基于鲁棒故障观测器的非线性离散系统容错控制设计

针对存在执行器故障以及未知干扰的非线性离散系统,提出了一种鲁棒故障估计与容错控制方法。首先在未知系统干扰作用下,设计鲁棒故障观测器实现系统状态和执行器故障的同步估计;然后根据鲁棒故障观测器得到的系统状态估计和故障估计信息设计容错控制器,进行状态反馈容错控制,同时基于D稳定与H_∞控制理论对鲁棒故障观测器和容错控制器进行设计,实现了多约束条件下的故障估计与容错控制;最后用飞行控制系统模型验证了所提方法的有效性。

Fault-tolerant control design for nonlinear discrete-time systems based on robust fault observer

A method of robust fault estimation and fault-tolerant control is proposed for nonlinear discrete-time systems with actuator faults and unknown system disturbance.Firstly,the robust fault observer is designed to realize the synchronous estimations of system states and actuator faults under the influence of unknown system disturbance.Then,the fault-tolerant controller is designed to perform state feedback fault-tolerant control,which is based on the estimation information of system states and faults obtained by the robust fault observer.At the same time,the robust fault observer and the fault-tolerant controller are designed by D-stability and H_∞control theory to realize fault estimation and fault-tolerant control under multiple constraints.Finally,the flight control system is used to verify the effectiveness of the proposed method.