論文 - 木本　和志

我が国の鋼橋の超音波探傷試験の現状とNDE4.0への展望(その2) 査読

木本和志, 白旗弘実, 中畑和之, 八木尚人, 判治剛

非破壊検査   2024年7月

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担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）  

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我が国の鋼橋の超音波探傷試験の現状とNDE4.0への展望(その1) 査読

木本和志, 白旗弘実, 中畑和之, 八木尚人, 判治剛, 服部雅史, 筒井康平

非破壊検査   73 ( 7 )   307 - 311   2024年7月

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担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）  

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畳込みニューラルネットワークを用いた2次元弾性波動場における欠陥の推定 査読

斎藤 隆泰, 木本 和志

AI・データサイエンス論文集   4 ( 3 )   265 - 273   2023年

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.11532/jsceiii.4.3_265

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き裂による散乱波の反響環境下での時間反転集束 査読

木本 和志, 斎藤 隆泰

土木学会論文集   79 ( 15 )   22-15007 - n/a   2023年

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担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejj.22-15007

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分子動力学法によるモンモリロナイト層間の水分子と陽イオンの分布解析

森本 逸紀, 木本 和志, 河村 雄行

土木学会論文集   79 ( 15 )   22-15038 - n/a   2023年

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担当区分：責任著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejj.22-15038

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分子動力学計算によるモンモリロナイトの水和エネルギー解析

森本 逸紀, 木本 和志, 河村 雄行

第64回粘土科学討論会講演要旨集   64   23 - 24   2021年9月

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担当区分：責任著者   記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）  

DOI： 10.11362/cssj2.64.0_23

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トポロジー感度を欠陥検出指標に用いた 3 次元動弾性時間反転解析による欠陥形状再構成 査読

斎藤 隆泰, 田代 匡彦, 木本 和志

土木学会論文集A2（応用力学）   77 ( 2 )   I_69 - I_79   2021年2月

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejam.77.2_i_69

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花崗岩の造岩鉱物粒スケールでみた弾性波伝播特性 査読

木本 和志, 岡野 蒼, 斎藤 隆泰

土木学会論文集A2（応用力学）   77 ( 2 )   I_81 - I_92   2021年2月

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担当区分：筆頭著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejam.77.2_i_81

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Study of a robotic system to detect water leakage and fuel debris-System proposal and feasibility study of visual odometry providing intuitive bird’s eye view- 査読

Zhenyu Wang, Gen Endo, Masashi Takahashi, Hiroyuki Nabae, Koichi Suzumori, Nobuyoshi Tsuzuki, Hideharu Takahashi, Kazushi Kimoto, Tomonori Ihara, Hiroshige Kikura

ROBOMECH Journal   7 ( 1 )   2020年12月

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担当区分：最終著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

<title>Abstract</title>To obtain the necessary information on fuel debris and water leakages during the decommissioning task of the Fukushima Daiichi Nuclear Power Plant, an ultrasonic-based method was proposed for future internal investigation of the primary containment vessel (PCV). In this article, we describe the rotatable winch mechanism and visual localization method, which were used to aid the investigation. We used the rotatable winch mechanism to adjust the height and orientation of the ultrasonic sensor and localized the robot with cameras to localize the sensor, to provide assisting information for data combination. We studied the feasibility of the conventional visual odometry method for application to the situation and performed localizing accuracy evaluation experiments with a mobile robotic platform prototype. The results showed that the visual odometry method could generate intuitive bird’s-eye-view maps, and provided an average error rate of 35 mm/1500 mm, which met the required maximum error rate of 100 mm/1500 mm for the grating movement. Experiments were also conducted with adjustable parameter ranges that could provide the required accuracy.

