大振幅实验对常规动导数实验包容性研究

某飞机模型在南京航空航天大学NH-2低速风洞中进行大振幅振动动态试验.模型绕通过重心的机体坐标轴分别作单独俯仰、偏航、滚转的大振幅振动,采用内式应变天平测量模型的非定常空气动力.通过非定常空气动力建模和动导数仿真方法,获得模型的纵横向稳定性导数和交叉导数.仿真结果与常规动导数试验结果比较,两者在量级和规律上一致.分析表明,模型大振幅振动实验结果包含了常规动导数实验的信息,模型的动导数可以从大振幅振动实验结果中获取.

Investigation on contain of the large amplitude test to the general dynamic derivative test

The large amplitude oscillation of model test was carried out in the NH-2 wind tunnel at Nanjing University of Aeronautics and Astronautics.The model pitched or yawed or rolled around the body coordinate axes across the center of gravity of the model and the unsteady aerodynamic were measured by an inner strain balance.Using the unsteady aerodynamic model and the simulation of dynamic derivative,the stability dynamic derivative and the crossed dynamic derivative were obtained.Compared the results of simulation with the results of general dynamic derivative test,the two results were consistent in grade and rule.It is indicted that the results of large amplitude oscillation test contain the information of the results of general dynamic derivative test and the dynamic derivative of the model can be obtained from the large amplitude oscillation test.