Updated on 2024/02/01

写真a

 
KIMOTO Kazushi
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
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Degree

  • Dr.Eng. ( 2007.6   Tokyo Institute of Technology )

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Civil engineering material, execution and construction management

Education

  • Tokyo Institute of Technology   理工学研究科   土木工学専攻

    - 2000

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    Country： Japan

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  • Tokyo Institute of Technology    

    - 2000

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  • Tokyo Institute of Technology    

    - 1997

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  • Tokyo Institute of Technology   工学部   土木工学科

    - 1997

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    Country： Japan

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Research History

  • Okayama University   環境生命科学学域   Associate Professor

    2021.4

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  • Okayama University   環境生命科学研究科   Associate Professor

    2008.4 - 2021.3

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  • - Tokyo institute of technology research associate

    2000

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  • - 東京工業大学 助手

    2000

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Professional Memberships

Committee Memberships

  • 土木学会 鋼構造委員会 鋼構造物における先進的非破壊検査・評価技術に関する調査研究小委員会   幹事長  

    2022.8 - 2025.7   

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    Committee type：Academic society

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  • 日本鉄鋼連盟土木鋼構造研究ネットワーク   中国・四国地区 代表幹事  

    2021.11 - 2023.11   

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    Committee type：Academic society

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Papers

  • 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 Reviewed

    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

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

    DOI： 10.11532/jsceiii.4.3_265

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  • TIME-REVERSAL FOCUSING OF ELASTODYNAMIC SCATTERED WAVES FROM A CRACK IN A REVERBERATING ENVIRONMENT Reviewed

    Kazushi KIMOTO, Takahiro SAITOH

    Japanese Journal of JSCE   79 ( 15 )   22-15007 - n/a   2023

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejj.22-15007

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  • ANALYSIS OF WATER MOLECULES AND CATIONS DISTRIBUTION IN MONTMORILLONITE INTERLAYER BY MOLECULAR DYNAMICS SIMULATIONS

    Itsuki MORIMOTO, Kazushi KIMOTO, Katsuyuki KAWAMURA

    Japanese Journal of JSCE   79 ( 15 )   22-15038 - n/a   2023

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    Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejj.22-15038

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  • Numerical study on the hydration energy of montmorillonite clay by molecular dynamics simulation

    I., Morimoto, K. Kimoto, K., Kawamura

    64   23 - 24   2021.9

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    Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

    DOI： 10.11362/cssj2.64.0_23

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  • SHAPE RECONSTRUCTION FOR A DEFECT USING 3-D ELASTODYNAMIC TIME-REVERSAL ANALYSIS WITH TOPOLOGICAL SENSITIVITY Reviewed

    Takahiro SAITOH, Masahiko TASHIRO, Kazushi KIMOTO

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   77 ( 2 )   I_69 - I_79   2021.2

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejam.77.2_i_69

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  • ELASTIC WAVE PROPAGATION IN A GRANITE AT A SCALE OF ROCK FORMING MINERAL GRAINS Reviewed

    Kazushi KIMOTO, Aoi OKANO, Takahiro SAITOH

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   77 ( 2 )   I_81 - I_92   2021.2

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    Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    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- Reviewed

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

    ROBOMECH Journal   7 ( 1 )   2020.12

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：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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    Other Link： https://link.springer.com/article/10.1186/s40648-020-00184-z/fulltext.html

  • A STUDY ON THE PROPAGATION CHARACTERISTICS OF SURFACE WAVES IN GRANITE BASED ON ULTRASONIC MEASUREMENTS Reviewed

    Kazushi KIMOTO, Aoi OKANO, Takahiro SAITOH, Tadanobu SATO, Hiroya MATSUI

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   76 ( 2 )   I_97 - I_108   2020

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejam.76.2_i_97

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  • 2-D ELASTODYNAMIC TIME-REVERSAL ANALYSIS USING TOPOLOGICAL SENSITIVITY AND ITS APPLICATION TO ULTRASONIC LINEAR ARRAY TESTING Reviewed

    Masahiko TASHIRO, Takahiro SAITOH, Kazushi KIMOTO

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   76 ( 2 )   I_15 - I_24   2020

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejam.76.2_i_15

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  • Texture Analysis of Water-Hydrated Montmorillonite Clay by Coarse-Grained Molecular Dynamics Simulation Reviewed

    Kazushi KIMOTO, Katsuyuki KAWAMURA, Hitoshi MAKINO

    Journal of Computer Chemistry, Japan   19 ( 2 )   46 - 49   2020

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Society of Computer Chemistry Japan  

    DOI： 10.2477/jccj.2020-0006

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  • A NUMERICAL STUDY ON THE MASS DIFFUSION IN UNSATURATED POROUS MEDIA Reviewed

