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A method for diagnosing blockage faults of buried drainage pipes and pipe tees based on active acoustic detection

A drainage pipeline and active detection technology, which is applied in the pipeline system, uses acoustic wave emission technology for material analysis, gas/liquid distribution and storage, etc. It can solve the problems of pipeline blockage, pipeline tee pieces and signals that are difficult to distinguish, and improve accuracy. sexual effect

Active Publication Date: 2020-12-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the degree of pipeline blockage and the signal of the pipe tee are difficult to distinguish during the detection process of buried drainage pipeline blockage, the present invention provides a method for diagnosing buried drainage pipeline blockage faults and pipeline tee pieces based on acoustic active detection

Method used

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  • A method for diagnosing blockage faults of buried drainage pipes and pipe tees based on active acoustic detection
  • A method for diagnosing blockage faults of buried drainage pipes and pipe tees based on active acoustic detection
  • A method for diagnosing blockage faults of buried drainage pipes and pipe tees based on active acoustic detection

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Embodiment 1

[0043] Embodiment 1: A detection device based on the blockage fault of the buried drainage pipe and the tee piece based on acoustics. The experimental device is attached figure 1 shown. During the specific implementation, two telescopic brackets are inserted into the bottom of the pipeline through the manhole cover, and the two rods are side by side. The speaker at the lower end of one of the telescopic brackets is fixed to emit sound waves in the buried drainage pipe. The speaker model is the American EVUW30 underwater speaker. , the sound wave signal is generated by a computer-controlled sound card equipped with WinLMS software to generate a 10-second sine sweep sound signal. The sound card model is ASUS Xonar D-Kara, and the frequency range of the signal is 100-6000 Hz. The amplified signal passes through the telescopic rod The built-in wire of Ⅰ is transmitted to the speaker, and the LM3886 power amplifier is selected; the sound wave receiver is placed at the bottom of th...

Embodiment 2

[0044] Embodiment 2: In this embodiment, data from the pipeline laboratory of the University of Bradford in the United Kingdom is used for example verification, and the specific method is as described in the foregoing summary of the invention.

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Abstract

The invention discloses an acoustic active detection-based diagnosis method for blockage faults and pipeline tee joints in buried drainage pipelines, and belongs to the field of pipeline fault diagnosis. The diagnosis method comprises the following steps of selecting a corresponding pipeline and detecting the pipeline by a detector, and acquiring signals under four working conditions from a receiving end by a computer; performing wavelet packet decomposition on an acquired acoustic signal; extracting the energy distribution feature, the sample entropy and the waveform feature of each frequencyband component, and forming feature vectors with multiple feature cascades to represent the signals under the different working conditions; establishing a super complete dictionary with the feature vectors of training samples collected in advance; and acquiring reconstruction signals of detection signals in different classes by employing a sparse representation method on the basis of the super complete dictionary, and calculating the residual values of test samples and the reconstruction signals of the test samples to realize recognition of the blockage degree and tee joints in the pipeline.The diagnosis method disclosed by the invention is capable of recognizing the blockages of different degrees and the pipeline tee joints in the pipeline, and the accuracy of a recognition result is increased; and the diagnosis method has certain robustness on the change of the external environment.

Description

technical field [0001] The invention relates to a method for diagnosing blockage faults of buried drainage pipes and pipe tees based on active acoustic detection, and belongs to the field of pipe fault diagnosis. Background technique [0002] With urbanization, the network of underground utility sewers that serve our towns and cities has become one of the most important pieces of infrastructure, yet it is invisible above ground, so unless it malfunctions like clogs, leaks, etc. , otherwise such a network would not be noticed. The drainage pipes have been used for a long time, which is very easy to cause blockage in the pipes. Blockage faults manifest as varying degrees of partial blockage in the early stage, so they are easily overlooked. Finally, the blockage area continues to expand, which will not only affect the drainage function, but also may bring safety hazards. Therefore, the monitoring and inspection of drainage pipes has become very important to avoid fatal acci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D5/06G01N29/14
Inventor 冯早伍林峰吴建德王晓东范玉刚黄国勇邹金慧
Owner KUNMING UNIV OF SCI & TECH
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