用于飞控系统试飞验证的识别方法

为试飞验证飞控系统的稳定性，改进，确认控制律和评价飞机的飞行品质，提出了富氏系数法（ＦＣ），直接快速富氏变换－功率谱密度地（ＦＦＴ－ＰＳＤ）和相关函数为－功率谱密度法（ＣＦ－ＰＳＤ）确定系统频率响应，进而采用罗森布洛克无约束极值法和最小二乘－高斯牛顿迭代法进行模型参数拟合，另外，给出适合于上述方法的输入激励设计，通过用Ｔｕ－１５４Ｍ空中模拟试验机人机闭环／手动扫频试验数据和ＢＷ－１变稳机手动／自动

Identification Methods for Flight Test Verification of Flight Control System

In order to conduct the stability verification,control law updating and validation of control system and flying quality evaluation,several methods,including Fourier coefficient,power spectrum density based on fast Fourier transform or correlation function calculation,and several appropriate new designed excitation input signals are presented and applied to determine the system frequency responses.Further both the modified Rosenbrock search algorithm and the least squares Gauss Newton iterative procedure are used to extract parametric models by fitting frequency or time response.In addition,the effect of different methods and excitation signals are compared one other using manual and automatic sine sweep and air air tracking process data from Tu 154M in flight simulator and BW 1 variable stability aircraft flight test.Final results show that all methods are correct and the excitation signals are effective.They can be popularized in flight test of flying qualities and fly by wire flight control system.