有地面干扰的动导数计算方法

提出了一种有地面干扰情况的飞行器动导数计算方法，其基本思路是从非定常升力面气动力理论出发，利用飞行器的低频运动的气动力，通过振动频率的级数展开，选用适当的气动力部分进行积分，得到所需的气动力导数，为阿了面的影响，将传统的镜像法结合到非定常用功力理论理论方法中，计算结果表明，地面干扰随距地面的高度变化而迅速变化，而且某些动导数的符号都发生了变化，说明地面干扰城飞行动力学的分析是应该加以考虑的。

Numerical Calculation of Dynamic Stability Derivatives in Ground Effect

A numerical method is presented to calculate the dynamic stability derivatives of aircraft type configurations with ground effect. The three dimensional unsteady lifting surface theory is used to supply with the oscillatory airloads, and the unsteady airloads is written as Maclaurin series. After the higher order terms are omitted, the first and second order dynamic stability derivatives are obtained. To take account of the ground effect, the conventional image method is used here. It is found that the ground effects on different dynamic stability derivatives are different, and the ground effect must be taken into account in analyzing the flight characteristics.