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1997 Fiscal Year Final Research Report Summary

Non-destructive investigation of a structure by vibration analysis

Research Project

Project/Area Number 08650475
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 計測・制御工学
Research Institutionlwate University

Principal Investigator

ABE Masato  Iwate University, Faculty of Engineering, Professor, 工学部, 教授 (00159443)

Co-Investigator(Kenkyū-buntansha) MIWA Jouji  Iwate University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (60125664)
Project Period (FY) 1996 – 1997
KeywordsDefect investigation / Structure / Surface wave / Beamforming / 音波検査
Research Abstract

We have developed a method to estimate the position of defects of a structure by vibration analysis. We used a concrete block as the structure and the defect is modeled by a vinyl sheet with a thickness of 200 mum. An array of sensors is attached on the surface of the concrete block, and a vibration pulse is forced using a small hammer. Since the forced vibration reflects at the position of a crack, the position will be estimated by picking up the reflection wave with an array of sensor using a beamforming technique. Since the power of the surface wave is much greater than that of the necessary reflection wave from the defect, the position of the defect could not been estimated correctly. So, we have developed a method to eliminate the useless surface wave, and a better estimation was achieved. But this method requires the restriction that a crack should be parallel to the surface. To avoid this restriction, we newly assume that the forced vibration reflects at the position of a crack and spherical wave is radiated to the sensors. Some experiments were carried out, and good results were obtained in the case that crack was slanting to the surface of the block.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Guoyue Chon, Masato Abe and Toshio Sone: "Improvement of the convergence characteristics of the ANC system with LMS algoritlm by reducing the effect of secondary paths" J.Acoust.Soc.Jpn.(E). 17・6. 295-303 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Otawara, N.Kubo, M.Abe, N.Tomitsuka, A.Ogawa, S.Hongo and M.abe: "Sonic and lysis for detection ofcervical and intercranial vascular disease" Neurologia medicc-Chiuurgica. 37・6. 453-458 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Abe: "Non-destructive esfmation of theposition of a crack in a concreta blockby eliminating the effect of surface wave" Proc.of Acoust.Soc.Am.and Acoust,Soc,Jpn Thind Joint Meeting. 797-802 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Abe: "Location of a defect in a concrete block by a non-destructive technigue" Proc,Int.Symp.on Simuletion,Visualization and Auralzation for Acoustie Research. 521-528 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Guoyue Chen, Masato Abe and Toshio Sone: "Improvement of the convergence characteristics of the ANC system with LMS algorithm by reducing the effect of secondary paths" J.Acoust.Soc.Jpn.(E). 17-6. 295-303 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yasunari Otawara, Naohiko Kubo, Miyuki Abe, Nobuhiko Tomitsuka, Akira Ogawa, Satoshi Hongo and Masato Abe: "Sonic analysis for detection of cervical and intercranial vascular disease" Neurologia medico-chirurgica. 37-6. 453-458 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masato Abe: "Non-destructive estimation of the position of a crack in a concrete block by eliminating the effect of surface wave" Proc.of Acoustical Society of America and Acoustical Society of Japan Third Joint Meeting. 797-802 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masato Abe: "Location of a defect in a concrete block by a non-destructive technique" Proc.of International Symposium on Simulation, Visualization and Auralization for Acoustic Research and Education. 521-528 (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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