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

全场非接触测温异常区域检测及数学分析反演

• 批准号: 23656086
• 负责人: KUBO Shiro
• 金额: $ 2.58万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23656086/
• 关键词: 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

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.

对于结构完整性的评估，检测和评估退化或异常的材料特性是非常重要的。如果能够全场测量与材料性质有关的物理量，就有可能建立一种可靠而精确的方法来估计材料性质的分布。在本研究中，我们提出了一种在一定的热条件下由二维全场温度分布估计热导率分布的方法。假设热通量在感兴趣的区域中几乎是恒定的，热导率从温度梯度估计。对方形区域导热系数的估算进行了数值模拟。导热系数的估计值与实际值吻合较好，但在导热系数突变点附近，导热系数的估计值出现恶化。由于该区域的通量不恒定，估计结果恶化。从温度梯度得到流线。流线之间的宽度用于修改热导率的估计值。结果发现，更好的估计热导率分布的流线的宽度。

项目成果

Inverse Analysis for Estimating Thermal Property from Full Field Measuremen

通过全场测量估算热特性的反演分析

• 发表时间: 2012
• 期刊: Proc. European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)
• 作者: Mitsumasa MAEKAWA;Shiro KUBO and Seiji IOKA;Takashi Sumigawa;Mitsumasa MAEKAWA
• 通讯作者: Mitsumasa MAEKAWA

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

最佳流体温度历史的逆分析方法，通过平滑应力强度因子的时间变化来最小化瞬态应力强度因子

• 发表时间: 2011
• 期刊: 日本機械学会第24回計算力学講演会講演論文集
• 作者: 松田和敏;池田徹;小金丸正明;宮崎則幸;Takashi Sumigawa;前川充匡
• 通讯作者: 前川充匡

Inverse Analysis for Estimating Thermal Property from Full Field Measurement

通过全场测量估算热特性的逆分析

• 发表时间: 2012
• 期刊: Proc. European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)
• 作者: Mitsumasa MAEKAWA;Shiro KUBO and Seiji IOKA
• 通讯作者: Shiro KUBO and Seiji IOKA

工学における逆問題とその数値解析例

工程反问题及其数值分析实例

• 发表时间: 2012
• 作者: Jia;Y.;Nishikawa;M.;Hojo;M.;久保司郎
• 通讯作者: 久保司郎