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针对存在参数不确定性和外扰的飞行器再入姿态控制问题,提出一种基于准连续高阶滑模的控制方案.首先基于奇异摄动理论将姿态控制系统分为快、慢两回路;随后在慢回路滑模控制系统设计中利用范数型切换函数代替符号函数以使虚拟控制量平滑连续;在快回路设计中,基于积分型快速终端滑模、反馈控制和准连续高阶滑模控制理论设计快回路控制系统.理论分析和仿真结果均表明,该控制方案在增强系统鲁棒性的同时能够有效削弱系统抖振.
A control scheme based on quasi-continuous high-order sliding mode is proposed for aircraft reentry attitude control with parameter uncertainty and disturbance. First, the attitude control system is divided into fast and slow loops based on singular perturbation theory. Then, In the design of a slow-loop sliding mode control system, a norm-type switch function is used instead of a sign function to make the virtual control volume smooth and continuous. In the fast-loop design, the integral type fast terminal sliding mode, feedback control and quasi-continuous high-order sliding mode control The theoretical design of fast loop control system shows that this control scheme can effectively weaken the system chattering while enhancing the robustness of the system.