DOI： 10.1186/s40648-020-00184-z

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その他リンク： https://link.springer.com/article/10.1186/s40648-020-00184-z/fulltext.html

超音波計測に基づく花崗岩中の表面波伝播特性に関する研究 査読

木本 和志, 岡野 蒼, 斎藤 隆泰, 佐藤 忠信, 松井 裕哉

土木学会論文集,A2(応用力学)   76 ( 2 )   I_97 - I_108   2020年

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejam.76.2_i_97

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トポロジー感度を欠陥検出指標に用いた二次元動弾性時間反転解析とリニアアレイ探傷法への応用 査読

田代 匡彦, 斎藤 隆泰, 木本 和志

土木学会論文集A2（応用力学）   76 ( 2 )   I_15 - I_24   2020年

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担当区分：最終著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejam.76.2_i_15

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粗視化分子動力学法による水和モンモリロナイトの組織構造シミュレーション 査読

木本 和志, 河村 雄行, 牧野 仁史

19 ( 2 )   46 - 49   2020年

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.2477/jccj.2020-0006

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Wavefield データを利用した数値モデルの構築と時間反転イメージングへの応用 査読

中畑 和之, 天野 裕維, 溝田 裕久, 斎藤 隆泰, 木本 和志

土木学会論文集A2（応用力学）   75 ( 2 )   I_71 - I_81   2019年

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担当区分：最終著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejam.75.2_i_71

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不飽和多孔質体中の物質拡散に関する数値解析的研究 査読

木本 和志

土木学会論文集A2（応用力学）   75 ( 2 )   I_113 - I_124   2019年

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejam.75.2_i_113

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トポロジー感度を欠陥検出指標に用いた時間反転法の三次元マトリクスアレイ探傷法への応用 査読

斎藤 隆泰, 田代 匡彦, 森川 光, 木本 和志

土木学会論文集A2（応用力学）   75 ( 2 )   I_41 - I_49   2019年

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担当区分：最終著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejam.75.2_i_41

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Longitudinal and Shear Wave Velocities Measurement in Compacted Bentonite for Water Content

Shun Kimura, Kazumi Kitayama, Hideharu Takahashi, Kazushi Kimoto, Katsuyuki Kawamura, Hiroshige Kikura

E3S Web of Conferences   43   2018年6月

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掲載種別：研究論文（国際会議プロシーディングス）  

Bentonite is a good candidate of buffer material for disposal repository of high-level radioactive waste. Understanding groundwater behavior in bentonite buffer material is important in order to evaluate the bentonite buffer performance and guarantee long-term safety. Elastic constants of the bentonite buffer material are important parameters for the long-term safety. Water content in buffer material may have an influence on its elastic properties. For this reason, the monitoring system of the water saturation level in compacted bentonite is required. In this study, the ultrasonic velocity measurement method for evaluation of water content in compacted bentonite was proposed. At first, the effect of a degree of saturation in compacted bentonite on the longitudinal and shear wave velocities was investigated experimentally. In addition, the elastic property, bulk modulus, in unsaturated compacted bentonite were evaluated by ultrasonic velocities. As a result, it can be confirmed that ultrasonic velocities can evaluate a degree of saturation and bulk modulus of compacted bentonite.

DOI： 10.1051/e3sconf/20184301016

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トポロジー感度を欠陥検出指標に用いた時間反転法の超音波フェーズドアレイ探傷への応用

森川 光, 斎藤 隆泰, 木本 和志

土木学会論文集A2（応用力学）   74 ( 2 )   I_85 - I_93   2018年

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担当区分：最終著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejam.74.i_85

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接触音響非線形問題を対象とした有限要素解析技術の開発

木本 和志

土木学会論文集A2（応用力学）   74 ( 2 )   I_115 - I_123   2018年

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejam.74.i_115

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間隙水分布を考慮した不飽和多孔質体の熱伝導解析

中島 唯一, 木本 和志, 河村 雄行

土木学会論文集A2（応用力学）   74 ( 2 )   I_105 - I_114   2018年

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担当区分：責任著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejam.74.i_105

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Longitudinal and Shear Wave Velocities Measurement in Compacted Bentonite for Water Content

Shun Kimura, Kazumi Kitayama, Hideharu Takahashi, Kazushi Kimoto, Katsuyuki Kawamura, Hiroshige Kikura

