Research On Robust H_∞Control For Aero-Engine Distributed Control System

Aero-engine distributed control system has great advantages compared with traditional centralizedcontrol system. It can reduce the weight of the control system, improve reliability and maintainability,shorten the development cycle, reduce costs and adapt to changes with new technologies. Themodeling, robust control method and robust control for network-based time delay for distributedcontrol system of aero-engine is researched in this thesis.Based on the idea of decentralized control, the distributed control system model is established andits subsystems state-space models are constructed with satisfactory accuracy compared with thenonlinear model.The speed control system without time-delay is designed with the state feedback controller andH control strategy. In order to eliminate the tracking error of the system, robust control algorithmhas been improved using augmented system andH2/H control method. Simulation results show thatthe system can effectively eliminate the steady-state error.For direct thrust control subsystem, a dynamic output feedback controller is designed and the existcondition is given at steady-state point to meet the requirements of dynamic output feedbackcontroller. Output feedback controller is designed at a number of points in the flight envelope.Thesimulation results show the effectiveness of the design.The control method of a distributed control system with a network based time-delay is Studied. Thesolution for the controller gain parameter depends on a set of linear matrix inequalities (LMI) and thenetwork based time delay has a direct impact on the results of the group of linear matrix inequalities.The state feedback control of augmented speed control subsystem is designed with delay robustness,and elimination of the steady state error.