Ultrasonic guided wave compressed sensing health monitoring method for pipeline

Abstract

The invention discloses an ultrasonic guided wave compressed sensing health monitoring method for a pipeline. The method comprises the steps of installing an ultrasonic guided wave emitting and receiving transducer on the pipeline, wherein the emitting end of the ultrasonic guided wave emitting and receiving transducer excites required modal guided waves, and the receiving end of the ultrasonic guided wave emitting and receiving transducer receives the corresponding modal guided waves; conducting discrete sampling on the guided waves to obtain guided wave monitoring data, conducting digital random modulation on the data to obtain an observation and measurement matrix and measurement vectors, and storing the measurement vectors into a corresponding storage; calculating atoms with differentpropagation distances according to a guided wave propagation theory to construct a guided wave over-complete dictionary; utilizing orthogonal matching pursuit for decomposing the measurement vectors on the observation and measurement matrix and a product matrix of the dictionary to obtain sparse vectors; conducting defect location according to positions of nonzero values of the sparse vectors, andjudging the defect degree according to numerical values of the nonzero values; conducting monitoring multiple times according to a preset time, conducting compressed sensing on monitoring data obtained multiple times to obtain a defect development tendency. By means of the method, the data memory space is reduced, and meanwhile, the defect monitoring precision is guaranteed.

Description

technical field [0001] The invention relates to the technical field of nondestructive testing, in particular to a pipeline ultrasonic guided wave compressive sensing health monitoring method. Background technique [0002] Pipelines transporting oil and gas are exposed to corrosion and stress during service, so defects inevitably occur and shorten the life of the pipeline. When defects lead to oil and gas leakage, safety accidents such as explosions may occur, threatening property and personal safety. Therefore, regular monitoring of the pipeline structure is required to grasp its health status. Ultrasonic guided waves provide an effective method for pipeline health monitoring, and the monitoring scheme using in-situ sensors can monitor pipelines for a long time, thereby helping to diagnose the severity of defects and predict the health status. The guided wave can propagate along the pipeline for a long distance, and the guided wave covers the entire pipe wall thickness rang...

AI Technical Summary

Problems solved by technology

[0003] However, long-term pipeline monitoring will bring a large amount of data, and the storage of these data needs to consume a lot of memory, and conventional data compression methods may cause information loss, which has become an important problem restricting pipeline health monitoring

At present, there is a lack of suitable ultrasonic guided wave data compression recovery methods for pipeline health monitoring

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