Method and system for measuring propagation speed of natural gas pipe leakage vibration wave

Abstract

The invention discloses a method and system for measuring propagation speed of natural gas pipe leakage vibration wave. The method and the system are on the basis of an optical fiber sensed natural gas pipe leakage monitoring method. A natural gas pipe leakage monitoring system selects a known sensing unit point to simulate pipe leakage in the form of hitting a pipe to initiate vibration; according to the number of pipe sections used in project construction and inspection and acceptance data, leakage signals transmitted to two adjacent sensing units are subjected to time-delay estimation; leakage vibration wave speed is measured by combining known pipe length; the distances from the current test point to two adjacent sensing unit points are accurately obtained; a simulating test point X is substituted into the formula that X is equal to L-[v*(tn+2-tn)] / 2 to inversely solute the formula that v is equal to 2(L-X) / (tn+2-tn); and the propagation speed of vibration wave along the pipe is measured according to the distance between known sensing units and detected signal transmitting time. The method and the system are high in sensitivity and accuracy, and low in false alarm rate and are not easily affected by environmental factors.

Description

technical field [0001] The invention relates to a method and a system for measuring the propagation velocity of a natural gas pipeline leakage vibration wave, and relates to the technical fields of mechanical vibration measurement, impact measurement and pipeline systems. Background technique [0002] At present, the total length of pipelines built in the world has reached 2.5 million kilometers, which has surpassed the total mileage of railways and has become the main mode of energy transportation in the world. Oil transportation in developed countries and oil-producing regions in the Middle East has all realized pipelines. my country's pipelines have also developed rapidly in recent years, with a total length of more than 70,000 kilometers. A large energy pipeline network has initially formed across the east, west, north and south, covering the whole country, and connecting overseas. Pipeline transportation has become the deployment of strategic energy such as oil and gas. ...

AI Technical Summary

Problems solved by technology

However, this type of technology is affected by interference events around the pipeline when monitoring leakage, has a high system false alarm rate, and has poor anti-interference ability

As a distributed optical fiber sensing monitoring method, the measurement method of pipeline leakage vibration wave propagation velocity also has a high system false alarm rate and poor anti-interference ability.

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