Research On Aero-engine Control Based On LPV Model

As an aero-engine is a complicated thermo-mechanical system with strong nonlinear dynamic characteristic,the features of object have great changes in different working condition.In single nominal point,robust controller is very difficult to ensure the engine with good performance under various working conditions.With the development of aero-engine,the aero-engine becomes more and more complex.Many more parameters need be controller.Therefore,in this thesis a linear time-varying parameter model(LPV)of the aero-engine modeling is established.The different controller is called by using the LPV model with time-varying gain parameter.This dissertation decomposed the aero-engine's LPV model,feedback controller design based on parameter dependent Lyapunov function and LPV feed-forward controller design.Firstly,in this thesis the model of aero-engine can be expressed as linear parameter varying(LPV)model.Then the model is transformed into convex polytopic model.Secondly,based on LPV model of aviation engine,according to parameter dependent Lyapunov function,the robust variable gain controller is designed.Linear matrix inequality(LMI)approach is applied in this article.Designed feedback controller satisfies the parameter dependent Lyapunov function theory for each vertex of multiple cell models.So the aero-engine LPV model and LMI convex constrained optimization problem is a significant and meaningful work.Thirdly,in this text,against the LPV system with disturbance,under the condition that the feedback control ensure the stable conditions,using the theory of control,a LPV feed-forward controller is designed to reduce the tracking error and disturbance rejection meaning to improve the dynamic performance of this system.Finally,the thesis builds the simulation model and program based on the Matlab environment,the simulation verify the validity of the design method.Simulation results demonstrate that in the presence of a perturbation,the controller could make the system track the command signal exactly with certain robustness.With external disturbance,the control system is a good way to restrain disturbance.Finally,this thesis summarizes the main work and points out the shortages of the research question together with the perspective of future study.