Intelligent monitoring method for leakage of natural gas pipeline

Abstract

The invention provides an intelligent monitoring method for leakage of a natural gas pipeline. The method comprises the following steps: collecting an audio signal during operation of the natural gas pipeline by using a sound array; performing imaging positioning on the audio signal by using a beam forming algorithm based on symbol coherence and feature space decomposition; obtaining an audio frequency spectrum in the direction of direction of arrival through a linear constraint minimum variance algorithm; and carrying out standardization processing by taking the frequency spectrum formed by the beam as a characteristic, and inputting the characteristic into a pre-trained natural gas leakage diagnosis model to obtain a pipeline condition. According to the intelligent monitoring method for leakage of the natural gas pipeline, a beam forming algorithm based on symbol coherence and feature space decomposition is used, side lobes are better restrained, the acoustic imaging resolution is better improved, high-contrast and high-resolution acoustic imaging and accurate positioning can be carried out on a leakage source on an on-site image, the accuracy of natural gas leakage diagnosis is effectively improved, and meanwhile, the workload and troubleshooting difficulty of operators on duty are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of natural gas leakage monitoring, and more particularly relates to an intelligent monitoring method and system for natural gas pipeline leakage. Background technique [0002] The global natural gas transportation and distribution network is complex and expanding. Research has shown that pipelines are the safest means of transporting gas, but that doesn't mean using them is risk-free. Therefore, ensuring the reliability of natural gas pipeline infrastructure has become a key requirement, and the generation of leakage is the main factor threatening the reliability of the pipeline network. Pipeline leaks are a significant concern, regardless of size, because of the potentially dramatic impact. These impacts go beyond the costs involved in downtime and repair costs, and can include substantial loss of resources, and possibly personal injury and environmental disaster. Due to factors such as external interfer...

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides an intelligent monitoring method and system for natural gas pipeline leakage, the purpose of which is to solve at least one of the existing problems of complex construction, poor stability, low accuracy and high cost. one

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