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考虑可重复使用运载器再入段参数不确定性和外界干扰影响,提出一种基于自适应模糊H∞控制的姿态复合控制策略.该策略利用模糊系统在线逼近飞行器模型不确定性项,并设计H∞控制项以补偿模糊系统建模误差和外界干扰.为避免引入的H∞控制项对模糊系统逼近特性的削弱问题,在姿态角模糊逼近区域内基于自适应模糊H∞控制设计姿态跟踪控制器以保证飞行器跟踪性能;在姿态角模糊逼近区域外基于边界自适应技术设计姿态镇定控制器以确保飞行器稳定性.基于Lyapunov理论的稳定性分析,证明了闭环控制系统的稳定性且姿态跟踪误差收敛于原点附近的小邻域中.通过再入飞行器六自由度模型的仿真,验证了所提出控制策略的有效性.
Considering the uncertainty of parameters of reusable reusable vehicles and the influence of external disturbances, an attitude control strategy based on adaptive fuzzy H∞ control is proposed in this paper. The fuzzy system is used to approach the uncertainties of aircraft model online and to design H∞ control term to compensate fuzzy system modeling errors and external disturbances.In order to avoid the weakening of the approximation property of fuzzy system by introducing H∞ control term, attitude tracking control is designed based on adaptive fuzzy H∞control in the attitude approximation region To ensure the tracking performance of the aircraft. The attitude stabilization controller is designed based on the boundary adaptive technique to ensure the stability of the aircraft outside the ambiguous approximation region of attitude angle. Based on the stability analysis of Lyapunov theory, the stability of the closed-loop control system and the attitude tracking error Converges to a small neighborhood near the origin.A simulation of six-freedom model of reentry vehicle is used to verify the effectiveness of the proposed control strategy.