨模态频率计算方法

On-orbit Mode Frequencies Computing Method of Satellite with Different Rotational Angles of Solar Wing

卫星挠性振动频率会随着太阳翼的转动发生变化,在卫星动力学频率规划设计时尤其需要考虑到,以避免发生耦合振动。文章针对具有太阳翼的卫星,研究了太阳翼转动时由于星体构型变化对卫星模态频率产生的影响。通过建立卫星动力学混合坐标方程,推演出卫星结构动力学特征方程,在太阳翼转到不同角度时对卫星系统模态进行解算,从而获得一种具有太阳翼的遥感卫星系统模态计算方法。以某遥感卫星为背景进行了在轨模态计算,并与该卫星陀螺姿态角速度遥测数据对比,误差小于10%,验证了在轨模态计算方法的准确性。

The flexible vibration frequency of the satellite changes with rotation of the solar wing, it is important to avoid resonance especially in the dynamics frequency planning. In this paper, the flexible dynamics of satellite with rotatable solar wing is researched, and the change of the satellite mode frequencies affected by the configuration variation is studied. Firstly, the hybrid coordinate equations of flexible dynamics of satellite are given to deduct the structural dynamics equations of the whole satellite. Secondly, the characterises equation of the on-orbit modes is given, then the satellite mode frequencies are solved for every rotational angle of solar wing. Finally, a remote sensing satellite is taken for example to verify the accuracy of the method by compare the on-orbit data with the computing result.