ASTECHNOVA 2017 INTERNATIONAL ENERGY CONFERENCE   43   2018年

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：E D P SCIENCES  

Bentonite is a good candidate of buffer material for disposal repository of high-level radioactive waste. Understanding groundwater behavior in bentonite buffer material is important in order to evaluate the bentonite buffer performance and guarantee long-term safety. Elastic constants of the bentonite buffer material are important parameters for the long-term safety. Water content in buffer material may have an influence on its elastic properties. For this reason, the monitoring system of the water saturation level in compacted bentonite is required. In this study, the ultrasonic velocity measurement method for evaluation of water content in compacted bentonite was proposed. At first, the effect of a degree of saturation in compacted bentonite on the longitudinal and shear wave velocities was investigated experimentally. In addition, the elastic property, bulk modulus, in unsaturated compacted bentonite were evaluated by ultrasonic velocities. As a result, it can be confirmed that ultrasonic velocities can evaluate a degree of saturation and bulk modulus of compacted bentonite.

DOI： 10.1051/e3sconf/20184301016

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Ultrasonic measurement in variation of a degree of saturation in compacted bentonite 査読

Shun Kimura, Kazumi Kitayama, Kazushi Kimoto, Katsuyuki Kawamura, Hiroshige Kikura

Energy Procedia   131   428 - 435   2017年12月

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担当区分：最終著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

Bentonite, which is a kind of clay, is considered as a candidate for a buffer material in a geological repository of the high-level radioactive waste. Bentonite could provide long-term isolation of the radioactive waste because of its high adsorption capacity, low water permeability and good swelling property. In the context of long-term safety of disposal management, understanding groundwater behavior in bentonite buffer is one of the important issues, related to evaluating its long-term performance. In order to understand water behavior in compacted bentonite, the ultrasonic measurement was focused on. However, Ultrasonic wave propagation in compacted bentonite has not been understood well. Therefore, in this study, high spatial measurement system with Laser Doppler Vibrometer was developed in order to observe the ultrasonic wave propagation in compacted bentonite specimen. Ultrasonic wave propagation in compacted bentonite surface was measured. As a result, ultrasonic wave reflection was observed on the boundary between two different degrees of saturation. Thus, the capability of the developed system for investigation of the wave propagation in compacted bentonite is confirmed.

DOI： 10.1016/j.egypro.2017.09.417

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An elastodynamic computational time-reversal method for shape reconstruction of traction-free scatterers 査読

Kazushi Kimoto, Kazuyuki Nakahata, Takahiro Saitoh

Wave Motion   72   23 - 40   2017年7月

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.wavemoti.2016.12.007

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岩石材料中を透過する波動の位相特性 査読

佐藤 忠信, 木本 和志

土木学会論文集A2（応用力学）   73 ( 2 )   I_73 - I_84   2017年

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担当区分：最終著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejam.73.i_73

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A finite difference method for elastic wave scattering by a planar crack with contacting faces 査読

Kazushi Kimoto, Yasuaki Ichikawa

Wave Motion   52   120 - 137   2015年1月

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier BV  

DOI： 10.1016/j.wavemoti.2014.09.007

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充填構造を考慮した不飽和砂の熱伝導率発現機構に関する研究 査読

岩崎 佳介, 木本 和志

土木学会論文集A2（応用力学）   71 ( 2 )   I_595 - I_604   2015年

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担当区分：責任著者   記述言語：日本語   掲載種別：研究論文（学術雑誌）   出版者・発行元：公益社団法人 土木学会  

本研究は，不飽和砂を気-液-固相の三相周期多孔質媒体としてモデル化してマクロ熱伝導率を求め，飽和度と固相粒子の充填構造の違いが不飽和砂の熱伝導性に与える影響を数値解析により調べたものである．ここでは，3種類の充填構造について，間隙部に設けた液相領域の位置と大きさを変化させて熱伝導解析を行うことで，マクロ熱伝導率を飽和度の関数として求めた．その結果，充填構造の違いは，熱伝導率の絶対値に与える影響が大きいこと，液相領域の間隙内位置と量は，飽和度と熱伝導率の関係を大きく変化させることが明らかとなった．また，本研究で提案したモデルにより，既往の研究で知られている，熱伝導率と飽和度の関係を表す代表的な3種類の曲線形が，数値解析により再現可能であることが示された．

