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Adaptive Vectored Thrust Deorbiting of Space Debris

机译:空间碎片的自适应矢量推力除轨

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摘要

A novel but simple deorbiting control system is proposed for cleaning up space debris in a low Earth orbit. The method consists of employing a low-thrust spacecraft tug with a continuously varying thrust direction for collecting and decelerating debris items at a given orbital radius. A time-linear thrust-direction profile is the outcome of the nominal, two-point boundary-value problem for deceleration by a given velocity magnitude. Three simple model reference adaptive control strategies are proposed for driving the velocity error from nominal to zero in the presence of uncertain debris mass and rocket thrust variation. Although linear time-varying control with velocity feedback and a dead-zone is sufficient to minimize tracking error in most cases, it is improved significantly by a Lyapunov-based controller that guarantees asymptotic stability in the presence of a random but bounded acceleration disturbance. A nonlinear feedback adaptation law based upon the MIT rule achieves the fastest error decay rate error of the three techniques and is seen to have a logarithmic relationship between the steady-state value of controller parameter and adaptation gain.
机译:提出了一种新颖但简单的除轨控制系统,用于清理低地球轨道上的空间碎片。该方法包括采用推力方向连续变化的低推力航天器拖船,以在给定的轨道半径处收集和减速碎片。时间线性推力方向曲线是给定速度幅度下的名义两点边界值问题的结果。提出了三种简单的模型参考自适应控制策略,用于在存在不确定的碎片质量和火箭推力变化的情况下将速度误差从标称值驱动为零。尽管在大多数情况下,具有速度反馈和死区的线性时变控制足以将跟踪误差降至最低,但基于Lyapunov的控制器可以显着改善这种情况,该控制器在存在随机但有界的加速度扰动的情况下保证渐近稳定性。基于MIT规则的非线性反馈自适应定律可以实现三种技术中最快的误差衰减率误差,并且可以看到控制器参数的稳态值与自适应增益之间具有​​对数关系。

著录项

  • 来源
    《Journal of Spacecraft and Rockets》 |2013年第2期|394-401|共8页
  • 作者

    Ashish Tewari;

  • 作者单位

    Indian Institute of Technology, Kanpur 208016, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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