Research On Dam Deformation Measurement Method Based On Fiber Optic Gyroscope

At this stage,the steady development of China’s water conservancy business has built more dams,which has brought huge social and economic benefits,as well as inevitable risks and hidden dangers.To ensure the long-term safe operation of the dam,dam safety monitoring is becoming increasingly important.Deformation monitoring can best reflect the operational status of the dam and is the primary item in dam safety monitoring.Traditional measurement methods are increasingly difficult to meet the requirements for dam safety monitoring.In order to solve the problems of discontinuous and low lifespan of traditional measuring instruments and the increase of measurement error caused by carrier vibration and drift of fiber optic gyroscope,a measurement method combining fiber optic gyroscope and odometer is proposed.First,the principle,advantages and disadvantages of single-axis fiber optic gyroscope are introduced,and the three-axis fiber optic gyroscope measurement method is proposed,which leads to the core components and hardware facilities.The core components are three-axis fiber optic gyroscope,accelerometer and odometer,and the hardware facilities are running pipeline and measuring car.Secondly,the strapdown inertial navigation algorithm used in the fiber optic gyro dam deformation measurement method is introduced and the odometer is introduced.The SINS / OD combined positioning algorithm is studied and the error of the method is analyzed.Then,the filtering method of fiber optic gyroscope is studied,and a new filtering algorithm is proposed,which is verified by simulation and measured data.Finally,the feasibility of the above measurement methods was verified through simulation experiments,and the pipeline trajectory and inertial device data were generated.The positioning accuracy was tested using SINS and SINS / OD combined positioning algorithms.The experimental results show that the horizontal and vertical positioning accuracy when using the SINS / OD combined positioning algorithm are in the centimeter level,which provides a reference for the field implementation of the program and the selection of fiber optic gyroscopes.