Measurement Accuracy Research And Engineering Application Of Fiber Optic Gyro Monitoring System

Two important safety monitoring items for face rockfill dams are face plate deflection and dam body settlement.As a new type of monitoring equipment,the fiber optic gyroscope system realizes distributed measurement,and can continuously upgrade the hardware and software of the instrument to improve its measurement accuracy.However,due to the linear acceleration of the traction system itself,there is a certain error between the system’s calculated speed and the real speed.In addition,the change of the air pressure of the environment during the monitoring process of the fiber optic gyroscope monitoring system will also make the zero bias stability of the fiber optic gyroscope worse,causing errors during monitoring.Therefore,how to eliminate the influence of traction speed and environmental pressure changes on the measurement accuracy of the fiber optic gyro monitoring system and further improve the accuracy of the monitoring system remains to be solved.In addition,how the monitoring system can solve the problem of working under water is also a concern in the engineering community.Further research and solve.This article will focus on the impact of the fiber optic gyro monitoring system’s traction speed and air pressure changes on the measurement accuracy of the fiber optic gyro monitoring system,as well as the design and assembly of the submersible fiber optic gyro monitoring system;and the fiber optic gyro monitoring system in the high face rockfill dam-Jiang A series of research and analysis were carried out on the application in Jiang Pinghe Dam project.First,The influence of the traction speed of the fiber optic gyroscope monitoring system on the measurement accuracy,and the influence of the pressure change on the output of the fiber optic gyroscope and the stability of the bias are analyzed.Second,The Kalman filter fusion algorithm based on loose combination is proposed as a new speed update algorithm for fiber optic gyroscope system,and it is verified by experiments.Experiments show that compared with the traditional speed update algorithm,the new update algorithm model can effectively improve the measurement accuracy of the monitoring system,and has certain engineering practicability.Third,Experimental research on the influence of air pressure changes on the stability of the zero-bias of the fiber optic gyroscope monitoring system,collecting experimental data,and proposing a pressure drift error compensation model based on polynomial fitting.The model is applied to the analysis of measurement data,and the results show that the model can reduce the influence of air pressure on the stability of the bias to a certain extent,and improve the measurement accuracy.Fourth,the hardware of the fiber optic gyroscope monitoring system: In order to realize the underwater monitoring of the fiber optic gyroscope monitoring system,a submersible fiber optic gyroscope monitoring system is designed,and air tightness and water pressure resistance experiments are carried out.The experiment shows that the submersible fiber optic gyroscope The monitoring system can realize underwater monitoring.In addition,data processing software is developed using Lab VIEW programming platform and MATLAB programming language to realize monitoring data processing software with functions such as data acquisition,data filtering,inclination calculation,and chart drawing.Fifth,Apply the fiber optic gyro monitoring system to monitor the deflection of the Jiangpinghe face rockfill dam,and analyze the monitoring results of the second stage of the Jiangpinghe dam’s impoundment period.The monitoring results of the 0+005.0 section showed that the deflection and deformation of the longest section of the slab did not appear abnormal,which conformed to the basic deformation law,and the Jiangpinghe Dam was safe to operate during the impoundment period.