During detection of the defects in the inner wall of a petroleum pipeline via an ultrasonic nondestructive evaluation method, the defect echo and the inner-wall echo often overlap. It is difficult to identify the arriving time of the defect echo. When an ultrasonic wave propagates in a viscoelastic medium, the stress relaxation and creep deformation result in a signal characterized by frequency. The wave speed and attenuation rate are dependent on the frequency; thus, the ultrasonic signal has different shapes along the wave propagation path. Sometimes the wave shape is wry. The empirical mode decomposition technology used for separating the overlapping echo signals has been presented in this paper. With such technology, the original ultrasonic signal can be decomposed and then some intrinsic mode functions (IMFs) and a residue can be obtained. Different IMFs contain different echo signals. Some useful IMFs are selected to reconstruct the ultrasonic signal. The peaks of the reconstructed ultrasonic signal envelope indicate the arriving time of the echo signals. The experimental results show that this method is effective for detection of the defects in the inner wall of a petroleum pipeline.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Ultrasonic defect detection of a petroleum pipeline in a viscoelastic medium


    Weitere Titelangaben:

    Fehlernachweis mit Ultraschall an einer Erdöl-Pipeline in einem viskoelastischen Medium


    Beteiligte:
    Wei, L. (Autor:in) / Que, P.W. (Autor:in) / Qi, Z. (Autor:in) / Guang, Y. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2006


    Format / Umfang :

    8 Seiten, 9 Bilder, 7 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch





    Petroleum pipeline sling

    Europäisches Patentamt | 2021

    Freier Zugriff

    Defect detection in ultrasonic images

    D'Sa, E.J. / Ramakrishnan, K.R. / Krause, P. | Tema Archiv | 1989


    Petroleum pipeline hoisting device

    ZHOU WEI / ZHANG TONGQING | Europäisches Patentamt | 2022

    Freier Zugriff

    Petroleum pipeline assembling equipment

    WU YIYONG | Europäisches Patentamt | 2023

    Freier Zugriff