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Research on the Experiment System of Electro-Magnetic Ultrasonic in Pipelines’ Cracks Detection

Author: LiShuang
Tutor: LinWeiGuo
School: Beijing University of Chemical Technology
Course: Control Science and Engineering
Keywords: Electromagnetic Acoustic Pipeline defects Non-destructive testing Defect Location
CLC: TP274.53
Type: Master's thesis
Year: 2010
Downloads: 263
Quote: 2
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Abstract


The pipeline quality testing is an important means for the protection of pipeline transportation safety. Non-destructive testing method is mainly used in the actual monitoring emerging EMAT technology with non-contact with the measured object, to detect not need coupling agent, without the surface of the object to be measured pre-treatment, etc., unparalleled application prospects. The main subject of the research is to design an experimental system based on the the EMAT technology of metal pipes crack defects detection. The key steps of the study include: the design of the experimental system, the use of the electromagnetic ultrasonic technology incentives, receiving ultrasound; build an experimental environment, the completion of the production and preparation of test pieces, installation, commissioning experimental system; collection and analysis of experimental data, proposed wall defects detection and location of defects. The paper describes the system works, analysis of the scope of application of a variety of ultrasonic type, according to the wall thickness of the test pieces produced transceiver separate electromagnetic ultrasonic transducer, the electromagnetic ultrasonic excitation signal driver circuit and electromagnetic ultrasonic receiver signal processing circuit design, software design, and experimental data acquisition, processing and analysis. Transducer designed to motivate and receiving Lamb wave electromagnetic ultrasonic transducer; hardware circuit includes a driver circuit EPM1270 series CPLD core module and receiver signal processing circuit module; software design, including timing control program based on CPLD technology algorithm and MATLAB signal handler. During the experiment, the first prepared period embedded cracks in the metal pipe used for the experimental study, marking the graduation at the wall outer surface, and then install the experimental system, the use of the experimental system excitation and reception of electromagnetic ultrasonic signal acquisition and storing the received electromagnetic ultrasonic signal , write a MATLAB algorithm for processing the collected data. On the basis of a large number of experiments, the use of the reception of the signal amplitude attenuation law, to achieve the positioning of the pipeline defect detector and a defect in the pipe axial position. The axial position of the locating defects, the presence of defects in the pipe at an axial position radially simultaneously paired rotational excitation and receiving transducer, and the the acquisition receiving electromagnetic ultrasonic signal, analysis of each collected data and to make a graph, using curve there are dramatic changes in the minimum value of the voltage amplitude to determine the radial position of the defect. By a large number of experiments and actual position compared with the defect, the validation of the experimental system can achieve more accurate pipeline crack detection and positioning.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system > Automatic detection system using a variety of new technologies > Ultrasonic testing equipment
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