超机动飞行非线性动态逆-模糊自适应控制

Nonlinear dynamic lnversion-fuzzy self-adaptive control for supermaneuverable flight

对带推力矢量飞机的飞控设计问题进行了研究。根据奇异摄动理论将受控状态变量分为快变量和慢变量 ,然后根据非线性动态逆理论分别对内环和外环进行设计。针对非线性动态逆要求准确的数学模型的特点 ,引入模糊自适应控制以考虑模型的不确定性。最后对所设计的飞控规律进行过失速机动仿真。结果表明 ,在存在较大模型误差的情况下 ,所设计的飞控规律完全能在过失速机动条件下控制飞机跟踪指令飞行。

The design of the flight control system with the vectored thrust is discussed. The flight state variables are separated into fast and slow variables in terms of perturbation theory. Nonlinear dynamic inversion is adopted to design them separately. At the same time, the fuzzy self adaptive control is introduced in the design because of nonlinear dynamic inversion need precision mathematical model. The result control system is demonstrated using post stall maneuver simulation, the results show that this control law achieves a high level performance in post stall maneuver conditions even if the aircraft model has large uncertain items.