Research On Multivariable Robust Control Of Aero-engine Based On Optimised Control Structure

Multivariable robust control is the developing trend of aero-engine control. Along with the increasing of the number of engine's adjustable variables and controlled variables, how to select the better controlled variables and how to design the control configuaration of the engine have become crucial problems in engine's control. This dissertation decomposed the aero-engine control system designing into three steps: controlled variables selection and control configuration design, multivariable robust controller design, and engineering implement of the controller. And this dissertation also studied the method of building aero-engine's adaptive model.The research of this dissertation begins with the component-level modeling of areo-engine. In the basis of the existing component-level model, this dissertation added a new module which can reflect the influence of guide vane to the aero-engine. And adaptive modeling method also studied in this dissertation. A new adaptive modeling method which modeling the adaptive model based on err-feedback control was presented.And then, the controlled variabes selection and control structure design was studied based on the aero-engine model. The controlled variables of aero-engine's three-variable control systes and four-variable control systes were selected by controlled variables selection method which is called RSCN (Robust Stability & Conditon Number). And then design the control structure by two methods: Relative Gain Array (RGA) & Block Relative Gain (BRG) and Relative Interaction Decomposition (RID).In chaper 4, Augmented LQR (ALQR) controller design method and H₂/H_∞controller design methed based on Linear Matrix Inequality (LMI) were studied; The dynamic performance of H₂/H_∞controller based on LMI was optimized by genetic algorithm. By converting the loop coupling of the controlled plant to H_∞performance index, a new controller design method,H₂/H_∞decoupling controller design methed based on LMI, was presented. And then, engineering implement of the controller was researched, includes anti-windup, anti-afterburner disturbance and transform the float controller to integer controller. And simulations were conducted to verify these methods.