Design And Implementation Of A Test Bench For Magnetic-Electric Aviation Speed Sensor

With the advancement of AIG’s strategic guidelines for building a strong aviation nation in the new era,major progress has been made in major special projects such as "big aircraft" and "two aircraft"(aero-engine and gas turbine),and the aero-engine is an important component of the aircraft.The rotational speed sensor(tacho sensor)is one of the most important parameters to evaluate the performance of aero engines.Based on this background,this paper designs and implements a magneto-electric aero rotational speed sensor rotational speed test bench(rotational speed test bench).In this thesis,from the current situation of domestic and international research on the technology related to tacho test bench,the test functions and technical requirements of tacho test bench are described,and the overall block diagram of tacho test bench is designed according to the principle of sensor detection.Its main research contents include the following aspects:(1)A variable-domain double-closed-loop fuzzy PI permanent magnet synchronous motor vector control(FOC)method based on modified particle swarm(PSO)optimization is designed.Compared with the fuzzy PI controller,it improves the fast response of the current following the given voltage in the starting phase and the dynamic stability and anti-disturbance of the speed in the constant speed phase,and suppresses the overshoot.(2)Built the hardware circuit of the tacho test bench,including: the design of STM32 minimum system and peripheral circuits(power supply circuit,touch screen control and display circuit,bus voltage and temperature detection circuit)and the design of motor driving circuit(six-bridge arm driving three-resistance current sampling circuit,Hall sampling circuit,current amplification isolation circuit).The hardware foundation of the tacho test bench was realized.(3)The experimental platform is divided into hardware driver layer,functional module layer,operating system layer and application layer with the idea of hierarchical structure to realize the software infrastructure framework of the testbed.At the same time,each layer is designed for pervasiveness,which greatly improves the portability of the system among different platforms.(4)The embedded real-time operating systemμ C/OS-III is used for the application layer to prioritize tasks subdivided into instruction processing tasks,touch screen manipulation and display tasks,upper computer monitoring tasks,and temperature and voltage detection tasks,and to schedule tasks according to the priority.It ensures the timely execution of high priority tasks and improves the real-time performance of the system.This thesis finally verifies the correctness of the system in the tacho testing process through hardware circuit test,software test and system technical index test.The test results show that the designed magneto-electric aero tacho sensor tacho test bench improves motor control accuracy,increases motor motion stability,visualizes motor status,improves data processing efficiency,and meets the technical index and functional requirements of the magneto-electric aero tacho sensor test tacho.