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

A surface water film and ultrasonic technology, which is applied in the field of bridge construction, can solve the problems of not being able to ensure the accuracy of waterline thickness and width direction at the same time, not being able to track waterline movement well, and not being able to obtain water film/waterline, etc. Simple, high-precision, and real-time monitoring of system integration

Inactive Publication Date: 2009-02-11
李惠 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 met

Method used

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

Examples

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Effect test

Embodiment 1

[0025] Embodiment 1, combining figure 1 , The ultrasonic thickness measuring system of the water film / water line on the surface of the stay cable of the present invention is composed of a software system and a hardware system. The software system includes a data acquisition program and a data processing program. The acquisition program is written in Bland C++ language, and the thickness of the water film / water line is collected in real time and continuously during the wind and rain excitation process, and the data volume is huge; the data processing program is written in Matlab. Mass processing of water film / water line thickness data. The hardware system is divided into the external device of the stay cable model and the internal device of the model. The external device of the cable stay model includes: industrial computer, A / D high-speed data conversion card, pulse receiving transmitter and DC stabilized power supply; the internal device of the cable stay model is composed o...

Embodiment 2

[0026] Example 2, combined with figure 2 , the industrial computer of the stay cable model external device of the present invention is mainly to run the acquisition program, save the massive data converted by the A / D high-speed data conversion card, and require the hard disk to be large-capacity (more than 500G), high-speed (10000 rpm above). The function of the A / D high-speed data conversion card is to convert the voltage signal into a digital signal, and the acquisition speed of the conversion card is selected according to the crystal frequency of the ultrasonic transducer. The function of the pulse receiving transmitter is to send a high-voltage pulse to the ultrasonic transducer, so that the chip on the transducer vibrates at a high frequency (for example, 10MHz) to generate a high-frequency ultrasonic pulse signal. At the same time, the ultrasonic acoustic transducer can receive the ultrasonic echo signal reflected from the upper and lower surfaces of the measured water...

Embodiment 3

[0027] Example 3, combined with figure 1 , the working process of the ultrasonic thickness measuring system for the water film / water line on the surface of the cable stay is as follows: the industrial computer starts the acquisition program, sends an instruction to the pulse transmitter receiver through the A / D data conversion card, and the pulse transmitter receiver sends the ultrasonic wave to the receiver. The transducer emits a high voltage, and under the action of the high voltage, the transducer vibrates to generate ultrasonic pulses. Then the ultrasonic pulse is reflected twice on the upper and lower surfaces of the water line / water film, and the echo signal is converted into a low-voltage signal by the ultrasonic transducer and the pulse transmitter receiver and transmitted to the A / D high-speed data conversion card, and finally through the A / D Convert, store the signal in digital form.

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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...

Claims

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Application Information

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IPC IPC(8): G01B17/02G01B17/06G01B17/00G01S15/02G01M7/02
Inventor 李惠陈文礼李凤臣
Owner 李惠
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