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  

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

作　　者：冉德超[1] 倪庆[1] 绳涛[1] 陈小前[1] 

机构地区：[1]国防科技大学航天科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2017年第1期6-10,共5页Journal of National University of Defense Technology

基　　金：国防科技大学优秀研究生创新资助项目(B15017)

摘　　要：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。In order to solve the attitude maneuver problem of rigid spacecraft, an adaptive second-order terminal sliding mode control algorithm as designed. A terminal sliding mode surface was designed to guarantee that the system states can converge to the original point along the sliding urface in finite time; a second-order terminal sliding mode controller was designed to overcome chattering, and an adaptive estimation parameter as adopted to compensate the external disturbances. The Lyapunov function methods proved that the designed algorithm can guarantee that the osed-loop system is practically finite-time stable. The simulation results show that this algorithm can achieve fast response and high accuracy, can fectively restrain the system chattering and the external disturbance, and has important scientific significance and engineering value.

关 键 词：航天器 姿态机动 二阶终端滑模 有限时间控制 自适应估计 

分 类 号：V448[航空宇航科学与技术—飞行器设计]