柔性航天器拖拽空间碎片动力学与控制仿真研究

针对地球静止轨道空间碎片清除需求,开展了服务星通过绳索拖拽空间碎片离轨多体动力学与控制仿真研究.分析了在轨拖拽期间系统拓扑构型,采用递推方法推导了考虑地球J2摄动的服务星和空间碎片柔性多体动力学方程组,建立了基于集中参数法的绳索动力学模型,通过约束方程将绳索与服务星和空间碎片相连接,建立了服务星姿态控制力矩方程,最后形成了服务星在轨拖拽空间碎片期间柔性多体系统多体动力学方程.通过悬链线模型与本文采用的集中参数模型的比较验证了本文采用的柔性绳索模型的正确性,然后通过数值仿真分析了与服务星质量接近的空间碎片被拖动期间动力学特性,为这类航天器总体设计及空间碎片清除策略制定提供了参考依据.

Simulation study on dynamics and control of space debris tugged by flexible spacecraft

According to the demand of space debris removal in the geostationary orbit, the dynamics and control simulation on the process of space debris tugged by flexible spacecraft was studied. The system topology configuration was analyzed, and based on the recursive method, the flexible mutibody system dynamics equations of service satellite and space debris were established, and the J2 perturbation of earth was considered. The cable dynamic model based on the lumped parameter method was also established. The service satellite and space debris were connected through constraint equations. And the attitude control torque of service satellite was calculated by the PD controller. Finally, the flexible multibody system equations of the process ware formulated. The cable model used in this paper was validated through the comparison between the catenary model and the lumped parameter model. The process of the debris tugged by the service satellite was analyzed through numerical simulation, in which the mass of space debris is near to the service satellite mass. Additionally, the corresponding dynamic property was studied, which can give some suggestions on the mission design of service satellite and the strategy of debris removal. © 2018 Journal of Dynamics and Control. All rights reserved.