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针对临近空间飞行器中未知的执行器控制效益损失和漂移故障,提出了一种模型参考滑模容错控制方法,保证故障系统对参考模型的稳定跟踪性能。利用跟踪误差系统设计容错控制器,首先构造积分滑模面,以增强系统鲁棒性并消除稳态误差;随后,在无需故障诊断单元的条件下设计模型参考滑模控制律,使其增益能实现自适应调节以处理未知故障影响,其中自适应律基于李雅普诺夫稳定性理论设计,保证闭环系统稳定。在临近空间飞行器纵向动力学模型上的仿真验证表明,该方法能处理执行器中发动机节流阀调节通道和升降舵偏转量通道的不同故障,保证系统获得满意的鲁棒容错跟踪性能。
Aiming at the unknown control efficiency loss and drifting failure of the near spacecraft, a fault-tolerant control model of reference skid model is proposed to ensure the stable tracking performance of the faulty system to the reference model. The fault-tolerant controller is designed by using the tracking error system. Firstly, the integral sliding mode surface is constructed to enhance the system robustness and eliminate the steady-state error. Then, the model-controlled sliding mode control law is designed without fault diagnosis unit, Adaptive adjustment to deal with the impact of unknown failures, in which the adaptive law based on Lyapunov stability theory to ensure the stability of the closed-loop system. Simulation results on the longitudinal dynamics model of the spacecraft show that the proposed method can deal with the different failures of the engine throttle control passage and the elevator deflection passage in the actuator so as to ensure the satisfactory robust fault-tolerant tracking performance of the system.