DOI： 10.2208/jscejam.71.i_595

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A new theoretical mineral dissolution rate equation for physicochemical factors 査読

CHOI JUNGHAE, ICHIKAWA YASUAKI, KIMOTO KAZUSHI, Chae Byung-Gon

GEOCHEMICAL JOURNAL   49 ( 5 )   549 - 557   2015年

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担当区分：最終著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：GEOCHEMICAL SOCIETY OF JAPAN  

The dissolution rate of minerals is affected by not only physical factors but also chemical factors, such as temperature, solid applied stress, pore water pressure and pH. In general, previous studies on mineral dissolution have dissociated these physical and chemical factors. In this paper, we propose a new dissolution rate equation for quartz dissolution that considers the physical and chemical effects of dissolution. Therefore, the reaction rate constant (k), which is the most important factor in the calculation of the reaction rate, was separated into three individual terms: temperature, solid applied stress and pore water pressure. Finally, the theoretical dissolution rate equation is proposed in this study; the equation contains all of the parameters that are related to the dissolution mechanism, such as temperature, solid applied stress at contact zone, pore pressure and pH conditions. To verify the proposed equation, it is compared with the experimental results, which were collected under various physical and chemical conditions; the equation is found to fit the experimental data well.

DOI： 10.2343/geochemj.2.0384

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Multi-species diffusion analysis in porous media under various dry density and temperature conditions: molecular dynamics simulation, homogenization analysis, and finite element method 査読

Jung Hae Choi, Katsuyuki Kawamura, Kazushi Kimoto, Yasuaki Ichikawa, Byung-Gon Chae

International Journal for Numerical and Analytical Methods in Geomechanics   38 ( 16 )   1744 - 1760   2014年11月

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担当区分：最終著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：Wiley  

DOI： 10.1002/nag.2303

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含水した砂質土の熱応答特性に関する 実験および数値解析 査読

岩崎 佳介, 木本 和志, 市川 康明

土木学会論文集 A2(応用力学)   70 ( 2 )   I_115 - I_124   2014年

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担当区分：責任著者   記述言語：日本語   出版者・発行元：Japan Society of Civil Engineers  

土壌は熱伝導率の大きく異なる三相から成るがそれらの構成比だけでなく形状によっても熱伝導率は変化する．本研究では砂質土の微視的な構造を三次元多孔質体モデルとして提案・作成し，熱伝導解析により熱伝導率の推定を行うとともに，豊浦砂を試料としてカラム供試体を作成し，室内実験と逆解析により試料の熱伝導率を推定することで，得られた熱伝導率と飽和度の関係から三次元モデルの妥当性を検討した．

DOI： 10.2208/jscejam.70.I_115

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リアルタイム波動伝搬シミュレータを援用した時間反転法による欠陥の映像化 査読

中畑 和之, 木本 和志, 廣瀬 壮一

非破壊検査 : journal of N.D.I   62 ( 9 )   467 - 468   2013年9月

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記述言語：日本語  

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Quartz dissolution experiments at various pH, temperature and stress conditions: CLSM and ICP-AES investigations 査読

Jung Hae Choi, Kazushi Kimoto, Yasuaki Ichikawa

Environmental Earth Sciences   66 ( 8 )   2431 - 2440   2012年8月

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担当区分：最終著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

DOI： 10.1007/s12665-011-1467-0

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その他リンク： http://link.springer.com/article/10.1007/s12665-011-1467-0/fulltext.html

Reconstruction of Flaws in Heterogeneous Media Using Image-Based FIT and Time Reversal Approach 査読

NAKAHATA Kazuyuki, KIMOTO Kazushi

Journal of Solid Mechanics and Materials Engineering   6 ( 6 )   771 - 781   2012年