    Kazushi KIMOTO

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   75 ( 2 )   I_113 - I_124   2019

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejam.75.2_i_113

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  • APPLICATION OF TIME-REVERSAL METHOD USING TOPOLOGICAL SENSITIVITY FOR DEFECT DETECTION TO 3-D MATRIX ARRAY TESTING Reviewed

    Takahiro SAITOH, Masahiko TASHIRO, Hikaru MORIKAWA, Kazushi KIMOTO

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   75 ( 2 )   I_41 - I_49   2019

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejam.75.2_i_41

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  • CONSTRUCTION OF NUMERICAL MODEL USING WAVEFIELD DATA AND ITS APPLICATION OF FLAW IMAGING BY TIME REVERSAL METHOD Reviewed

    Kazuyuki NAKAHATA, Yuui AMANO, Hirohisa MIZOTA, Takahiro SAITOH, Kazushi KIMOTO

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   75 ( 2 )   I_71 - I_81   2019

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejam.75.2_i_71

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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   2018.6

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    Publishing type：Research paper (international conference proceedings)  

    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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  • APPLICATION OF TIME-REVERSAL METHOD USING TOPOLOGICAL SENSITIVITY FOR DEFECT DETECTION TO ULTRASONIC PHASED ARRAY TESTING

    Hikaru MORIKAWA, Takahiro SAITOH, Kazushi KIMOTO

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   74 ( 2 )   I_85 - I_93   2018

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejam.74.i_85

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  • STUDY ON FINITE ELEMENT METHOD FOR DYNAMIC PROBLEMS INVOLVING CONTACT ACOUSTIC NONLINEARITY

    Kazushi KIMOTO

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   74 ( 2 )   I_115 - I_123   2018

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejam.74.i_115

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  • NUMERICAL HEAT CONDUCTION ANALYSIS OF UNSATURATED POROUS MEDIA CONSIDERING PORE WATER DISTRIBUTION

    Yuiichi NAKAJIMA, Kazushi KIMOTO, Katsuyuki KAWAMURA

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   74 ( 2 )   I_105 - I_114   2018

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    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

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：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 Reviewed

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

    Energy Procedia   131   428 - 435   2017.12

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：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 Reviewed

    Kazushi Kimoto, Kazuyuki Nakahata, Takahiro Saitoh

    Wave Motion   72   23 - 40   2017.7

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.wavemoti.2016.12.007

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  • PHASE CHARACTERISTICS OF WAVE PROPAGATING IN A ROCK MEDIUM Reviewed

    Tadanobu SATO, Kazushi KIMOTO

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   73 ( 2 )   I_73 - I_84   2017

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    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 Reviewed

    Kazushi Kimoto, Yasuaki Ichikawa

    Wave Motion   52   120 - 137   2015.1

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.wavemoti.2014.09.007

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  • STUDY ON THE THERMAL CONDUCTIVITY OF UNSATURATED SAND CONSIDERING THE PACKING STRUCTURE OF SOIL PARTICLES Reviewed

    Keisuke IWASAKI, Kazushi KIMOTO

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   71 ( 2 )   I_595 - I_604   2015

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    Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    In this study, the apparent thermal conductivity of unsaturated sand is simulated numerically modeling the sand as a periodic porous medium having immobile solid, fluid and gas phases. By varying the amount and location of the pore water, the thermal conductivity is obtained as a function of Sr (the degree of saturation) for three different sand particle packing structures. The numerical results show that the three typical relationships between the thermal conductivity and Sr, which are well known, but have been modeled poorly, can be well reconstructed by the present numerical approach.

    DOI： 10.2208/jscejam.71.i_595

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  • A new theoretical mineral dissolution rate equation for physicochemical factors Reviewed

    JungHae Choi, Yasuaki Ichikawa, Kazushi Kimoto, Byung-Gon Chae

    GEOCHEMICAL JOURNAL   49 ( 5 )   549 - 557   2015

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：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 Reviewed

    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   2014.11

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    DOI： 10.1002/nag.2303

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  • Experiment and numerical analysis of thermal response characteristics of unsaturated soil Reviewed

    K. Iwasaki, K.Kimoto, Y. Ichikawa

    Journal of applied mechanics   70 ( 2 )   I_115 - I_124   2014

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    Authorship：Corresponding author   Language：Japanese   Publisher：Japan Society of Civil Engineers  

    Soil consists of three phases that show significantly different thermal conductivity. The overall thermal conductivity depends not only on the phase composition but also the geometry. In this study, we made a 3-dimensional porous material model with a micro structure of the soil, and estimated the macroscopic thermal conductivity of the model by un upscaling heat conduction analysis. On the other hands, we carried out laboratory experiments aiming to estimate soils thermal conductivity by using column specimens of water content soil. Finally we verified the validity of the numerical model by comparing the experimental results with the numerical ones.

