获取飞控系统频率特性的简捷方法

THE CALCULATION METHOD OF THE FREQUENCY CHARACTERISTIC OF AIRCRAFT FLYING CONTROL SYSTEM

介绍了采用离散傅立叶变换及其快速傅立叶变换算法逼近连续信号频谱时的基本原理和误差，计算结果表明用快速傅立叶变换可以较准确地获取一、二阶环节和飞机飞控组合系统的开环幅相频率特性，并对用快速傅立叶变换求出的各种飞行试验扰动信号的频谱进行了对比分析。

This paper introduces the basic principles and errors to approximate thefrequency spectrum of the continuous signals using Discrete Fourier Transform and FastFourier Transform, it proves that the opened-loop amplitude and phase frequencycharacteristic of first and second circuit and Aircraft Flying Control System,the frequencyspectrum of all kinds of the flight test turbulent signals are calculated and the comparisonsare made between them.