The Design And Implementation Of The Shaft Power Online Measuring System Based On Optical Fiber Sensing

In order to speed up the transformation of the mode of economic development and take a new road to industrialization,Ministry issued < Chinese manufacturing 2025> program for the development making it clear to accelerate the development of the marine engineering equipment and high technology of ship as one of the ten major focus areas of development.In this paper,we design an online measurement system of shaft power based on the fiber optic sensing technology.The research content of this paper includes main aspects as follows: First,This paper introduces the research status of the speed measurement,torque measurement and optical fiber sensing technology at home and abroad.By comparing the advantages and disadvantages of various optical fiber sensing technology for measuring torque,the fiber grating method based on wavelength modulation is determined.Second,we complete the structure and hardware design of the shaft power measurement system.Aiming at the key problems such as the temperature compensation of fiber grating for measuring shaft torque,sticking method and non contact measurement method,we propose the solutions based on MATLAB.The hardware design of rotational speed measurement based on STM32 is completed.Third,we complete the software development of the online measuring system of shaft power.Taking into account the future of the problem,the wavelength data acquisition software and monitoring software are designed separately.Wavelength data acquisition software is designed based on C#.We achieve the shaft speed,torque and power data real-time monitoring display,storage and query functions by LabVIEW.At last,The ideal angle of fiber Bragg grating is verified by the experiment.The torque sensitivity is 7.845pm/nm after setting up the reference grating,the nonlinear error of the loading and unloading travel is 1.48% and 2% respectively,the hysteresis error is 0.7%,and the repeatability error is 1.06%.It shows that the torque sensing system can well meet the application requirements.