基于参数辨识的水配重重心调配系统验证方法研究

水配重重心调配系统可实现飞机重心的快速调节,完成试飞科目中对重心的要求。本文以国内某型飞机为例,根据罐内水量的分布计算飞机相应状态的惯性数据,并在此基础上,进行气动特性建模及参数辨识,得到飞机的气动导数。通过公式推导,利用辨识得到的气动导数计算出不同重心的增量,与水配重系统的理论值进行对比。计算结果表明,参数辨识方法的重心增量计算结果准确度高,可以作为一种检验水配重系统工作是否正常的有效手段,进而保证飞机试飞的安全。

Research on Validation Method of Water Weight System Based on Parameter Identification

Water weight system can realize the rapid adjustment of the center of gravity of aircraft to meet the requirements of the center of gravity in flight tests.Taking a certain aircraft as an example,the inertia data of the aircraft is calculated according to the water distribution in the tank,the parameters are identified,and the aerodynamic derivatives are obtained.Through the derivation of the formula,the identified aerodynamic derivatives are used to calculate the increment of different gravity centers.The results show that the gravity center increment calculation result based on parameter identification method has high accuracy,which can be used as an effective method to test whether the water weight system works normally,thus ensuring the safety of the aircraft.