Study Of Aeroenigine Mathmatic Model And Control Law

For the broad range of the exterior condition and interior parameters of aeroengine and the restrictive of pneumatic and intensity, it is necessary to have the control strategy to satisfy the demands of aeroengine. Aeroengine mathematical model is the basic of simulation, which is the foundation of analyzing the characteristic and studying the control law, and also the condition of design of aeroengine control system and integrated flight and propulsion control system.In this thesis, through deeply analyzing to the characteristic and thermal calculation process of aeroengine components, nonlinear mathematical model of the aeroengine is established. The model has good quality of high precisions and broad applicability. The model can calculate steady and dynamic processes under variable control laws, and can be used to study MIMO control of aeroengine.Variable aeroengine control strategies have the variable forms of aeroengine matematical model. Aeroengine LPV gain-scheduling control techniques are based on the LPV model. Based nonlinear mathematical model of aeroengine, this thesis describes the LPV system and studies two techniques of LPV modeling, Jacobian technique and velocity-based technique.This thesis analyses the work condition and use demands of aeroengine, how to choose the control parameters and controlled parameters, then describes the basic principle of selecting control law. At last, several control laws are simulated through the nonlinear model.The conclusion is that the aeroengine mathematical model is practical and can be the basic of the engine control research. A quasi-LPV model of a turbofan engine is constructed and simulated over dynamic process. It indicates the availability of the methods of LPV modeling. The study of control law has the reference value for aeroengine control system.