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1999 Fiscal Year Final Research Report Summary

Research on the damage detection in the structure

Research Project

Project/Area Number 10650237
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Dynamics/Control
Research InstitutionNagoya University

Principal Investigator

KAWAI Tadao  Nagoya University, Engineering, Mechanical, Associate Prof., 工学研究科, 助教授 (20177637)

Project Period (FY) 1998 – 1999
KeywordsParameter Identification / Damage Detection / Structure
Research Abstract

In our previous researches, we proposed new techniques to identify parameters of a finite element model, i.e. the density and the modulus of elasticity, of two types of cantilever beam, by using an image processing technique. One beam was a combined beam, the other a damaged beam with a small crack. To identify the parameters of a small segment of the combined beam, spline smoothing with symmetrization and the weighted Tikhonov regularization technique were used. In addition, to detect the size and the location of a small crack, a new type of Simulated Annealing method was proposed.
In this research, we develop our technique to detect a damage in the two dimensional structure and to reduce the calculation time in the SA method.
We get following results.
(1) Instead of using the CM type FEM model, we reduced the calculation time by using the dynamic stiffness matrix dramatically.
(2) Using above technique, we can precisely estimate the location and magnitude of a small crack with less calculation.
(3) The semi-rotational stiffness coefficient was proposed as the index to represent the damage of the joint failure in the structure. After reducing the effect of noise in the image data, the precious semi-rotational stiffness coefficient was estimated.

  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 川合 忠雄 他2名: "構造物のヘルスモニタリング(第1報、構造部材のパラメータ同定)"日本機械学会Dgnamics&Design Conf'99講演論文集. Vol.B. 322-325 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tadao Kawai et.al: "Damage detedtion of structure using image processing"Int.Symposium on Inverse Problem 2000. 発表予定. (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tadao Kawai et al.: "Damage detection of structure using image processing"International Symposium on Inverse Problem 2000. (2000)

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

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Published: 2001-10-23  

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