非平面模型自由飞运动及气动参数辨识的数值模拟研究

Numerical Simulation of NonPlanar Model Free Flightand the Aerodyramic Coefficients Identification

本文通过模型非平面自由飞数值模拟和气动参数辨识研究在忽略非平面运动效应情况下参数辨识的可靠性和精度。分别考虑了轴对称细长体和飞机型两种不同的外形。在有偏航和滚转运动的情况下，仅从记录的俯仰平面的投影角用平面自由飞辨识方法来得到它们的气动阻尼参数。结果表明对飞机型外形气动力结果可产生极大的偏离，而对轴对称体，只要偏航角不太大则无明显影响。

The paper depicts the numerical simulation of nonplanar model free flight and the aerodynamic coefficients identification to study the reliablity and the accuracy of the parameter identification in the case of ignoring nonplanar motion effects.Two kinds of model configurations——an axisymmetric slender cone and an aeroplanelike model are considered.The pitch damping coefficients have been identified by Maximum Likelyhood Method only with the projected anglar motion in vertical plane.The results show that a significant deviation is derived by this way for aeroplanelike model and there is little effects to axisymmetric model.