【摘要】 介绍了南京航空航天大学NH-2风洞中建立的大振幅运动动态实验台。某战斗机模型在该实验台进行大振幅运动动态实验,测量了模型作单独俯仰、偏航、滚转运动时的非定常空气动力。在非线性阶跃函数模型和小波分析理论的基础上,将小波应用于非线性阶跃函数模型,进行气动力建模。在建模过程中,以模型的大振幅运动实验结果为样本数据,并将建模结果与实验数据进行对比。为了提高可信度,建模采用了不同频率下的多组实验数据,因此该模型具有相对广泛的适用性。更多还原

【Abstract】 The test equipment for two-freedom dynamic testing is developed in the NH-2 low-speed wind tunnel at Nanjing University of Aeronautics and Astronautics.The large amplitude motion test about a fighter model is carried out by using this equipment.Firstly,the wavelet analysis and the model of nonlinearity step-index function are introduced simply.Then,to study the modeling for aerodynamic forces,the wavelet is applied to the model of nonlinearity step-index function.The sample data come from the experiment of the large amplitude motion about a fighter.The modeling uses many groups of experimental data at various frequencies.The modeling results are compared with the experimental data.The result proves that the model is credible and extensive.更多还原