Magnetic Inertial Navigation Monitoring System for Dam Inner View

Abstract

The invention provides a magnetic and inertial navigation monitoring system inside a dam. A flexible detection tube is embedded in the dam body, a monitoring device that walks along the flexible detection tube is installed in the flexible detection tube, and a three-axis magnetic sensor is installed in the monitoring device. The door sensor and the accelerometer are also provided with a solution chip in the monitoring device. By using a combination of a flexible detection tube and a monitoring device with a three-axis fluxgate sensor and an accelerometer, the monitoring accuracy can be improved, and the problems of the existing optical fiber gyroscopes with large cumulative errors and difficult compensation of zero drift errors can be overcome, and almost fixed The constant geomagnetic induction line is used as the measurement reference to improve the accuracy of the data obtained by the entire monitoring device. Cooperating with high-precision accelerometers and other equipment can further improve the measurement accuracy of data and greatly reduce engineering costs. The accuracy of the invention for the deflection deformation of the flexible detection tube can reach 1 mm.

Description

technical field [0001] The invention relates to the field of civil engineering and water conservancy engineering measuring devices, in particular to a magnetic inertial navigation monitoring system inside a dam. The present invention is especially suitable for the internal magnetic inertial navigation monitoring of various types of ultra-high rockfill dams, such as core wall rockfill dams, concrete face rockfill dams, etc., and can also be used for roads and bridges and other projects. Background technique [0002] With the construction and development of water conservancy projects, the field of dam safety monitoring has become an indispensable part of dam construction. Dam safety monitoring is an effective means to understand the operating state and condition of the dam, and it is also an important means to ensure the safety of property and life. Small and simple monitoring instruments with strong anti-interference ability, good durability, high precision and wide measurem...

AI Technical Summary

Problems solved by technology

The disadvantage of the traditional subsidence instrument is that the observation results are greatly affected by the interference of environmental factors such as air pressure and temperature, and the settlement monitoring is a point-based observation. The number of sections arranged is about 4 per 100 meters, which greatly interferes with the construction and costs more expensive

However, this observation system is an integrated high-precision fiber optic gyroscope, and the observation requirements are low dynamic and high-precision. The closed-loop fiber optic gyroscope used is expensive and has a large cumulative error

In addition, the traction device in patents CN1558182 and CN1558181 is difficult to achieve uniform movement. The monitoring pipeline is connected by a high-rigidity steel pipe and a bellows. The steel pipe is 6 meters long and the bellows is 0.3 meters. Only the bellows will be deformed with the deformation of the dam body. It deforms accordingly, and the steel pipe section is difficult to truly reflect the actual deformation of the dam body; in addition, there are also deficiencies in the miniaturization of the instrument. The inner diameter of the monitoring pipeline must be in the range of 0.3m to 0.5m, and there are hidden dangers to the safety of the dam structure

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