三次样条插值法在气动导数计算中的应用

在飞行仿真建模过程中,快速、精确的气动导数查寻可以提高仿真系统的实时性和逼真性。在研究大量现有气动导数查寻方法的基础上,提出了一种运用三次样条法、双三次样条法进行气动导数查寻的新思路,该方法不仅避免了以往线性插值的"局部性",提高了计算结果的精度,而且还克服了函数(多项式)拟合法导致动力学模型通用性差的缺陷。仿真实验表明,该方法在气动力和气动力矩的计算中是有效的、可行的。

Application of Thrice Spline Method in the Calculation of Aerodynamic Derivatives

In modeling procedures of flight simulation,looking up aerodynamic derivatives fast and accurately can improve the verisimilitude and real-time of simulation system.By researching existing look-up methods of aerodynamic derivatives,this paper puts forward a new method of looking up aerodynamic derivatives using a thrice spline method and a double thrice spline method.This method not only avoids "locality" of conventional linear interpolation and advances the precision of results,but also gets over limitation of universality of a flight dynamic model resulted from fitting function(polynomial).The simulation experiment proves that this method is effective and feasible in the computational process of aerodynamic forces and aerodynamic moments.