Ultrasonic thickness measurement system for aqueous film/water line at surface of staying cable

Abstract

The invention provides a stay cable surface water film / water line ultrasonic thickness measurement system. A hardware system thereof comprises an industrial control computer, an A / D high-speed data acquisition card, a pulse transmitting and receiving device, a DC voltage stabilizing power supply, an ultrasonic transducer and a fixed device thereof, a reflection surface (being composed of a micro-motor and the 45-degree reflection surface) which can rotate by 45 degrees and the fixed device thereof; and a software system comprises a data acquisition system. The ultrasonic thickness measurement system utilizes the reflection surface which can rotate by 45 degrees and carries out the real-time monitoring of a water film / water line of the stay cable surface on the basis of the ultrasonic reflection principle. The ultrasonic thickness measurement is the nondestructive monitoring, so that the ultrasonic thickness measurement system can not affect the formation and the motion of the stay cable surface water film / water line, but can obtain the real-time thickness, the width, the shape and the vibration properties of the stay cable surface water film / water line, thereby having the advantages of simple structure, safety, reliability, convenient practical application and the like.

Description

(1) Technical field [0001] The invention relates to bridge construction technology, in particular to an ultrasonic thickness measuring system for water film / water line on the surface of a stay cable. (2) Background technology [0002] In 1988, Hikami of Japan discovered a kind of large-value cable vibration on the Meikonishi cable, which was called wind and rain induced vibration. The wind and rain induced vibration is the most severe vibration found on the stay cable so far, and the maximum amplitude reaches 2m. In the past 30 years, such large-scale wind and rain-induced vibrations of cable-stayed cables have been found on cable-stayed bridges all over the world. Therefore, it is of great significance to study the mechanism of wind-rain-induced vibration of stay cables. [0003] The wind-rain-induced vibration is produced under the joint action of wind and rain, but only occurs under a certain amount of rainfall and wind speed. The results of on-site observation and win...

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Problems solved by technology

When using this method, it is assumed that enough and dense probes must be arranged to ensure the accuracy of measuring the waterline in the width direction, but in this way, dense probes will inevitably hinder the formation and movement of the waterline, so this The measurement method cannot guarantee the accuracy of the thickness of the waterline and the width direction at the same time, so it cannot track the movement of the waterline very well, and it is only measured in a local area, and the water film / waterline around the stay cable ring cannot be obtained

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