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担当区分：最終著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：一般社団法人 日本機械学会  

Most commercial ultrasonic phased array systems implement B- and C-scan methods which use flight time and amplitude of flaw echoes. However, these methods are based on the fundamental ray-tracing theory in homogeneous media, and they are not directly applicable to heterogeneous media because of the complicated phenomenon of wave propagation. Time reversal techniques are adaptive methods that can be used in nondestructive evaluation to improve flaw detection in heterogeneous media. In this study, we propose a simulation-aided flaw imaging method based on the time reversal approach. Scattered waves from a flaw are recorded using an array transducer, and the time-reversed waves are re-emitted in the image-based FIT simulation. The re-emitted waves propagate through the heterogeneous media and focus on the flaw. The shape of the flaw can be visually estimated from the focal point of the ultrasonic wave in the simulation.

DOI： 10.1299/jmmp.6.771

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Real-time image-based FIT simulation using GPU computing and its application to nondestructive testing

Kazuyuki Nakahata, Kazushi Kimoto

ECCOMAS 2012 - European Congress on Computational Methods in Applied Sciences and Engineering, e-Book Full Papers   4285 - 4297   2012年

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

A signal prediction simulation tool for ultrasonic testing (UT) has been developed by combining the finite integration technique (FIT) with an image-based modeling approach. A realistic numerical model of a target can be made directly from digital images such as X-ray CT and three dimensional point cloud data. The image-based FIT for UT is accelerated using graphics processing units (GPUs) with Compute Unified Device Architecture (CUDA) Fortran. The methodology is described, and checked by numerical experiments using multiple GPU boards. The calculation speed can be dramatically improved compared to that obtained by running the same simulation on a conventional CPU. As an application of the image-based FIT, we propose a simulation-aided flaw reconstruction method for UT by means of the time reversal approach. Scattered waves from a flaw are recorded using an array transducer, and the time-reversed waves are re-emitted to numerical model in the FIT simulation. The re-emitted waves propagate through the heterogeneous media and focus on the flaw. The shape of the flaw can be visually estimated from the focal point of the ultrasonic wave in the simulation.

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斜角探傷用アレイ探触子を用いたFSAP方式による内部欠陥の超音波画像化 査読

中畑 和之, 竹内 裕幸, 木本 和志

日本機械学会論文集 A編   77 ( 779 )   1112 - 1122   2011年

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担当区分：最終著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Japan Society of Mechanical Engineers  

There is a phased array technique which makes use of flaw echoes, measured by every two-element combination as a pulser and a receiver, to synthesize high amplitude beams for any arbitrary angle and/or focal depth. Using this full waveform sampling and processing (FSAP) technique, we show a flaw reconstruction method for the angle beam phased array ultrasonic testing. In the case of the angle beam testing, it is necessary to estimate a beam path from a wedge to a specimen appropriately and to consider the mode conversion at the wedge-specimen interface. The main feature of our method is the use of processed wave data, called "scattering amplitude", which is extracted from each flaw echo. First, the basic principle of the reconstruction method is described and then some flaw reconstructions are demonstrated. The resolution of the flaw images and the accuracy of flaw sizing can be improved by means of the scattering amplitude.

DOI： 10.1299/kikaia.77.1112

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Flaw shape reconstruction using topological gradient for 2d scalar wave equation 査読

K. Kimoto, S. Hirose

REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOL 27A AND 27B   975   672 - 679   2008年

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：AMER INST PHYSICS  

This study is concerned with a non-linear inverse scattering technique called Time-Domain Topological Gradient (TDTG) for 2D wave equation. The TDTG is a recently developed shape optimization technique for elastodynamic problems with several potential advantages. The method, however, hasn't been used in the context of array ultrasonic imaging. In this study, performance of the TDTG is investigated numerically and experimentally by solving two example problems. The first is a numerical example in which a vertical slit in a plate is reconstructed from simulated data. The second one is a reconstruction from experimental data. Ultrasonic signals from a side-drilled hole in a steel block specimen are measured by an array transducer. The profile of the hole is reconstructed from those ultrasonic signals in the second problem. The results show that the TDTG can effectively use the phase focused beam fields, and very accurate in reconstructing not only a flat object but also a round one.

