飞机大振幅非定常滚转运动的非线性稳定性分析

A Nonlinear Stability Analysis for an Aircraft Rolling in Large Amplitude Motion

本文根据某飞机大振幅非定常滚转力矩的风洞试验结果 ,采用两种方法 ,计算了飞机绕体轴作自由滚转运动时的滚转角时间历程 ,分析研究了飞机非线性滚转运动的稳定性 ,并对非定常空气动力对飞机稳定性的影响作了较深入的研究。本文通过两种滚转运动时间历程结果的比较 ,表明了给出的从大振幅实验提取常规动导数方法是可行的 ;而且也表明了通过测量飞机绕体轴滚转时大振幅非定常滚转运动时的滚转力矩值 ,可以研究飞机的摇滚(Wingrock)特性 ,从而使大振幅非定常空气动力风洞试验既能提取常规动导数 ,又能进行飞机摇滚特性的研究 。

Two methods are used to calculate the time history of rolling angle for an aircraft free rolling around the body axes according to the wind tunnel test data of the unsteady roll moments for theaircraft in large amplitude rolling motion. The stability of the nonlinear roll motion is analyzed and the effect of unsteady aerodynamic on the stability is studied. By comparing the results of the two methods, it is indicated that the method extracting the general dynamic stability derivative from the wind tunnel test data for the aircraft in large amplitude rolling motion is reasonable and that the wing rock characteristic of the aircraft can be studied by measuring the unsteady roll moment. Therefore, the three experimental methods (unsteady aerodynamic in large amplitude rolling motion, general dynamic stability derivative, free to roll test) can be combined into one.