选择变稳飞机拟配参数的一种新方法

On Selecting Quasi-Assignment Parameters for Chinese Variable-Stability Aircraft

研究了在响应反馈模态下，如何选取变稳飞机的拟配参数问题．首先，利用特征值灵敏度方法来修正变稳飞机的状态反馈增益值，将变稳飞机的主导极点尽量配置得与模型飞机相同；然后利用对消方法将变稳飞机未配准的主导极点配准；最后用对消或引入交链信号的方法使变稳飞机的主要响应特性与模型飞机逼过．

As advanced trainers are not available to P. R. China on the world market, it is necessary to develop such trainers to meet the urgent need of China's rapidly developing air transportation. We now present our research on variable- stability, which is indispensable to an advanced trainer.In order to achieve the desired variable- stability, we make use of three well known methods: eigenvalue sensitivity, zero- pole cancellation, and introduction of coupling signals. We combine these methods in such a way as to facilitate the selection of quasinssignment parameters of variable- stability aircraft for response feedback mode. Only for eigenvalue sensitivity method is there the necessity for us to derive eqs. (1) through (3), which are needed for adjusting feedback gains of variable- stability aircraft so as to position its dominant poles to approach very nearly those of model aircraft. We so used zero- cancellation and the method of introduction of coupling signals as to make main response characteristics approach those of model aircraft.We apply our method to a specific model aircraft. Fig. 2 does show that our methodsucceed in obtaining dynamic responses of variable- stability aircraft that are fairly close to those of the specific model aircraft.FInancial support for our research comes from an aeronautical research institute, which accepts our results as a sound basis for further research.