空间长系绳系统动力学与释放方法研究

Research on Dynamics and Deployment Method for Long Space Tether System

针对绳系载荷远距离释放问题,研究了长系绳系统释放过程的动力学特性。考虑系绳质量及面外角,建立了长绳系卫星系统动力学模型。针对空间长系绳系统展开任务要求,提出了分段多次展开的思想,将系绳的展开过程多段化,多次应用标称控制律,利用差分进化算法优化得到每段展开结束时的系绳长度。仿真结果表明,应用多次展开标称控制律不仅可以精确完成系绳的展开,而且有效抑制了长系绳展开过程中速度过大的问题,可以满足长系绳展开的速度要求。这为今后远距离系绳展开与控制提供理论参考。

This paper studies the control strategy of the deployment for long space tether system. Dynamic charac- teristic of the long tethered satellite is researched and analyzed in the deployment process. The mathematical model is established through Lagrange Equation, considering the mass of the tether and the out-plane angle of the sub-sat- ellite. Multi-deployment method is proposed according to the requirements of the deployment of the long space tether system. The deployment process is divided into several sections, and the length of tether in each section is opti- mized with differential evolution algorithm. The nominal control low is applied in every section. Numerical simulation results prove that the proposed control law could not only deploy the sub-satellite to the right location, but also reduce the maximum velocity of deployment of sub-satellite effectively. Multi-deployment method can satisfy the requirement of long tethered satellite deployment. It has theoretical value and can be used in the further re- search.