飞机突防航迹的非线性解耦跟踪

NONLINEAR DECOUPLING CAPTURING OF AIRCRAFT PENETRATION TRAJECTORY

针对12维非线性飞机动力学模型,利用非线性逆系统理论和现代最优控制理论设计了一组非线性飞行控制规律。这组控制规律通过解耦控制飞机的飞行速度(V)、滚转角(φ)、航迹角(γ)和偏航角(φ_w),使飞机能够精确地跟踪期望的三维突防航迹。计算结果表明,由于这组控制规律计及了飞机动力学模型中的非线性因素,能够完全消除飞机的剧烈耦合反应,从而有效地改善了飞机的动态特性,提高了其低空机动飞行的安全性,大大减轻了驾驶员的工作负担和精神压力,从而圆满地完成突防袭击任务。

Based on 12-state nonlinear aircraft dynamic model,a nonlinear flight control law is designed by using nonlinear inverse dynamics and modern optimal control theory. This control law could guarantee aircraft accurately capturing desired 3-dimension penetration trajectory by decoupling control the flight velocity (V) ,bank angle (φ), path angle(γ) and yaw angle (ψw). The numerical result illustrates that,as the controller more accurately represents the nonlinear factors that arise in aircraft dynamic model and eliminates the violent coupled response of the basic aircraft model completely, so the decoupling control system is extremely effective to the improvement of aircraft dynamic behavior and offers the potential for providing improved levels of safety. The work load and mental pressure of the pilot could be reduced greatly. Therefore, the task of penetration flight could be accomplished more efficiently.