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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。
Aimed at spacecraft maneuver with finite time, an adaptive second-order terminal sliding mode control algorithm is proposed. A terminal slip surface is designed to ensure that the state of the system converges to the origin of the system along the sliding surface in a finite time. To overcome the chattering of the system, a second-order terminal sliding mode controller is designed and the parameter adaptive estimation term compensation system In the external disturbance torque. Based on the Lyapunov function method, it is proved that the second-order adaptive terminal sliding mode controller can guarantee the closed-loop system stability for a finite time. The simulation results show that the proposed attitude maneuvering algorithm has the advantages of fast response and high precision, which can effectively suppress the chattering and external disturbance of the system, and has important scientific significance and engineering application value.