某无人机大过载水平盘旋的稳定性分析

本文利用线化六自由度运动方程的状态空间式,对某无人机大过载定水平盘旋的稳定性进行分析。首先确定飞行器在各个过载下定常盘旋时的平衡运动参数,然后求动态反应的特征根及特征向量;研究了过载因子n_y从1到4时对该机运动稳定性的影响,用根轨迹图和表示特征向量的阿冈德(Argand)图识别和分析了各运动模态的特性。结果表明,该机运动的稳定性随载荷因子增加而变化,并出现俯仰荷兰滚模态和带滚转分量的长周期模态。

Analysis of the Stability of the Steady Level Turning Flight of a Pilotless Aircraft

The paper makes use of the six dimensional linearized equations of motion to analyse the dynamic stability of the steady level turning flight of an unmanned aircraft. First of all,, the equilibrium parameters of motion at steady level turning flight are determined.Then, the eigenvalues and eigenvector of dynamic response are found. The dynamic stability is studied for load factors ranging from 1 to 4 . The charactristics of mode of motion are identified and analysed by root locus plots and Argand diagrams. The results show that the dynamic stability varies with overload increase and the motion brings forth the Dutch roll mode with patch and the long-period mode with roll.