三体直连式旋转电动力绳系卫星系统起旋过程柔性形变控制

Flexible deformation control of spinning electrodynamic three-inline tether satellite system during its spin-up process

中文关键词  电动力绳系卫星系统  起旋  柔性形变  预设性能  滑模控制

英文关键词  electrodynamic tether satellite system  spin-up  flexible deformation  prescribed performance control  sliding mode control

中文摘要

      本文研究了三体直连式绳系卫星系统利用电动力从静止状态起旋加速至期望旋转速率的控制问题. 由于 两根系绳之间的耦合效应, 绳系卫星系统的系绳变形干扰相比单根系绳系统更加明显, 这也是目前绳系卫星系统起 旋控制所面临的主要挑战. 针对上述问题, 本文仅通过调节系绳上的电流, 在实现两根系绳稳定同步起旋的同时抑 制系绳的柔性形变. 首先, 建立了用于控制器设计的拉格朗日近似模型和用于仿真验证的柔性珠点模型; 其次, 针对 绳系卫星系统起旋过程中的系绳柔性形变问题, 提出了一种基于预设性能的自适应滑模控制器. 仿真结果表明: 在 该控制策略的作用下, 系绳实现了稳定的自旋运动, 且系绳变形被抑制到较低水平.

英文摘要

      This paper studies the control problem of three-inline tether satellite system using electric power to accelerate from a stationary state to the desired spinning rate. It has been found in this paper that, due to the coupling effect of two tethers, more significant tether deformation emerges during the spin-up process than that of a single tether system, which is the main challenge for the spin-up process of tether satellite system. To solve this problem, in this paper, the feedback control of the current is investigated to suppress the flexible deformation of the tether in the spinning process, to achieve the stable and synchronous spinning of the two tethers. Firstly, the Lagrange approximation model for controller design and the flexible lumped model for controller verification are established. Secondly, an adaptive sliding mode controller based on prescribed performance is proposed to solve the deformation problem of tethered satellite system. Numerical simulation results demonstrate that under the regulation of this control strategy, the spinning motion of the tether can achieve stable performance and the tether deformation is suppressed to an insignificant level.