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。
Abstract
To study disturbance of satellite antenna with flexible antenna surface, the fixed-interface component-mode synthesis method and Lagrange’s equations is used to achieve a lower order dynamic model by modal truncation. Under the large motions, the rigid-flexible coupling dynamics model of flexible satellite antenna is deduced through compatibility relations at the interface between axis end and antenna surface, and compensate for the neglect of elastic deformation. So the model should increase the computing efficiency without losing much accuracy. Then, satellite antenna dynamics is analyzed considering the antenna surface as rigid and flexible body separately. The result shows that the flexible antenna surface has little effect on satellite base attitude and antenna pointing at initial stage, but the shock may excite to aggravation its own elastic vibration with the joint continuing torques. Further, it can make the system vibrated and deviations of satellite base attitude and antenna pointing become larger. At the result, the satellite antenna pointing accuracy is seriously affected. The above conclusion has important theoretical value and practical significance engineering for the satellite antenna pointing accuracy of the analysis and control.
关键词
星载天线 /
模态综合 /
柔性天线面 /
弹性振动 /
扰动
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Key words
Satellite Antenna /
Component-Mode Synthesis /
Flexible Antenna Surface /
Elastic Vibration /
Disturbance
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游斌弟;赵志刚;魏承;赵阳.
柔性天线面对星载天线的扰动研究[J]. 振动与冲击, 2011, 30(7): 107-111,
YOU Bin-di;ZHAO Zhi-gang; WEI Cheng; ZHAO Yang.
Research on Disturbance of Flexible Antenna Sheet on Satellite Antenna[J]. Journal of Vibration and Shock, 2011, 30(7): 107-111,
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脚注
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