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。
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.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2010年第4期407-410,共4页
Journal of Nanjing University of Aeronautics & Astronautics
关键词
风洞实验
非定常空气动力
气动力建模
小波
wind tunnel test
unsteady aerodynamic
aerodynamic modeling
wavelet
