Acoustic active detection-based diagnosis method for blockage faults and pipeline tee joints in buried drainage pipelines

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...

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

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