强未知输入干扰下的飞控伺服作动系统鲁棒故障检测

Robust Fault Detection of Flight Control Servo System under Strong Unknown Input Disturbances

针对飞控伺服作动系统具有非线性、多种强未知输入干扰的特点,基于未知输入观测器进行了系统的鲁棒故障检测研究。考虑飞控伺服作动系统的气动力负载、供油压力波动等强未知输入干扰,建立了系统的非线性模型。采用一种全阶未知输入观测器结构设计了系统的未知输入观测器,并给出了观测器求解算法。对飞控伺服作动系统的非线性模型进行了转化,并给出了使用未知输入观测器的系统故障检测方法。进行了多种强未知输入干扰下的飞控伺服作动系统鲁棒故障检测的仿真试验,验证了故障检测算法的有效性和鲁棒性。

Considering the flight control servo system＇ s characteristics of nonlinear and various strong unknown input disturb-ances, the system robust fault detection method based on unknown input observer （UIO） is studied. The nonlinear model was estab-lished which considered aerodynamic force load and pressure fluctuation of fuel supply. The design principle of UIO was explored baseon a full order UIO observer structure. From this, observer＇ s resolve algorithm was designed. The nonlinear model of flight control sys-tem was transformed, and the system fault detection method was given by using UIO. Simulation test of robust fault detection of flightcontrol servo system which works under various strong unknown input disturbances is carried out, and the validity and robustness of thefault detection algorithm are verified.