飞行控制系统鲁棒性分析

ROBUSTNESS ANALYSIS OF FLIGHT CONTROL SYSTEM BY USING RETURN DIFFERENCE MATRIX

简要叙述了特征结构配置及奇异振动法，介绍了用系统回差矩阵奇异值计算各回路幅值裕量、相位裕量的稳定变化范围。最后以某飞机纵向小扰动运动为例，设计了直接力控制律，分析了两种设计方法所设计的控制系统鲁棒性，展示了上述方法的应用。

Based on the achievements of previous works,the following problems areincluded in this paper.Abrief introduction of eigenstructure assignment method andsingular perturbation method of flight control system design is given. It introduces mini-mum singular value of return difference matrix to calculate stability margin of closedloop system. Finally,one design example of direct lift control is presented to illustratedabove method.