基于时域数据的两种低阶等效拟配方法研究

基于时域数据,对两种低阶等效拟配方法—频域等效拟配法和时域等效拟配法进行了研究.首先阐述了时域数据的两种来源,并对飞行试验数据中的关键参数给出了修正公式.以某型飞机为例,以两种输入形式进行了飞行动力学仿真,将得到的时域数据进行了低阶等效拟配.两种低阶等效拟配方法的结果和理论值吻合,且低阶等效系统仿真结果和原始时域数据重合度很高,表明方法合理有效.并根据操纵输入形式对辨识结果的影响对操纵输入的选取提出了要求.

Study on the Two Kinds of Matching Methods of Low Order Equivalent System Based on Time-domain Data

Two kinds of matching methods of low order equivalent system were studied based on time-domain data. First of all, two source of time-domain data were described and correction formula for the key data of flight test were given. Then, flight simulation of a specific aircraft was conducted using two types of control inputs. The simulation data were used for equivalent matching. The short period mode results of matching coincide with those of theoretical data. Besides, the simulation results of low order equivalent system quite match original time-domain data. These indicated the matching methods were workable and valuable. Finally, according to the influence of control inputs on matching results, some suggestions of how to choose control inputs were given.