基于自适应二阶终端滑模的航天器有限时间姿态机动算法

针对航天器有限时间姿态机动问题,提出一种自适应二阶终端滑模控制算法。设计一种终端滑模面,保证系统状态能够在有限时间内沿滑模面收敛到系统原点;为克服系统抖振,设计了二阶终端滑模控制器,并采用参数自适应估计项补偿系统中的外部干扰力矩。基于Lyapunov函数法证明了二阶自适应终端滑模控制器能够保证闭环系统实际有限时间稳定。仿真结果表明,提出的姿态机动算法响应速度快、精度高,能够有效实现对系统抖振和外部干扰的抑制,具有重要的科学意义和工程应用价值。

Spacecraft attitude maneuver algorithm design based on adaptive second-order terminal sliding mode

In order to solve the attitude maneuver problem of rigid spacecraft, an adaptive second-order terminal sliding mode controller is designed in this paper. Firstly, a terminal sliding mode surface is designed to guarantee that the system states can converge to the original point along the sliding surface in finite time. Secondly, a second-order terminal sliding mode controller is designed to overcome chattering, and an adaptive estimation parameter is adopted to compensate the external disturbances. The Lyapunov function methods proves that the designed algorithm can guarantee that the closed-loop system is practical finite-time stable (PFS). The simulation results show that this algorithm can achieve fast response and high accuracy, and can effectively restrain the system chattering and the external disturbance.