飞机敏捷性的非线性解耦飞行控制增强

Agility Enhancement from Nonlinear Decoupling Flight Control

带传统线性控制器飞机在大迎角高机动飞行时敏捷性明显地减小，运动状态严重耦合更加重这一趋势，而此时操纵能力往往仍有剩余而却未能被利用。针对此问题，应用非线性反馈理论直接就飞机非线性运动模型设计输入输出解耦飞行控制器。数值仿真结果证实，这种设计能够纳入气动和运动学非线性因素，充分利用飞机操纵潜力，因而使前述薄弱区域的闭环敏捷性得到了有效的增强，明显地扩大了敏捷性包线。

The agility of aircraft with conventional linear flight controllers tends to drop rapidly under high angles of attack, and kinematic coupling of motions furtherly promotes the tendency. On the other hand, the control power may be still available up to the maximum lift region, and yet undeveloped. Focused on such problems, endeavors are made in this paper to design input-output decoupling flight controllers directly on the DOF nonlinear mathematical model of aircraft, with the theory of nonlinear feedback applied. Digital simulations show that the design procedure can incorporate aerodynamic and dynamic nonlinearity into consideration and, therefore, bring the control power into full play. In result, the closed-loop agility can be effectively improved in the above-mentioned flight region, and the maneuvering envelope be enlarged.