Multi-mode guided wave industrial pipeline diagnosis method

Abstract

The invention discloses a multi-modal guided-wave industrial pipeline diagnostic method used for real-time diagnosis of pipeline defects, and positioning, quantification, qualitative detection, and early-stage diagnosis of defects. A diagnostic device comprises three modules including a computer, a host machine, and a sensor array. According to the multi-modal guided-wave industrial pipeline diagnostic method, the sensor array is changed, and L(0, 2) and T(0, 1) modal ultrasonic guided-wave modes are stimulated by a multi-channel time delay signal stimulation system, so that diagnosis accuracy on different defects is increased; whole ring sensor whole ring signals and single sensor signal are collected via a plurality of sets of acquisition cards and change-over switch combination circuits of a host machine acquisition channel, signal treatment is carried out so as to obtain a DAC time-histories displacement curve and a modal symmetry curve, and realize quantification, qualitative detection, and early-stage diagnosis of defects; and signal characteristic parameters are extracted so as to form one-dimensional feature vector for defect kind identification. The multi-modal guided-wave industrial pipeline diagnostic method can be used for pipeline real-time on-line detection, and is high in detection accuracy.

Description

technical field [0001] The invention relates to a method for diagnosing defects of industrial pipelines, in particular to a method for diagnosing industrial pipelines with multi-mode guided waves, and belongs to the technical field of safety detection and protection of industrial pipelines. Background technique [0002] Various pipelines are widely used in our production and life, especially in industrial sectors such as electric power, petroleum, chemical industry, natural gas and urban tap water, and play an important role. However, in recent years, the seriousness of industrial pipeline safety problems has emerged, and major accidents involving explosion casualties have occurred frequently, and the accidents of work stoppage and production stoppage caused by leakage have become innumerable. The safety of pipeline transportation has become a prominent issue affecting economic development and social stability. In order to quickly and accurately detect the location of the d...

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Problems solved by technology

[0004] Foreign countries have also developed corresponding testing equipment for the research of guided wave technology, such as the long-distance oil and gas pipeline guided wave testing equipment produced by Plant Integrity, the Teletest testing equipment produced by British Welding Company, and the wavemaker testing equipment produced by British Ultrasonic Guided Wave Company, etc. , but foreign equipment only uses a single mode for detection, which cannot meet the sensitivity requirements of different defects

In addition, foreign guided wave instruments only collect single-channel sequential acquisition of sensors, not real-time acquisition

Due to the use of complex algorithms for processing, the entire detection time takes about 10s, and foreign instruments are expensive, and the cost of introduction is relatively high

[0005] The document "Research and Development of Small-scale Ultrasonic Guided Wave Pipeline Inspection System" uses a single mode for detection, which has poor adaptability to different defects in the pipeline. The system acquisition method only collects a single sensor, and the acquisition is not real-time , and did not describe the later signal processing technology, and did not discriminate the size and type of defects

[0006] The pipeline ultrasonic guided wave detection system disclosed in the patent CN202994735U does not adopt multiple modes to detect the pipeline, and does not describe the defect detection process and identification method. In addition, the system does not adopt the reverse echo elimination technology and cannot judge defects. correct orientation

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