Pipeline positioning method

A positioning method and pipeline technology, applied in the field of urban pipeline leakage detection and precise positioning based on CEEMD, can solve problems such as residual noise, redundant modes, and non-invalid redundant component processing, so as to reduce residual noise and improve calculation efficiency effect

Active Publication Date: 2018-12-07
CHANGZHOU UNIV
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Problems solved by technology

In fact, CEEMD is not perfect, there are two main problems, one is the residual noise in the mode after signal decomposition; the other is the existence of redundant modes
In June 2017, in the article "Seismic Signal Denoising Based on ICEEMD", Yang Kai used the improved CEEMD method to denoise the noisy signal, but did not further process the invalid redundant components in the algorithm process

Method used

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Embodiment Construction

[0054] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0055] like figure 1 As shown, a CEEMD-based urban pipeline leak detection and precise location method includes the following steps:

[0056] S1: Raw data collection: install an acoustic emission sensor on the pipeline under test, collect the leakage signal through the sensor, and obtain the original signal x(t) of the pipeline leakage;

[0057] Experimental pipelines such as figure 2 , the pipeline length is 50m, the pipeline material is steel, the pipeline specification is DN150, the medium is compressed air, and the medium in the pipeline is in a flowing state; the upstream acoustic emission sensor 1 is placed at the zero point, and two distances are 16m and 30m away from the upstream acoustic emission sensor respectively. A leakage hole with a leakage hole diameter...

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Abstract

The invention discloses a pipeline positioning method. The pipeline positioning method comprises the steps that original signals are subjected to CEEMD; then noise-containing signals which are formedafter decomposition is accomplished are subjected to noise removal; cross-correlation calculation is conducted on the signals, and invalid redundancy components are removed according to the cross-correlation degree; and finally, the signals which are subjected to decomposition and noise removal are rebuilt, single leakage source signals are isolated through FastICA, and leakage points are positioned by use of a time difference positioning formula. The experiment result shows that the pipeline positioning method is suitable for detection and positioning of multi-point leakage of a metal pipeline, can improve the accuracy of pipeline leakage positioning to a large extent, and provides the powerful theoretical basis and the practical experience for practical engineering application.

Description

technical field [0001] The invention relates to the technical field of pressure pipeline leakage monitoring. More specifically, the invention proposes a pipeline positioning method, specifically a CEEMD-based urban pipeline leakage detection and precise positioning method. Background technique [0002] Pipeline transportation is the most economical transportation option when transporting large quantities of oil, gas, chemicals and water. It has the advantages of large transportation volume, uninterrupted transmission, and not affected by other factors such as climate. Therefore, pipeline transportation has become the fifth major mode of transportation after road transportation, railway transportation, water transportation and air transportation. [0003] During the long-term use of urban pipelines, it is easy to cause leakage due to various factors such as internal and external corrosion. Especially the small leaks that occurred in the early stage, due to the characteristi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17D5/06
CPCF17D5/06
Inventor 郝永梅朱一龙杜璋昊杨强
Owner CHANGZHOU UNIV
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