Modeling And Simulation Of Turbofan Engine Control System

As one of the most intelligent industrial crystallization,aero engine has the characteristics of complex structure,long R&D cycle and high development cost.The control system is an important part of the aero engine,ensuring the safe and stable operation of the engine in the wide flight envelope.Designing a reliable and stable controller to make the engine run stably and efficiently under different flight conditions has become a top priority in the design of aero engine systems.As a new type of control method,Active Disturbance Rejection Control(ADRC)has a simple structure,few parameters to be adjusted,and can effectively estimate system disturbance in real time.It is an algorithm for engineering applications.This paper studies the design of turbofan engine control system and proposes to design the engine control system with Linear ADRC(LADRC).Firstly,this paper introduces the principle,modeling method and calculation process of engine component-level modeling and verifies the validity of the model by simulation.Then,a linear model is derived around the steady-state operating point of the engine component-level model by the partial derivative method.Secondly,this paper designs the first-order linear Active Disturbance Control(FOLADRC)system for turbofan engine.By comparing the schematic of FOLADRC with the PI controller’s schematic,it is found that FOLADRC can be regarded as a PI controller add a low-pass filter block and a pre-filter block,which makes FOLADRC better than PI control in resisting high frequency noise and decreasing system overshoot.Through simulation of the CMAPSS-1 90k turbofan engine model released by NASA,one FOLADRC controller can replace 14 PI controllers to control the engine with stability effect,non-overshoot and quicker response speed under 14 flight conditions.Finally,this paper introduces the thermodynamic modeling software package TMATS released by NASA.Based on the JT9D component-level model in T-MATS,the traditional N-dot controller with PI form improved and connected with the steady state controller to design a FOLADRC form transition state control system.Simulation shows that FOLADRC can control the acceleration and deceleration of the engine smoothly without overshooting within the safe operating range of the engine.