Longitudinal frequency-domain equivalent matching method for flight control system based on short time Fourier transform
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摘要: 基于短时傅里叶变换(STFT, Short Time Fourier Transform)方法,进行飞控系统时域数据纵向频域等效系统的拟配研究.对系统的输入信号,运用STFT方法进行分解,得到驾驶员敏感的频带内的信号.利用快速傅里叶变换(FFT, Fast Fourier Transform)求取输入输出信号的频谱,由频谱导出系统的频率响应函数,并将其用于低阶等效系统拟配,得到低阶系统参数.这种方法提高了高低阶系统等效拟配的拟配效率,减小了拟配误差,改善了飞行品质的评估结果.Abstract: Based on short time Fourier transform(STFT), a study was carried out on longitudinal frequency-domain equivalent matching for time-domain data in flight control system. The input signals of the system were first decomposed by STFT to achieve those signals that most interest the pilots. Then fast Fourier transform(FFT) was used to extract the frequency spectrums of both input and output signals. From the achieved frequency spectrums, the response function was derived and was applied in the low-order equivalent matching to obtain the parameters of low-order system. This method increases the matching efficiency of both high-order and low-order systems, reduces the matching error and improves the evaluation results of flying qualities.
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