过失速飞机纵向快速指向研究

Research on the vertical-plane fast pointing of a post-stall aircraft

研究了过失速飞机利用Cobra机动实现纵向目标快速指向的问题,并分析了俯仰敏捷性和推力矢量对快速指向的影响。首先建立了最短时间Cobra机动的轨迹优化模型,然后运用Legendre拟谱法将该轨迹优化问题转化为非线性规划问题,最后进行了数值仿真,对非线性规划问题进行求解。仿真结果表明,采用Legendre拟谱法能够快速得到问题的最优解,提高俯仰敏捷性和增大推力矢量,有利于加快目标指向的速度,特别是当俯仰敏捷性较差时效果更为明显。

The vertical-plane fast pointing of a post-stall aircraft is researched,and the influence of the pitch agility and thrust vectoring on the fast pointing is analyzed.First,the trajectory optimization model of minimum time Cobra maneuver is given.Then,the trajectory optimization problem is transformed to a nonlinear programming problem by the Legendre pseudo-spectral method.Last,the nonlinear programming problem is solved numerically.The result indicates that the time can shorten by improving the pitch agility and thrust vectoring,especially when the pitch agility is bad.