飞机稳定裕度试飞评估及激励信号优化

摘要

The method for flight control sytem evaluating at present in flight test has been introduced.Fast Fourier transform was used in the quasi-realtime processing of flight test data,according to the stability flight test request on the real time and accuracy,the infection of excitation signal on the identification result was analyzed.Excitation signal base on mixed frequency was employed which largely reduced excitation time with guarantee of accuracy.Also the oscillation of phase appears in the high-frequency is eliminated by the control with disperse frequency step,which is help to flight data processing and also lightenes the operation weight of pilots.%介绍了目前飞行试验对飞行控制系统的评估方法.依据稳定裕度试飞对实时性和精确性的要求,采用快速傅里叶变换对试飞数据进行准实时处理,分析了激励信号对于辨识结果的影响.采用混频激励的方法,在保证精度的前提下,大大减少了激励所需的时间.并且,通过控制离散频率步长消除了高频段出现的剧烈相位震荡,有助于减轻试飞数据处理的负担和飞行员的操作负担.