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针对近空间飞行器的执行器故障,在考虑控制输入约束情况下,本文提出了一种基于模型预测控制思想的容错控制策略。该方法主要是结合线性状态反馈控制与非线性模型预测控制的优点,构成容错控制律,然后通过自适应观测器的方法进行故障估计,并将得到的故障信息反馈到系统,能够保证闭环系统的稳定性,而且在系统发生执行器故障的情况下能够跟踪给定的指令。最后在Matlab中针对X-33模型进行仿真,验证该容错控制算法的有效性。
Aiming at the actuator failure of near space vehicles, a fault tolerant control strategy based on the idea of model predictive control is proposed in this paper. This method mainly combines the advantages of linear state feedback control and nonlinear model predictive control to form a fault-tolerant control law, and then estimates the fault through the adaptive observer method and feeds back the fault information to the system to ensure that the closed-loop system Stability, and can track a given instruction in the event of an actuator failure in the system. Finally, the X-33 model is simulated in Matlab to verify the effectiveness of the fault-tolerant control algorithm.