基于状态空间法的横航向非定常气动力建模

建立了大迎角下横航向非定常气动力的状态空间法的模型,并依据某战斗机的大迎角、大振幅单自由度偏航、滚转及偏航-滚转耦合运动的风洞实验数据,对状态空间模型进行结构辨识与参数估计。最后得到的模型辨识结果和预测值均与实验数据符合得很好,表明所建立的此种状态空间法的模型能准确地描述大迎角横航向非线性、非定常的气动力特性。此外,还得到了不同运动类型的特征时间常数。

State-space representation of lateral-directional unsteady aerodynamic model at high angle of attack

Based on the large amplitude experimental data of one degree-of-freedom yaw and roll,and their coupling oscillations tested in the NH-2 wind tunnel,the state-space representation of lateral-directional unsteady aerodynamics has been carried out structure identification and parameter estimation in this paper.There is a good agreement between mathematically predicted data and measured data.It is shown that the established state-space model can accurately describe the nonlinear and unsteady aerodynamic charact...