Research On Control Strategy Of Cargo Door Actuation System Based On FPGA

With the development of multi-electrical technology,EMA(Electro-Mechanical Actuator)has become a new type of aircraft flight control and actuation equipment,and its application is increasing.In this paper,EMA technology is used in the CDAS(Cargo Door Actuation System).In order to reduce the power requirement of the system,improve the closing accuracy and the stability of cargo door operation,the control strategy of CDAS is studied.The paper completes the design of the system scheme,the establishment of the mathematical model of the CDAS,the establishment of Simulink simulation,the design of control strategy,the design of some FPGA program,experiment and analysis of the experiment results.Firstly,according to the actuating system of aircraft cabin door at home and abroad and the power supply scheme of the aircraft,four system implementation schemes are designed.According to the technical index of the system and the advantages and disadvantages of each scheme,the overall scheme of the system is established.The mathematical models of BLDCM(Brushless DC Motor)and cargo door load are established,and the overall simulation model of the system is established on Simulink platform.Then,the opening and closing speed curve is designed by load matching principle,and the speed curve is optimized by PVT interpolation algorithm,so that the speed curve is continuous and smooth.By analyzing the influence of load change on system performance,the advantages and disadvantages of traditional PID control,fuzzy PI control is selected.The control method can adjust PI parameters online and improve the adaptability of the system to load change.The fuzzy control query table is obtained by using MATLAB,and the PI parameters of the controller are adjusted online by FPGA.In addition,the FPGA program design of traditional PI control algorithm and fuzzy PI control algorithm is completed.Finally,the closing accuracy is experimented,the designed full stroke opening and closing speed curvesare simulated and experimented,the simulation and experiment of fuzzy PI control and traditional PI control are carried out.Then the simulation and experiment results show that the speed curve optimized can reduce the power requirement of the system,and the fuzzy PI control can effectively improve the stability of the cargo door operation.