基于试飞数据的直升机气动模型参数频域辨识

Identification of Helicopter Aerodynamic Model Parameters Through Frequency Method Using Flight Test Data

针对直升机气动强耦合、强非线性、不稳定的特点,采用扫频方式获取飞行试验数据及频域辨识技术进行其气动模型辨识。首先分析了气动辨识模型、飞行试验数据需求,并对飞行试验动作进行设计,然后形成气动模型频域辨识流程。在纵向气动模型辨识过程中,发现扫频飞行试验数据低频、高频段数据质量差,纵向和横向通道舵偏相关性强等问题。

For the strong coupling, strong nonlinearity and instability of helicopter, the frequency sweep way was used to obtain the flight test data, and the frequency domain identification technique was used for aerodynamic model identification. This paper analyzed the model of aerodynamic identification and requirements for flight test data, and design the motion of flight test. Finally, the process of frequency domain identification of aerodynamic model was formed. In the identification process of longitudinal aerodynamic models, it found that the data quality of low frequency and high frequency was poor, and the correlation between longitudinal and lateral channe/rudder deflection was strong.