定量反馈理论在鲁棒与容错飞行控制系统中的应用

Application of QFT in Robust/Fault Tolerant Flight Control Systems Design

定量反馈理论 ( Quantitative feedback theory,QFT)作为一种新颖的频率域鲁棒控制技术 ,综合考虑了对象的不确定性范围和对系统的性能指标要求 ,以定量方式在 Nichols图上展开分析与设计 ,从而保证了设计结果具有稳定鲁棒性和性能鲁棒性。而当飞机控制舵面局部受损或失效时 ,飞机模型气动导数所受的影响可看作是不确定对象鲁棒性问题的扩展 ,因此 ,考虑舵面受损与失效时的容错飞行控制系统也可用 QFT方法进行分析与设计。本文在讨论 QFT原理与设计方法的基础上 ,以某型无人驾驶飞机的纵向飞行控制系统为例 ,对鲁棒和容错飞行控制技术进行了分析、研究与设计 。

The quantitative feedback theory (QFT),a new frequency domain based robust control approach design, takes account of both the scope of the plant′s uncertainty and performance requirements to the system by the way of designing on the Nichols chart. So it can ensure that design results have stability robustness and performance robustness. The influence of control surface loss or damage on the dynamic derivatives of the aircraft model can be treated as an extension of the model uncertainty robustness problem. QFT is applied to the analysis and design of the fault tolerant flight control system allowing for possible control surface damages. In this paper, the QFT approach is used in the analysis and design of robust /fault tolerant flight control systems for a remote pilotless vehicle. Design results and simulational tests reveal the bright potential applications of QFT approach in the robust/fault tolerant flight control system design.