    DOI： 10.2208/jscejam.70.I_115

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  • Flaw lmaging by Time Reversal Method Using Real-time Ultrasonic Simulation Software Reviewed

    NAKAHATA Kazuyuki, KIMOTO Kazushi, HIROSE Sohichi

    62 ( 9 )   467 - 468   2013.9

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

    Jung Hae Choi, Kazushi Kimoto, Yasuaki Ichikawa

    Environmental Earth Sciences   66 ( 8 )   2431 - 2440   2012.8

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    DOI： 10.1007/s12665-011-1467-0

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    Other Link： 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 Reviewed

    Kazuyuki NAKAHATA, Kazushi KIMOTO

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

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Mechanical Engineers  

    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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  • Ultrasonic Flaw Imaging by the FSAP Technique Using Array Transducer for Angle Beam Testing Reviewed

    Kazuyuki NAKAHATA, Hiroyuki TAKEUCHI, Kazushi KIMOTO

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A   77 ( 779 )   1112 - 1122   2011

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：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 Reviewed

    K. Kimoto, S. Hirose

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

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：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 Reviewed

    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

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

    Kazuyuki NAKAHATA, Jyunichi TOKUNAGA, Kazushi KIMOTO, Sohichi HIROSE

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

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Mechanical Engineers  

    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 Reviewed

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

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

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：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 testing Reviewed

    K. Kimoto, S. Ueno, S. Hirose

    ULTRASONICS   45 ( 1-4 )   152 - 164   2006.12

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER SCIENCE BV  

    This paper presents calibration-free crack sizing techniques based on ultrasonic imaging. The techniques are intended for 2D (line) surface-breaking cracks with the size of the incident wavelength or greater. The probing wave mode is the anti-plane shear wave (SH-wave). Two methods are employed for the ultrasonic imaging. One is a synthetic aperture focusing technique (SAFT) and the other is a computed time-reversal focusing technique (TRFT). In this paper, those methods are modified so that crack tips are located directly from measured A-scope waveforms without any calibration experiments. The results are shown as a peak in the ultrasonic image created by the respective methods. Reasonable accuracies of the proposed techniques are demonstrated first for the sizing of slits with known depths. The techniques are applied thereafter to the sizing of fatigue cracks. Since fatigue cracks may not be open without an external load, ultrasonic measurements are taken with and without external loads. The results of the imaging show that the depths of open cracks can be estimated accurately. It is also shown that crack opening (closing) behavior can be deduced by observing appearance (disappearance) of the peak in the images indicating the crack tip. (c) 2006 Elsevier B.V. All rights reserved.

    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 Reviewed

    木本 和志, 廣瀬 壮一

    土木学会応用力学論文集   9   115 - 121   2006

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

    Kazushi Kimoto, Sohichi Hirose

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

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    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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  • 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

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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 Reviewed

    木本 和志, 松江 剛士, 廣瀬 壮一

    応用力学論文集   7 ( 1 )   91 - 96   2004

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    Language：Japanese   Publisher：土木学会  

    DOI： 10.2208/journalam.7.91

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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

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：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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  • 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 Reviewed

    境界要素法論文集   20   41 - 48   2003

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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

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：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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  • An optimization method for the design parameters of a linear phased array transducer using radiation pattern of the incident field Reviewed

    FUJIWARA M.

    Journal of Applied Mechanics,JSCE   6   1089 - 1096   2003

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  • Inversion of Vibration Mode of an Immersion Ultrasonic Transducer Reviewed

    S. Hirose, K. Kimoto, H. Mizushima

    Inverse Problems in Engineering Mechanics III   127 - 136   2002

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    Authorship：Last author   Publishing type：Part of collection (book)   Publisher：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

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：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

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MISC

  • Study on Effects of Coupled Phenomenon on Long-term Behavior for Crystalline Rock (FY2015) (Contract Research)

    JAEA-research   2016 ( 18 )   巻頭1 - 2,1-23   2016.12

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  • An Approach of Ultrasonic Flaw Imaging in Solid with the Time Reversal Method Assisted by an Image-based Simulation

    NAKAHATA Kazuyuki, KIMOTO Kazushi

    IEICE technical report   111 ( 88 )   1 - 6   2011.6

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    Language：Japanese   Publisher：The Institute of Electronics, Information and Communication Engineers  

    Time reversal techniques with an array transducer are adaptive methods that can be used in nondestructive evaluation to improve flaw detection through heterogeneous media. Here we propose a simulation-aided flaw imaging method combined with the time reversal approach. First scattered waves from a flaw are recorded in the signal matrix of the full-wave sampling and processing (FSAP) technique. Then the time-reversed waves are re-emitted in a numerical simulation. The simulation is based on the finite integration technique (FIT) and image-based modeling. The re-emitted waves propagate through the heterogeneous media and focus on the flaw. The flaw shape can be estimated visually in the simulation through the focal point of the ultrasonic wave.