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動弾性有限積分法を用いた波動伝搬解析のための イメージベースモデリング 査読

中畑 和之, 木本 和志, 廣瀬 壮一

計算数理工学論文集   7 ( 2 )   No. 17-080317   2008年

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担当区分：最終著者  

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A Large Scale Simulation of Ultrasonic Wave Propagation in Concrete Using Parallelized EFIT 査読

NAKAHATA Kazuyuki, TOKUNAGA Jyunichi, KIMOTO Kazushi, HIROSE Sohichi

Journal of Solid Mechanics and Materials Engineering   2 ( 11 )   1462 - 1469   2008年

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担当区分：最終著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：一般社団法人 日本機械学会  

A time domain simulation tool for the ultrasonic propagation in concrete is developed using the elastodynamic finite integration technique (EFIT) and the image-based modeling. The EFIT is a grid-based time domain differential technique and easily treats the different boundary conditions in the inhomogeneous material such as concrete. Here, the geometry of concrete is determined by a scanned image of concrete and the processed color bitmap image is fed into the EFIT. Although the ultrasonic wave simulation in such a complex material requires much time to calculate, we here execute the EFIT by a parallel computing technique using a shared memory computer system. In this study, formulations of the EFIT and treatment of the different boundary conditions are briefly described and examples of shear horizontal wave propagations in reinforced concrete are demonstrated. The methodology and performance of parallelization for the EFIT are also discussed.

DOI： 10.1299/jmmp.2.1462

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A large scale analysis for ultrasonic wave propagation using parallelized FDTD method 査読

K. Nakahata, J. Tokunaga, K. Kimoto, S. Hirose

REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOL 27A AND 27B   975   107 - +   2008年

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：AMER INST PHYSICS  

A finite difference time domain method (FDTD) is based on a grid-based time domain differential technique, in which wave equations are solved in a leapfrog manner. It is required to discretize a whole target domain into computational grids with an adequate size. Therefore computational burden increases if the computational domain is much larger than the wave length. To solve such a large-scale problem in high speed, we apply a parallel computing technique to the FDTD. OpeuMP is an interface to execute program codes in parallel using a shared memory system of computers. As an example of large-scale analysis, SH wave propagations in concrete material are demonstrated in this study.

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Image-based sizing of surface-breaking cracks by SH-wave array ultrasonic testng 査読

KIMOTO K, UENO S, HIROSE S

Ultrasonics   45 ( 1-4 )   152 - 164   2006年12月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.ultras.2006.08.006

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SH波超音波リニアアレイ探触子の時間領域モデリング 査読

木本 和志, 廣瀬 壮一

土木学会応用力学論文集   9   115 - 121   2006年

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DOI： 10.2208/journalam.9.115

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A 3D linearized inverse scattering method for scatterers in a two layered medium 査読

Kazushi Kimoto, Sohichi Hirose

Structural Engineering/Earthquake Engineering   22 ( 2 )   201S - 207S   2005年

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

This paper presents a 3D linearized inverse scattering method for shape reconstruction of obstacles in a two layered medium. The problem here is to estimate the shape of an obstacle embedded in the bottom layer, using scattered waves observed at points in the top layer. Wave sources are assumed to be acoustic monopoles settled in the top layer. For this situation, two inversion formulas based on the Born and the Kirchhoff approximations are proposed with the help of the Green's function for the layered medium. In numerical examples, the two inversion formulae are tested for reconstruction of spherical and spheroidal rigid scatterers from simulated wave data. It is shown that an illuminated side of the scatterers is well reconstructed by the proposed methods.

