飞机自动着陆的模糊控制系统设计

The Design of Fuzzy Control System for Aircraft Automatic Landing

使用反馈线性化与改进的模糊控制方法设计飞机纵向自动着陆控制系统。通过状态变换输出与新输入间的线性微分关系使非线性飞机方程反馈线性化,将原非线性系统解耦为一个一阶和一个二阶线性系统。同时,采用带优化修正函数的无量化模糊控制器,使系统能在比较粗糙的初始规则基础上自动寻找较理想的控制规则。其纵向着陆仿真研究,主要考虑下滑段和拉平段。仿真表明,该控制系统能满足纵向着陆误差要求,具有良好的动、静态特性和鲁棒性。

The control system for longitudinal automatic landing of an aircraft was designed with the methods of feedback linearization and improved fuzzy control. The nonlinear equation of aircraft is linearized by state transforming differential relationship between input and a new input, and the nonlinear system is decoupled to a one order linear system and a two order linear system. Simultaneously, because of using without quantification fuzzy controller with optimal corrective function, the system can automatically search ideal control rules on the base of rough initialized rules. Gliding and leveling are considered in longitudinal landing simulation study. Simulation results show that the control system can satisfy the requirement of longitudinal automatic landing of an aircraft, and has excellent dynamic, static and robustness performances.