The development of automatic guided wave interpretation for detecting corrosion in aluminum aircraft structural stringers is described. The dynamic wavelet fingerprint technique DWFT is used to render the guided wave mode information in two-dimensional binary images. Automatic algorithms then extract DWFT features that correspond to the distorted arrival times of the guided wave modes of interest, which give insight into changes of the structure in the propagation path. To better understand how the guided wave modes propagate through real structures, parallel-processing elastic wave simulations using the finite integration technique (EFIT) has been performed. Three-dimensional (3D) simulations are used to examine models too complex for analytical solutions. They produce informative visualizations of the guided wave modes in the structures and mimic the output from sensors placed in the simulation space. Using the previously developed mode extraction algorithms, the 3D EFIT results are compared directly to their experimental counterparts.


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    Title :

    Lamb wave characterization of corrosion-thinning in aircraft stringers. Experiment and three-dimensional simulation


    Additional title:

    Charakterisierung der Korrosionsabtragung in Flugzeugholmen mittels Plattenwellen


    Contributors:

    Published in:

    Publication date :

    2009


    Size :

    11 Seiten, 11 Bilder, 48 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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