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本文研究了自由振荡风洞实验获取的动导数如何在飞行器动态特性分析、轨道仿真和飞行控制设计等飞行力学课题中应用的问题。讨论了将随振幅变化的动导数变换为随迎角变化的动导数的两种近似换算方法,提出了动导数换算的递推 辨识算法和多项式形式动导数的系数辨识算法。其中递推-辨识算法和多项式形式动导数的系数辨识算法都得到了令人满意的结果。
In this paper, we study how the kinetic derivatives obtained by the free-vibration wind tunnel experiment are applied in flight mechanics, such as dynamic analysis of aircraft, orbit simulation and flight control design. Two approximation methods of converting dynamic derivatives with amplitude variation into dynamic derivatives with varying angles of attack are discussed. A recursive identification algorithm for dynamic derivative conversion and a coefficient identification algorithm for polynomial dynamic derivatives are proposed. Among them, the recursion-recognition algorithm and the coefficient identification algorithm of the polynomial form of dynamic derivatives all have satisfactory results.