针对执行器失效的一类飞行控制系统,提出基于迭代学习观测器的模糊容错控制律,利用Takagi—Sugeno(T—S)模糊模型对非线性系统进行描述、建模和控制。一旦系统发生故障,迭代学习观测器在估计系统状态的同时估计执行器的卡死值,然后利用估计的状态和故障信息构成反馈模糊控制律进行调节,以实现故障系统对参考系统的状态跟踪。给出了系统能进行容错控制的参数匹配条件,并利用Lyapunov理论详细分析了系统的稳定性以及闭环系统信号的有界性,某歼击机的仿真实例证明了本文方法的有效性。
Fuzzy fault-tolerant flight control design for actuator failure is proposed using a iterative learning observer; Takagi-Sugeno(T-S) fuzzy model is used to model and control a nonlinear system. After the fault occurred, the iterative learning observer begins to estimate the system states and fault stuck value. The feedback controller is constructed by using the estimated states and the fault information to track the system states. Matching conditions for achieving tolerant control are given. Based on Lyapunov theory, the system stability and the signal boundedness are analyzed. The performance is evaluated using an aircraft model.