再入滑翔飞行器控制系统鲁棒性能评估方法研究

Research on the Assessment Method of Robust Performance of Gliding Reentry Aircraft Control System

将μ分析方法应用到飞行控制律的评估中,以再入飞行器纵向模型及为其设计的PID控制器和LQR控制器为研究对象,针对参数不确定性建立线性分式变换(LFT)模型,基于不稳定特征值评估准则使用结构奇异值理论对模型进行分析,使用matlab的μ分析与综合工具箱得到的仿真结果表明,2种控制器均具有较好的鲁棒稳定性,满足鲁棒性能要求,并且得到了最坏情况的不确定参数组合。

The μ analysis method is applied to the clearance of flight control laws. The vehicle model used in the present research is a longitudinal gliding reentry vehicle, and the flight control laws are a PID con- troller and a LQR controller. By focusing on the parameters uncertainty, the linear fractional transforma- tion model is developed from the nonlinear aircraft mode. The tx analysis method is applied to evaluate an unstable -eigenvalue criterion. By using the IX analysis and synthesis toolbox, the stability robustness anal- ysis results for the flight control laws are presented and then the worst - case perturbation is computed. The simulation result shows that all two controllers achieve robust stability and robust performance requirements.