Multivariable Control For Turbofan Engine Based On Active Disturbance Rejection Control And Its Hardware Verification

Turbofan engines have been used so widely in both civil and military industries,which is an important manifestation of strategic emerging industries.Due to the harsh working environment,complex structure and high reliability requirements of turbofan engines,it is an urgent demand to design an advanced control system to meet the performance and safety requirements.An Active-Disturbance-Rejection-Control(ADRC)based multi-variable control system for full envelope control of turbofan engines is built,which is relies on the project “multivariable control and robust range optimization”.The main research contents include:To deal with the steady state control of turbofan engine,a linear steady state speed model of the turbofan engine is established through the system identification.Then a steady state speed control system based on active disturbance rejection control is designed.Simulation results show that in the case of turbofan engine performance degradation,the ADRC-based controller is significantly better than traditional one.And turbofan engine's transition state control is also considered.At first,a classic turbofan engine transition state speed control system based on the combination of gain scheduling PID and MIN-MAX control logic is designed,and the problems of the classic control method are analyzed.In order to improve the controller design efficiency,a turbofan engine transient state controller is designed based on the active disturbance rejection control.Moreover,an active disturbance rejection controller based on gain scheduling is proposed so as to take both transient state control performance and the steady state control performance of the turbofan engine into account.The simulation results show that the proposed method not only ensures the transient state control effect of the turbofan engine,but also improves the control accuracy of the steady state control.Then turbofan engine multivariable control is also discussed to improve turbofan engine performance as well.The effect of the control target and control quantity of the turbofan engine is firstly analyzed,and tail nozzle area and pressure ratio are designed to be the second set of control variables.Then,by studying the influence of the pressure ratio of the turbofan engine at different speeds on the thrust,the optimal control trajectory of turbofan engine pressure ratio is determined,and the particle swarm optimization algorithm is used to optimize the controller parameters.Finally,through the hardware-in-the-loop simulation platform based on the digital electronic controller,the real-time performance and accuracy of the proposed method are verified.The test results show that the proposed method can achieve stable speed control and pressure ratio control and improve the stability of turbofan engine thrust,which is valuable for the application of turbofan engine control.