Research Of Aircraft Active Side-stick Control System Based On Dual Redundancy BLDCM

Active Side-stick System(ASS)is the control device used by pilots to drive the aircraft.It is a command input product and a crucial type of airborne product of an airplane.and its reliability and control performance directly affect the safety and control quality of the aircraft.In order to meet the functional requirements of the ASS,this paper studies the reliability of the ASS when using single or dual redundancy BLDCM.The dual redundancy BLDCM control system and its application in the active pole system are deeply studied,and a control system based on DSP is designed.The simulation of the motor speed and the position of the ASS is carried out,the hardware circuit is designed,the software program is written to realize the control of the motor,the principle prototype is built,and the performance test is carried out to verify the feasibility of the control method.The main contents of this paper are as follows:Firstly,in order to further analyze the influence of the dual-redundant motor on the reliability of the driving rod system,this paper uses the GO-FLOW method to establish the reliability analysis model of the driving rod system.Based on the calculation results,the necessity of selecting the dual redundant motor is proved.After the type of motor is determined,this paper studies the structure characteristics and working principle of the dual redundancy BLDCM,and establishes the mathematical model of the motor.Secondly,based on the principle of PI control and fuzzy control,according to the characteristics of the aircraft driving rod system,the fuzzy PI control method is proposed to control the motor.Based on MATLAB / Simulink,the simulation model of double redundancy BLDCM and the position servo simulation model of the driving rod system are established.Thereafter,the speed module is simulated and analyzed by using traditional PI control and fuzzy PI control respectively.The response curves of speed,load and position of the two control methods under normal conditions,speed changes and load changes are compared.The simulation results show that the fuzzy PI control can show better static and dynamic performance.Thirdly,on the basis of theory and simulation,this paper takes DSP chip TMS320F28335 controller as the core to design the hardware and software of the dual redundancy BLDCM control system.Among them,the hardware design part includes the main circuit,Hall signal processing circuit,current and voltage detection circuit design.The software design part mainly uses the C language to write the motor control program in the CCS platform,which uses the main program and the interrupt service program to cooperate with each other,and completes the motor start,motor commutation,speed calculation,speed fuzzy PI control and current PI control functions.Finally,this paper designs the upper computer detection software for the motor of the driving rod system,and carries out the motor speed test,position servo test and position following test on the prototype.The test results show the rationality and reliability of the motor control system designed in this paper.It is also found that fuzzy PI control has better performance than traditional PI control.The test results show the rationality and reliability of the motor control system designed in this paper,and it has good speed regulation characteristics.When it is applied to the ASS,it can ensure accurate position control,and can meet the functional requirements of the ASS.The research results of this paper can provide a theoretical basis for the selection of the driving motor of the ASS.