柔性全充液航天器大角度姿态机动混沌动力学

研究了受液体燃料黏性阻尼及柔性附件扭振影响的全充液航天器由最小惯量轴向最大惯量作大角度姿态机动过程中的混沌姿态动力学, 尤其是液体燃料和柔性附件振动的耦合效应对航天器姿态动力学的影响. 推导了耦合系统的动力学方程并利用尺度化方法将其转化为扰动系统的标准形式以便应用Melnikov方法对系统进行混沌姿态预测.推导了以系统参数形式表达的混沌姿态预测的解析准则. 将利用数值方法所得到的对系统的数值仿真结果与Melnikov解析准则进行了比较和评述. 研究了诸如航天器构型、液体燃料惯量及阻尼、柔性附件固有频率等系统特征量对混沌姿态的影响. 

CHAOTIC DYNAMICS OF LIQUID-FILLED FLEXIBLE SPACECRAFT IN THE LARGE ANGLE ATTITUDE MANEUVER

In this paper, the chaotic dynamics of liquid-filledflexible spacecraft is investigated in the large angle attitude maneuverfrom minor axis to major axis with the influence of viscous damping ofliquid fuel and the torsional vibration of flexible appendage. In addition,the coupled influence is focused in this paper. The dynamic equations arederived and transformed into a perturbation form. Melnikov's integral methodis used to predict the chaotic attitude of the spacecraft, compared with thenumerical results of the system. Furthermore, the effects on chaoticattitude of the spacecraft are investigated of spacecraft shape, theinertial momentum and the damping properties of liquid fuel, and thefrequency of flexible appendage.