A method of multi-crack shape identification from eddy current testing signals of steam generator tubes including support plates as noise sources

Yoshiaki Nagaya, Hisashi Endo, Toshiyuki Takagi, Tetsuya Uchimoto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This paper deals with identifying multiple cracks from eddy current testing (ECT) signals obtained in a steam generator tube with a support plate and deposits. Assume two-dimensionally scanned ECT signals to be a picture image, then the signal processing by a multi-frequency technique eliminates noise caused by the support plate and deposits. A template matching with help of genetic algorithms detects number and positions of cracks from the image after the signal processing. Inverse analysis estimates the crack profile based on the predicted position of cracks. The number and positions of the cracks are sufficiently well predicted. Crack shape reconstructions are achieved with a satisfactory degree of accuracy.

Original languageEnglish
Pages (from-to)254-261
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume71
Issue number2
DOIs
Publication statusPublished - 2005 Feb

Keywords

  • Eddy Current Testing
  • Genetic Algorithms
  • Inverse Problems
  • Multiple Cracks
  • Nondestructive Inspection
  • Numerical Analysis
  • Steam Generator Tubes
  • Support Plates
  • Template Matching

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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