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2020 Fiscal Year Annual Research Report

Three-dimensional profile reconstruction of a natural SCC colony through electromagnetic NDT methods

Research Project

Project/Area Number 19F19045
Research InstitutionTohoku University

Principal Investigator

遊佐 訓孝  東北大学, 工学研究科, 教授 (60466779)

Co-Investigator(Kenkyū-buntansha) GE JIUHAO  東北大学, 工学(系)研究科(研究院), 外国人特別研究員
Project Period (FY) 2019-07-24 – 2022-03-31
KeywordsSCC colony / inversion problem / rotating eddy currents
Outline of Annual Research Achievements

1) Fabricated and tested rotating eddy current testing probes employing TMR sensor and coil as pick up sensors. 2) Expanded the principle of rotating eddy current testing technique, and extracted the signals of rotating eddy current testing technique at desired induced eddy current orientation. 3) Analyzed the signal features of rotating eddy current testing signal of pitting corrosion and slits near weld. The signals of slits near weld were transformed using the proposed algorithm to increase signal to noise ratio. 4) Analyzed the influence of crack colony parameters (length, depth, distance, type et al.) on signals. According to the results, an initial algorithm was proposed to decompose the superposition signals of crack colony. This method can be used in the inversion problem to accelerate iteration process. 5) Generated SCCs using designed bending machine.
6) Proposed an eddy current dipole based algorithm to reconstruct the surface profile of complex cracks according to the eddy current distribution around cracks. The algorithm was tested through simulation and experiment data.
7) Built a finite element code of rotating eddy current testing. Proposed an algorithm based on Tabu search and Ant colony optimization algorithms to size the depth of single crack. 8) Built a code to show three dimensional profile of cracks using openGL.

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

Research goes well as planned.

Strategy for Future Research Activity

1) Test the proposed depth sizing algorithm using experiment data.
2) Submit research report to JSPS

  • Research Products

    (2 results)

All 2021 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (1 results)

  • [Journal Article] Frequency component mixing of pulsed or multi-frequency eddy current testing for nonferromagnetic plate thickness measurement using a multi-gene genetic programming algorithm2021

    • Author(s)
      Ge Jiuhao、Yusa Noritaka、Fan Mengbao
    • Journal Title

      NDT & E International

      Volume: 120 Pages: 102423~102423

    • DOI

      10.1016/j.ndteint.2021.102423

    • Peer Reviewed
  • [Presentation] Feature combination study of multi frequency ECT on nonferromagnetic plate thickness measurement2020

    • Author(s)
      Ge J, Yusa N, Fan M
    • Organizer
      第32回電磁力関連のダイナミクス

URL: 

Published: 2021-12-27  

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