Abstract
The real-time monitoring of the flow environment parameters, such as flow velocity and direction, helps to accurately analyze the effect of water scour and provide technical support for the maintenance of pier and abutment foundations in water. Based on the principle of the Fiber Brag Grating sensor, a sensor for monitoring the flow velocity and direction in real-time is designed in this paper. Meanwhile, the theoretical calculation formulas of flow velocity and direction are derived. The structural performance of the sensor is simulated and analyzed by finite element analysis. The performance requirements of different parts of the sensor are clarified. After a sample of the sensor is manufactured, calibration experiments are conducted to verify the function and test the accuracy of the sensor, and the experimental error is analyzed. The experimental results indicate that the sensor designed in this paper achieves a high accuracy for the flow with a flow velocity of 0.05–5 m/s and the flow velocity monitoring error is kept within 7%, while the flow direction monitoring error is kept within 2°. The sensor can meet the actual monitoring requirements of the structures in water and provide reliable data sources for water scour analysis.
Highlights
In the long-span bridge construction and operation process, the construction platform and pier foundation are affected by water scouring and other factors [1,2,3,4]
Fiber Bragg Grating (FBG) sensor for flow velocity and flowisdirection is to proposed sensor for flow and flow direction monitoring proposedmonitoring in this paper provide in this paper to provide technical support for bridge construction and operation
Cardan Plate Flow Direction Adaptation when the water flow direction is parallel to the plane of the Cardan plate and flows from the near shaft end to the far shaft end, the cardan plate will be in the balance state and will not rotate; otherwise, it will continue to rotate to the balance state
Summary
In the long-span bridge construction and operation process, the construction platform and pier foundation are affected by water scouring and other factors [1,2,3,4]. Real-time monitoring of flow velocity and direction is essential to effectively analyze and control the scour of water flow on the construction platform and pier, reasonably maintaining the pier foundation and abutment in water and ensuring safety during construction and operation [8,9]. Based on the well-known physical principle of Doppler frequency shift, the ADCP instrument obtains the velocity of the corresponding point by measuring the Doppler frequency shift. This instrument has the drawbacks of high cost and complex circuit integration, and it is affected by the external environment. FBG sensor for flow velocity and flowisdirection is to proposed sensor for flow and flow direction monitoring proposedmonitoring in this paper provide in this paper to provide technical support for bridge construction and operation.
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