Study Of Applying Fiber Optic Gyro Strapdown Inertial Navigation System On Deformation Monitoring Of High Concrete Face Rockfill Dam

At present hydropower development are more concentrated in southwest China,where natural fall river,suitable for the construction of high dam.Concrete face rockfill dam(CFRD) is the preferred type,because these areas belong to high seismic risk,economic underdevelopment,blocking traffic,lack impermeable material.Dams must be safely monitored to ensure its safe operation,settlement of dam body and panel deflection can run the most intuitive response state dam.So the settlement of dam body and panel deflection monitoring is essential to the project.Water tube sedimentation and inclinometer are monitoring point and life is limited.These conventional monitoring instruments has been difficult to meet the monitoring requirements with the increase of the dam height.Therefore,we must develop a more effective monitoring methods to solve the practical engineering problems.In this paper,aiming at the deficiency of conventional instruments in monitoring,FOG subject to vibration and drift problems affecting the measurement accuracy. Put forward a kind of FOG strapdown inertial navigation system monitoring method of dam deformation,which uses a combination of FOG and accelerometer measured the tilt value of the object,according to the variation of angle to solve the deformation of dam body.First of all, the research of fiber optic gyroscope and accelerometer error of measurement.Accurately calculate the range and accuracy of the monitoring system of the dam deformation monitoring, can reach millimeter accuracy.An improved calculation formula of the dam deformation monitoring,will monitor the process of monitoring the speed of the car to piecewise function given in the form.To a certain extent.This approach can solve the problem of monitoring the car running is not uniform.Secondly,the research on FOG SINS algorithm,introduces the aerospace operator strapdown solution algorithm. Need to measure element analysis of dam deformation monitoring proposed strapdown solution method based on Kalman filter fusion.Calculating the optimal tilt value measured by the main fusion Kalman filtering solution.Since FOG and accelerometer measurement process there will be noise.Study filtering noise analysis method wavelet analysis for this thesis,db3 Wavelet filtering noise best.Third,FOG SINS platform to realize the monitoring of dam deformation, includingthe monitoring of the pipeline,monitoring the car,FOG,accelerometers,data acquisition board,data logger, power supply and software development. Study a low dynamic,high-precision FOG as a core measurement devices. FOG and accelerometer are implemented by data acquisition boards of synchronous sampling and data fusion,real-time measurement data storage fused to the data logger. Software development mainly use MATLAB programming to complete the complex calculating. Finally calculated dam deformation value and draw deformation curve.Finally, through field experiments and data analysis to verify the FOG SINS monitoring system for dam deformation monitoring is feasible, measurement good stability,repeatability,high measurement accuracy.Low dynamic high precision FOG is better than high dynamic and high precision FOG higher stability and is more suitable for monitoring dam deformation.For the dam deformation monitoring provides a new method of measurement.