Research On The Decentralized Robust Control Design For Aero-Engines

Considering decentralized control problem,time delay problem,uncertainty problem and gain scheduling problem in the aircraft engine distributed control system,we explore aircraft engine decentralized robust control method.The decentralized robust controller is designed.The proposed controller can guarantee the closed-loop system asymptotic stability or uniform boundedness,ultimate uniform boundedness,and robustness for aircraft engine distributed control system which contains time delay and uncertainty.By the small perturbation method and the least square fitting algorithm,the aircraft engine linear model near a steady point is extracted from the aircraft engine component-level model.The aircraft engine uncertain large-scale system model and the closed-loop uncertain large-scale model with transmission delay are extracted from the aircraft engine linear model.These three models are basic of dencentralized control design.By construted functional observer,the decentralized control which is equivalent to centralized control is designed.Considering an uncertain large-scale system with matching conditions,a fractional type decentralized controller is proposed which guarantees the closed system is uniform boundedness and ultimate uniform boundedness.Considering an uncertain large-scale system without matching conditions,a stability theorem which is described by LMI is proposed by taking advantage of Lyapunov method.The Parameter Adjustment Method and the Progressive Method are proposed.Based on these two mehods,the aircraft engine large-scale gain scheduling controller in full envelope is constructed.Considering an uncertain large-scale system with transmission delay,by choosing a satisfied Lyapunov-Krasovskii functional(LKF)which contains integral and dual integral,taking advantage of inequality contraction,introducing free-weighting matrices,making use of Schur lemma,an optimal guaranteed cost controller is developed.Based on aircraft engine semi-physical simulation system,the hardware-in-loop(HIL)simulation and semi-physical simulation of gain scheduling control(GSC)in full envelope for the aircraft engine large-scale system are proceed.The simulation results show that the controller can guarantee the robustness,real-time request of controlled system under the real controller,actuators and sensors.