绳系拖曳离轨过程中基于系绳张力的摆动抑制策略研究

绳系拖曳离轨过程,系统运行于非开普勒轨道,系绳摆动呈现复杂的动力学特性,大幅度的系绳摆动会引起拖船的扰动,进而影响整个系统的稳定,因此如何抑制系绳摆动是拖曳离轨任务的一个关键问题。本文以周向常值连续小推力作用下的绳系拖曳离轨为背景,针对离轨过程中的系绳摆动抑制问题,首先建立了系统质心轨道动力学方程及系绳摆动动力学方程,分析了无系绳收放控制时的系绳摆动特性以及系绳收放对系绳摆动的作用效果,然后构造了使系绳摆动衰减的期望绳长收放速率并设计了系绳张力控制律。仿真结果表明：无系绳收放控制时,系绳摆动表现为平衡位置附近的周期性往复运动;张力控制连续平滑,很好地实现了系绳实际长度对期望长度的跟踪,同时有效地抑制了离轨过程中的系绳摆动。

Research on oscillation suppression strategy based on tether tension during tether-tugging deorbiting

During tether-tugging deorbiting, the centroid of the tethered system is in a non-Keplerian orbit, which leads to a complicated oscillation dynamic characteristics and may cause tug"s disturbance and affect the system"s stabilization, so how to suppress tether oscillation is a key issue during tether-tugging deorbiting. This paper is under the background of tether-tugging deorbiting with constant circumferential low thrust, aiming at the issue of tether oscillation suppression. Firstly, the dynamics equations of system centroid orbital movement and tether oscillation are established, and the dynamic characteristics of tether oscillation without tether control and the effect on tether oscillation with tether control is analyzed. Secondly an expect rate of tether which suppress tether oscillation is constructed and tether tension control law is designed. Simulation results indicate that when there is no tether control, tether oscillation is in periodic reciprocating motion around the equilibrium position. Furthermore the tether tension control is continuous and smooth, which makes tether actual length well track to the expected length, and the tether oscillation is suppressioned effectively at the same time.