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Crack detection in thick-walled cylinders

  • US 8,818,746 B1
  • Filed: 03/25/2011
  • Issued: 08/26/2014
  • Est. Priority Date: 03/26/2010
  • Status: Active Grant
First Claim
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1. A method for establishing the size of a defect in a thick-walled, cylindrical geometry comprising, (1) creating an acoustic vibration in that geometry;

  • (2) detecting the vibration which results;

    (3) filtering that signal, to remove extrinsic noise; and

    (4) analyzing, on a general purpose computer, the resulting frequency pattern of the vibration by (a) using a Fourier transform to decompose the filtered frequency signal into its constituent major frequencies or spectrum;

    (b) computing the decay coefficient of the time series data; and

    (5) using a Bayes maximum likelihood statistical pattern classification algorithm to compare this decay coefficient to a library containing the decay coefficients of similar thick-walled, cylindrical geometries with varying size cracks therein, to determine the particular crack size thereof by correlating with the library data.

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