Design And Research Of Civil Aircraft Engine Thrust Reverser System Based On Power By Wire Actuation

Fast braking mainly depends on the reverse thrust provided by the cascade thruster when large and medium sized civil aircraft landing at full load.In order to replace the traditional hydraulic actuation and solve the problems of low hydraulic actuation reliability,low energy utilization rate and high fuel consumption rate,this thesis designs an electric reverser thrust system based on PBW actuators technology.First,an overall analysis of the electric thrust reverser system is carried out from the requirements and airworthiness regulations to determine the requirements to be satisfied by the electric thrust reverser system;The electric thrust reversal system is designed from: the thrust reverser device,the electric thrust reverser actuation system and the electric thrust reverser control system.In order to obtain the motion resistance of the thrust reverser system,this thesis refers to the relevant research to carry out a numerical simulation of the flow field change during the deployment of the thrust reverser.The 3D model of the thrust reverser is established in Solid Works,and the field domain is extracted and meshed in ANSYS to verify the meshindependence.The CFD calculation is performed on the deployment process of the thrust reverser,and the aerodynamic load curve of the block doors is obtained,which provides numerical support for the simulation of the thrust reverser system.The kinematic mechanism of the thrust reverser is simplified to a crank-slider mechanism,and the kinematics and dynamics of the thrust reverser are analyzed and modeled: first,the kinematics mathematical model of the mechanism is established,and the kinematics mathematical model is initially simulated in Simulink.Then,the dynamic relationship between the block doors and the block door drag link rod is analyzed separately,and a mathematical model is established.Comparing the four motors,the brushless DC motor is selected as the actuating motor of the electric thrust reverser system,and the mathematical model of the brushless DC motor is established and simulated in Simulink.At the same time,the PID control and fuzzy PID of the brushless DC motor are compared and analyzed.It shows that the stability and accuracy of fuzzy PID control are more prominent,and it is more suitable for electric reverse thrust system.The overall model of the electric thrust reverser system is built in Simulink for simulation,and the results show that the design and simulation model in this thesis are correct.Finally,an electric thrust reverser system test platform is built,and a demonstration test is carried out.The test results are basically consistent with the simulation results.