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An Underwater Identification Method of Leakage Noise from Large Water Conveyance Buildings

A recognition method and building technology, applied in character and pattern recognition, by detecting the appearance of fluid at the leak point, the direction of instruments, etc., to achieve the effect of simple and reliable positioning method and accurate positioning results

Active Publication Date: 2021-11-23
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the spectral characteristics of leakage noise from large water delivery buildings are quite different from those of oil and gas pipelines, municipal water supply pipelines, etc., and the leakage detection methods of oil and gas pipelines cannot be directly transferred.

Method used

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  • An Underwater Identification Method of Leakage Noise from Large Water Conveyance Buildings
  • An Underwater Identification Method of Leakage Noise from Large Water Conveyance Buildings
  • An Underwater Identification Method of Leakage Noise from Large Water Conveyance Buildings

Examples

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Embodiment 1

[0059] 1 Experimental method

[0060] In this example, the Shuangjihe aqueduct of the middle line of the South-to-North Water Diversion Project was selected to carry out on-site detection experiments. The aqueduct has a total length of 810m, including the entrance and exit transition section, the entrance and exit lock chamber section, the entrance and exit connecting section and the tank body. Among them, the length of the aqueduct is 600m, and it is a beam-type aqueduct with a span of every 30m, a total of 20 spans. The body of the tank has two sets of four holes, the net width of a single hole is 7.0m, and the net height is 7.45m. The tank body is a prestressed concrete rectangular tank, and the cross-section of the tank body is shown in Figure 2(a) and Figure 2(b). The tank body of the second hole on the east side is selected as the experimental flow channel. The experiment coincides with the maintenance period. The gates at both ends of the flow channel of this hole ar...

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Abstract

The present invention relates to an underwater identification method for leakage noise of a large-scale water-conveying building, which is characterized in that it comprises the following steps: 1) continuously collecting the leakage noise generated when a large-scale water-conveying structure leaks to obtain an underwater acoustic signal; 2) ) using the iterative method to extract the continuum from the collected underwater acoustic signal to obtain the continuum of the leakage noise; Location of leaks in large water delivery structures. The invention identifies the leakage signal by extracting the continuous spectrum in the underwater mobile detection data, and can locate the leakage source according to the distribution result of the measured leakage noise signal along the course, and the positioning result is more accurate. The invention can be widely used in the field of leakage noise detection of large water delivery buildings.

Description

technical field [0001] The invention relates to an underwater identification method for leakage noise of a large-scale water delivery building, belonging to the field of engineering detection of water delivery buildings. Background technique [0002] Large-scale water transfer structures include structural types such as aqueducts, inverted siphons, hidden culverts (canals), tunnels, and large pipelines. During the long-term operation of large-scale water-conveying buildings, leaks occur due to water-stop damage at joints and concrete cracks, which affect the safe operation of the structure and cause structural damage. Therefore, it is very necessary to regularly detect leakage defects of large-scale water conveyance buildings in service, and to repair and strengthen them at an appropriate time. [0003] For a long time, most of the water conveyance structures need to be vented regularly for service status inspection. However, on the one hand, with the development of the ec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/24G06K9/00
CPCG01M3/24G06F2218/00
Inventor 刘毅商峰黄涛冯少孔宋文杰
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES