The Design Of Low-power Measurement Device For The Integrated Measurement Of Power And Axial Force For Rotary Shaft

Structures with rotation shaft permeate the design of dynamical machinery and machining equipment and have long been the key component of dynamics transmission system.The working state of rotation shaft is a good indicator of system dynamic,stability and working efficiency.Demands for intelligent dynamical machinery and machining equipment have roared since the advent of Industry 4.0 and Chinese Intellectual Made.Precise measurement of the working state of rotation shaft counts a lot towards the meeting of the above-mentioned demands.On the one hand,it lays the foundation for precise close-loop control between power source and its attached actuator so as to assure the stable operation of the machinery,the reduction of power consumption and its working security.On the other,after accessing the Internet it can serve as a good information source for remote monitoring,intelligent operation based on cloud storage and optimization of manufacturing process based on big data analysis.This research project aims to design an integrated measurement device for the key working parameters of rotation shaft,namely rotary speed,torque and axial force so as to promote the upgradation of dynamical machinery and maching equipment in China.Firstly,a thorough analysis of the coupling relationship between torque and axial force of the rotation shaft in typical working conditions was performed and a method for decoupling was proposed after a comprehensive review of previous research on the same subject.A novel method for rotary speed measurement based on the merits of both pulse timing and pulse counting methods was proposed.The method is self-adaptive and could act as a solution to the problem of choosing a suitable method for rotary speed measurement.An ICPT based wireless solution was proposed for power supply of rotary shaft and the low-power design of the target board was also presented.A four-level hierarchical architecture,namely the Rotator(?)Stator(?)Server Web architecture,was proposed for the measurement,transmission,display and storage of power and axial force of rotary shaft.A nRF20L01 based wireless solution was proposed for the communication between ATmega MCU and the stator.In this solution,the ATmega MCU could adjust the configuration of DAC and digital potentiometer based on the received command,which makes the whole solution more adaptive.The board on rotator was driven by the rectified power supplied using ICPT.The STM32 MCU on stator achieved multi-thread processing using uC/OS-II real-time operating system.The nRF24L01 module on stator was also responsible for the receiving of torque and axial force measurement from rotator.The data was encoded using Manchester Encoding so as to reduce transmission error rate.The received data was transmitted to server after decoding.The software on server was developed using C#,the power of the rotation shaft was calculated based on torque and rotary speed then displayed on software GUI.After that the calculated value was written into backend database.Besides data storage,the backend database also serves as the data source for web-based real-time monitoring.At last,various experiments for verification in simulated environment were proposed for power consumption analysis,wireless power supply testing,torque measurement calibration and rotary speed measurement of the system.Experimental results showed that the system does have the required precision and is competent for low-power integrated measurement of power and axial force for rotary shaft.