Design And Realization Of Propeller Torque Experiment Platform

In recent years,with the development of national scientific and technological innovation,drones have become more and more widely used in the field of agriculture.The propeller is an important component that provides lift for the plant protection drone,which has a significant impact on the performance of the plant protection drone.The torque,lift,and speed of the propeller are important parameters that reflect the propeller performance.Therefore,the propeller shaft torque is accurately measured and displayed in real time.Propeller lift and propeller speed have become an important issue in the field of plant protection UAVs.This paper designs a set of STM32 microcontroller as the core,which can measure the shaft torque,propeller lift and propeller speed in real time,and can send the measured experimental data to the receiving device wirelessly.At the same time,it can also communicate with Lab VIEW through serial port and obtain the measurement.The experimental data of the propeller test bench is displayed on the virtual instrument and can monitor its variation.This system can display the data on the receiving device or the virtual instrument through the wireless device,mainly for the convenience of the operator to observe the experimental data in the remote handheld device during the experiment.The experimental platform can accurately and conveniently measure the actual values of individual propeller shaft torque,propeller lift and propeller speed.It can be used as an important R&D platform for plant protection drones and provides important data support for the development of plant protection drones.The thesis first introduces the selection of torque sensor,speed sensor,pressure sensor and wireless transmission module and the principle of torque,lift and speed measurement.The overall circuit diagram is designed according to the experimental requirements,including strain gauge sensor measurement circuit,speed measurement circuit,power supply Circuit,reset circuit,SPI FLASH circuit and wireless transmission module circuit,and complete the line connection between various hardware.At the same time,in order to ensure the accuracy and reliability of the experimental data,the torque and lift are used for calibration experiments with weights one by one,and linear regression analysis is performed,and the measured linear regression coefficients are substituted into the program to reduce errors.Secondly,the software design of the experimental platform is introduced,including torque measurement module program,speed measurement module program,pressure measurement module program,wireless transmission module program and serial communication module program,among which torque measurement module program,speed measurement module program,pressure measurement module program And wireless transmission module program is completed in keil 5 using C language programming,and serial communication module program is completed in graphical programming language on Lab VIEW 8.6.Finally,the measured experimental data is polynomially fitted on Lab VIEW to obtain three curves of time-speed,time-torque and time-lift,analyze and predict its law,and provide data support for the control of the propeller experimental platform.In this experiment,the lower computer and the upper computer are programmed on keil5 and Lab VIEW 8.6 respectively.The lower computer adopts stm32f103ZET6 as the single chip microcomputer of the MCU,which mainly measures the propeller speed,propeller lift and propeller shaft torque and completes the communication with the host computer.The lower computer is mainly to perform polynomial fitting on the measured experimental data on the Lab VIEW through the principle of least squares,to obtain the fitting curve,analyze the rule of the three curves,realize the monitoring and prediction of the propeller experimental platform,and complete the human-computer interaction.