DOI： 10.2208/jsceseee.22.201s

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A Green's function boundary element method for SH-wave scattering in an elastic layer

K Kimoto, S Hirose

REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 23A AND 23B   23 ( A )   118 - 125   2004年

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：AMER INST PHYSICS  

This paper concerns a boundary element method (BEM) for 2D SH-wave scattering in an elastic layer sandwiched by two half spaces. The BEM is based on the integral equation having a Green's function for a layer as its integral kernel. Since the Green's function satisfies the interface conditions, numerical integration in the BEM is necessary only on the surface of scattering objects, thus the computational memory can be saved greatly. On the other hand, numerical evaluation of the Green's function is critical and burdensome. In this paper, a hybrid ray-mode representation of the Green's function given by Kamel [2] is employed. Numerical aspects of the representation are discussed in some detail, and the BEM code with the Green's function is developed thereafter. As a numerical example, SH-wave scattering by a cavity in a layer is considered. Some numerical results to investigate the interaction between the cavity and layer interfaces are presented.

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Flaw shape reconstruction from SH-wave array ultrasonic data using time domain linearized inverse scatering method

Review of Progress in Quantitative Nondestructive Evaluation   24 ( A )   828 - 835   2004年

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数値シミュレーションを用いた開口合成法の欠陥形状再構成能に関する研究 査読

木本 和志, 松江 剛士, 廣瀬 壮一

応用力学論文集   7 ( 1 )   91 - 96   2004年

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記述言語：日本語   出版者・発行元：土木学会  

DOI： 10.2208/journalam.7.91

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入射場の放射パターンを用いるリニアアレイ探触子の設計変数決定法 査読

藤原 昌之, 木本 和志, 廣瀬 壮一

応用力学論文集   6   1089 - 1096   2003年

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記述言語：日本語   出版者・発行元：土木学会  

DOI： 10.2208/journalam.6.1089

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層状体に対するSH波のグリーン関数を用いた境界要素法 査読

境界要素法論文集   20   41 - 48   2003年

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A coupling method of boundary element method and generalized ray theory for elastic wave scattering in a thick plate

K Kimoto, S Hirose

REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 22A AND 22B   20 ( A )   41 - 48   2003年

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：AMER INST PHYSICS  

This paper presents a method for 3D elastic wave scattering analysis by an obstacle in a thick plate. The method is a coupling method of the boundary element method (BEM) and the generalized ray theory (GRT). For computational efficiency, the free field displacement in a plate is calculated by the GRT, and the solution is used as an incident field in the successive BEM analysis. The displacements or the tractions on the surface of the scattering object are obtained by the BEM. The boundary values obtained thus are then substituted into the integral expression of the scattered waves, in which the Green's functions are evaluated by the GRT to reduce computational cost further. As a numerical example, the scattering by a spherical cavity embedded in a plate is solved. The numerical results are shown for displacement waveforms as a function of time at points on the cavity and plate surface. Through the numerical example, benefit of the proposed method is discussed.

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Inversion of Vibration Mode of an Immersion Ultrasonic Transducer 査読

S. Hirose, K. Kimoto, H. Mizushima

Inverse Problems in Engineering Mechanics III   127 - 136   2002年

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担当区分：最終著者   掲載種別：論文集(書籍)内論文   出版者・発行元：Elsevier  

DOI： 10.1016/b978-008043951-8/50017-5

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A numerical modeling of contact SH-wave transducers

K Kimoto, S Hirose

REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 20A AND 20B   557 ( A )   821 - 828   2001年

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：AMER INST PHYSICS  

This paper discusses a numerical modeling of contact SH-wave transducers in conjunction with a BEM-based simulation technique for an ultrasonic testing. In the modeling, transmitters are modeled as distributed traction on the area of contact and receivers as a weight function to emulate averaging effect due to finite dimensions of receivers. The whole testing system is firstly formulated as an integral equation that involves the traction and the weight function. Using the integral equation, those unknown functions are then estimated from experimental data. In the last part of this paper, to examine validity of our modeling approach a numerical simulation of a pulse echo test is carried out and results are compared with experiments.

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Reflection and scattering analysis of SH-wave using a combined method of BEM and ray theory

Review of Progress in Quantitative Nondestructive Evaluation   19A   65 - 72   1999年

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