基于多模型的飞控系统执行器故障调节

Multi-model Based Actuator Fault Accommodation Scheme for Flight Control Systems

提出了基于多模型自适应控制重构的各种执行器故障调节算法。在故障情况下,对飞控系统执行器的二阶动态特性进行了描述,并建立了自适应多模型(观测器),来描述不同故障情况下系统的特性。虽然存在执行器故障的不确定性,但是,根据Lyapunov稳定性定理证明了在自适应重构控制器的作用下,故障后系统的跟踪误差渐近地收敛于零。仿真结果证实了所提出的故障检测及调节算法能达到预期的目标。

A stable adaptive control reconfiguration approach is developed based on multiple models for flight control systems with various unknown actuator faults. Typical faults of actuators in flight control systems described by second-order dynamics are considered and the fault diagnosis algorithms are derived. A series of multiple models （observers） are designed to describe the dynamics of faulty systems. With the designed adaptive reconfiguration controllers, according to Lyapunov theorem, it has been proved that the tracking error tends to zero asymptotically, and the faulty system response, despite the actuator faults, converges toward that of reference model. An aircraft example is illustrated to indicate the performance of the proposed fault diagnosis scheme.