Adaptive Optimal Control For Jet Pipe Electro-hydraulic Servo Valve

The control system is an indispensable part of the large-scale aero-engine,which ensures that the aero-engine can work safely and reliably,and provides thrust for the flight of the aero-plane.The jet pipe electro-hydraulic servo valve has become the most widely used component of the aero-engine control system due to its high anti-pollution ability.Therefore,we combine modern control theory with mechanical hydraulics,and design a high-precision control strategy to deeply analyze the performance of the valve,which has extremely important guiding significance for the improvement and optimization of the jet pipe valve.The main contents of the paper include:In this paper,a jet pipe valve in a certain type of engine control system is taken as the research object.Firstly,we deduce the theoretical model of the torque motor magnetic circuit of the valve,the armature-feedback lever assembly,and the jet pipe amplifier assembly of the valve.Then the simulation model of each component in AMESim is built,furthermore the simulation model of the valve is established.Finally,the simulation data is compared with the actual system motion data,which shows that the simulation model is correct and reliable.Based on adaptive dynamic programming(ADP)method,the optimal control of the jet pipe valve is studied.First,according to the transfer function of the jet pipe valve,appropriate state variables and control variables are selected to obtain its state space model.Then based on the adaptive dynamic programming technology,the Algebraic Riccati Equation is solved using the state of the jet pipe valve and online input information.Then the optimal control problem of jet pipe electro-hydraulic servo valve is solved.Finally,the simulation is carried out in MATLAB,by comparing with the PID algorithm,the effectiveness of the adaptive dynamic programming algorithm in the optimization control of the jet pipe valve is confirmed.There are also many hydraulic servo systems in aero-engine control system,among which the most common is the valve-controlled cylinder system,which is a typical nonlinear system with time-varying or uncertain parameters.Aiming at these uncertain factors,a nonlinear adaptive robust control strategy for the electro-hydraulic servo system is designed in this paper.Firstly,the nonlinear structure and working principle of the valve-controlled cylinder system are analyzed,and then the state space model of the system can be obtained.Then,the adaptive robust control strategy is adopted to transform the controller design problem of an electro-hydraulic servo system into the design problem of multiple Lyapunovfunctions with error variables.Finally,the simulation results show that the control method has advantages of good control effect,simple structure and strong robustness.