摘要
针对柔性天线面对星载天线的扰动问题,应用固定界面模态综合法和Lagrange方程,截取柔性天线面低阶模态,缩减星载天线系统的自由度,并通过轴末端与天线面交界面的协调关系,推导了大范围运动的星载天线刚柔耦合动力学模型,克服了忽略天线面弹性变形对刚体大范围运动的影响,所建立的耦合动力学模型计算效率高并具有足够的精度。考虑天线面为刚体和柔体情况,分别对星载天线系统进行仿真并进行对比分析,结果表明,初始时刻柔性天线面对卫星本体姿态和天线指向影响很小,随着关节力矩持续作用,激起柔性天线面震荡,加剧自身的弹性振动,进而引起星载天线的抖动,造成卫星位姿和天线指向偏差变大,严重影响了星载天线的指向精度。结论对星载天线指向精度的分析与控制具有重要的理论价值及工程实际意义。
To study disturbance of flexible antenna surface on a free-floating satellite antenna,the fixed-interface component-mode synthesis method and Lagrange＇s equations were used to achieve a lower order dynamic model by modal truncation.Under large scale motions,the rigid-flexible coupled dynamic model of the free-floating flexible satellite antenna was deduced through using compatibility relations at the interface between axis end and antenna surface,and neglecting the elastic deformation of the flexible antenna surface.So the model increased the computing efficiency without losing much accuracy.Finally,the free-floating satellite antenna dynamic behavior was analyzed considering the flexible antenna surface as a rigid body and a flexible one,separately.The result showed that the flexible antenna surface has little effect on the satellite base attitude and the antenna pointing at initial stage,but its own elastic vibration grows with the continuous action of joint torques;further,it makes the system vibrate and the deviations of the satellite base attitude and the antenna pointing become larger;the satellite antenna pointing accuracy is seriously affected.The results were valuable for analysis and control of satellite antenna pointing accuracy.
出处
《振动与冲击》
EI
CSCD
北大核心
2011年第7期107-111,132,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(50975056)
关键词
星载天线
模态综合
柔性天线面
弹性振动
扰动
satellite antenna
component-mode synthesis
flexible antenna surface
elastic vibration
disturbance
