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航空学报  2015 

基于新型快速Terminal滑模的高超声速飞行器姿态控制

DOI: 10.7527/S1000-6893.2014.0290, PP. 2372-2380

Keywords: Terminal滑模控制,高超声速飞行器,观测器,鲁棒控制,Lyapunov稳定性

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Abstract:

为了提高Terminal滑模的收敛速度,避免滑模控制器奇异,首先分析Terminal滑模控制器出现奇异的原因,提出了一种新型非奇异快速Terminal滑模,其收敛速度在任意点均快于双幂次形式的Terminal滑模,并给出收敛时间公式。基于此,又改进了一种结构更为简单的非奇异快速Terminal滑模。针对高超声速飞行器姿态模型,利用新型快速Terminal滑模,采用干扰观测器逼近姿态的复合干扰,设计了高超声速飞行器内、外回路Terminal滑模控制器。采用一阶滤波器,消除了由Terminal滑模所导致最终控制器的奇异问题;基于Lyapunov稳定性理论,严格证明了飞行器姿态内、外回路系统的有限时间稳定。最后,通过飞行器在气动参数标称与拉偏情况下的数字仿真,验证了设计方案的有效性。

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