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针对一类后掠翼可变的变体飞行器,考虑同时存在状态时滞和随机丢包的网络环境,基于切换系统理论,研究了变体飞行器闭环故障检测滤波器的设计问题。将变体飞行器建模成以高度、马赫数和后掠角为参变量的切换系统。为了保证系统能够有效检测出系统故障并且跟踪指令信号,基于一体化方法,设计基于模态依赖观测器的故障检测滤波器和基于残差估计的输出容错控制器。通过多Lyapunov-Krasovskii函数方法和平均驻留时间方法分析系统在异步切换情况下的稳定性。以线性矩阵不等式的形式给出满足给定性能指标滤波器和控制器存在的充分条件。通过仿真验证了所提方法能够有效检测出故障,输出信号能够准确跟踪指令信号,且在不确定情况下具有较好的鲁棒性。
Aiming at a kind of variable flight aircraft with swept back wing, considering the network environment with state delay and random packet loss, the design of closed-loop fault detection filter for variant aircraft is studied based on the switching system theory. The variant aircraft is modeled as a switching system that takes the altitude, the Mach number, and the sweep angle as arguments. In order to ensure that the system can effectively detect system faults and track command signals, a fault detection filter based on modal-dependent observer and an output fault-tolerant controller based on residual estimation are designed based on an integrated approach. The stability of the system under asynchronous handover is analyzed by the method of multi-Lyapunov-Krasovskii function and the average dwell time. In the form of linear matrix inequalities, sufficient conditions for the existence of filters and controllers for a given performance index are given. Simulation results show that the proposed method can effectively detect the fault, the output signal can accurately track the command signal, and it has better robustness under uncertain conditions.