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Detection of Abnormal Regions by Full-Field Non-Contact TemperatureMeasurement and Inverse Analysis with the Aid of the MathematicalAnalysis

Research Project

Project/Area Number 23656086
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Materials/Mechanics of materials
Research InstitutionOsaka University

Principal Investigator

KUBO Shiro  大阪大学, 大学院・工学研究科, 教授 (20107139)

Co-Investigator(Kenkyū-buntansha) SAKAGAMI Takahide  神戸大学, 大学院・工学研究科, 教授 (50192589)
IOKA Seiji  大阪電気通信大学, 工学部, 准教授 (50283726)
Project Period (FY) 2011 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords非破壊評価 / 構造健全性 / 逆解析 / フルフィールド計測 / 異常部位検出 / 温度 / 温度場計測 / 逆問題 / 熱伝導度推定
Research Abstract

For the assessment of structural integrity, the detection and evaluation of deteriorated or anomalous material properties are very important. If full field measurement of some physical quantity related to the material property is available, it is possible to construct a robust and accurate method for estimating the distribution of material properties.In this investigation, we propose a method for estimating thermal conductivity distribution from two-dimensional full field temperature distribution under certain thermal conditions. Assuming that heat flux is nearly constant in the region of interest, thermal conductivity is estimated from the temperature gradient. Numerical simulations were made of the estimation of thermal conductivity in a square region. The estimated distribution of thermal conductivity agreed reasonably with the actual one, while the estimation deteriorated around a point where thermal conductivity showed abrupt change. The estimation deteriorated due to the fact that the flux was not constant in the region. Streamlines were obtained from the temperature gradient. The width between streamlines was used for modifying the estimated value of thermal conductivity. It was found that a better estimation of the thermal conductivity distribution was made by using the width of streamlines.

Report

(3 results)
  • 2012 Annual Research Report   Final Research Report ( PDF )
  • 2011 Research-status Report
  • Research Products

    (5 results)

All 2012 2011

All Journal Article (3 results) (of which Peer Reviewed: 2 results) Presentation (2 results)

  • [Journal Article] Inverse Analysis for Estimating Thermal Property from Full Field Measurement2012

    • Author(s)
      Mitsumasa MAEKAWA, Shiro KUBO and Seiji IOKA
    • Journal Title

      Proc. European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)

      Volume: No. 3496 Pages: 1-11

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Inverse Analysis for Estimating Thermal Property from Full Field Measuremen2012

    • Author(s)
      Mitsumasa MAEKAWA
    • Journal Title

      Proc. European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)

      Volume: Paper No. 3496 Pages: 1-11

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 応力拡大係数の時間的変化の平滑化による過渡的応力拡大係数を最小化する最適な流体温度履歴に関する逆解析手法2011

    • Author(s)
      前川充匡
    • Journal Title

      日本機械学会第24回計算力学講演会講演論文集

      Volume: No.11-3 Pages: 1-2

    • Related Report
      2011 Research-status Report
  • [Presentation] Inverse Analysis for Estimating Thermal Property from Full Field Measurement2012

    • Author(s)
      Mitsumasa MAEKAWA, Shiro KUBO and Seiji IOKA
    • Organizer
      European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)
    • Place of Presentation
      Vienna, Austria
    • Related Report
      2012 Annual Research Report 2012 Final Research Report
  • [Presentation] 工学における逆問題とその数値解析例2012

    • Author(s)
      久保司郎
    • Organizer
      研究集会「数値計算・数値解析と逆問題 ―これまでとこれから―」(招待講演)
    • Place of Presentation
      岡山理科大学(岡山)
    • Related Report
      2011 Research-status Report

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Published: 2011-08-05   Modified: 2019-07-29  

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