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  • シミュレーション波形を使ったTDTG 法による欠陥形状再構成

    土木学会第61回年次学術講演会講演概要集 I   CDROM 1017-1018   2006

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  • 異方性を考慮した高精度な欠陥位置特定

    土木学会第61回年次学術講演会講演概要集 I   CDROM 647-64   2006

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  • TDTG法の欠陥形状再構成問題への適用性に関する基礎的検討

    日本非破壊検査協会平成18年度春季大会講演概要集   105 - 108   2006

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  • Evaluation of strength develpment in early age mortars using ultrasonic testing

    Proc. JSPS Int. Symp. on Environ. Eng. (SIDE2006)and 5th Regional Symp. on Infrastructure Development in Civil Eng. (RSID-5)   CD-ROM MTL-006   2006

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  • Ultrasonic imaging of flaws in steel by time-domain non-linear inverse scattering algorithm

    Proc. JSPS Int. Symp. on Environ. Eng. (SIDE2006)and 5th Regional Symp. on Infrastructure Development in Civil Eng. (RSID-5)   CD-ROM IND-010   2006

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  • FMBEMによる波動散乱シミュレーション

    首都圏大震災軽減のための実践的都市地震工学研究の展開 平成17年度成果報告シンポジウム予稿集   25 - 30   2006

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  • Evaluation of strength develpment in early age mortars using ultrasonic testing

    Proc. JSPS Int. Symp. on Environ. Eng. (SIDE2006)and 5th Regional Symp. on Infrastructure Development in Civil Eng. (RSID-5)   CD-ROM MTL-006   2006

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  • Ultrasonic imaging of flaws in steel by time-domain non-linear inverse scattering algorithm

    Proc. JSPS Int. Symp. on Environ. Eng. (SIDE2006)and 5th Regional Symp. on Infrastructure Development in Civil Eng. (RSID-5)   CD-ROM IND-010   2006

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  • リニアアレイ探触子を用いた超音波法による疲労き裂の画像化

    土木学会第60回年次学術講演会講演概要集   CD-ROM-I   170 - 171   2004

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  • Ultrasonic wave radiation from a linear phased array transducer

    Bridge Maintenance Safety, Management and Cost (Proc. 2nd Int. Conf. on Bridge Maintenance, Safety and Management   CDROM   S08-13   2004

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  • SH波のアレイ探傷データを用いた欠陥画像の再構成に関する研究

    土木学会第59回年次学術講演会講演概要集 I   CDROM-I   1209 - 1210   2004

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  • 1次元および2次元アレイ探傷データを用いた開口合成法による鋼材中模擬欠陥の画像化

    土木学会第59回年次学術講演会講演概要集   CDROM-I   257 - 258   2004

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  • Ultrasonic wave radiation from a linear phased array transducer

    Bridge Maintenance Safety, Management and Cost (Proc. 2nd Int. Conf. on Bridge Maintenance, Safety and Management   CDROM   S08-13   2004

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  • リニアアレイ探触子を用いた表面疲労き裂端部の検出

    日本非破壊検査協会 平成17年度春季大会講演概要集   17 - 20   2004

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  • 超音波探傷試験による欠陥形状再構成へのリニアサンプリング法の適用

    土木学会第60回年次学術講演会講演概要集   CD-ROM-I   573 - 574   2004

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  • 二層体中の散乱体に対する三次元線形化逆散乱解析 Reviewed

    木本 和志, 廣瀬 壮一

    土木学会応用力学論文集   5   75 - 80   2002

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    Language：Japanese   Publisher：土木学会  

    DOI： 10.2208/journalam.5.75

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  • A 3D Boundary Integral Equation Method for Ultrasonic Scattering in a Fluid-Loaded Elastic Half Space

    Review of Progress in Quantitative Nondestructive Evaluation   21 ( A )   43 - 50   2002

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  • Forward and inverse analysis of incident field from a contact ultrasonic transducer

    Proceedings of the 2nd international conference of structural stability stability and dynamics   2002

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  • A 3D boundary integral equation method for ultrasonic scattering in a fluid-loaded elastic half space

    K Kimoto, S Hirose

    REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION, VOLS 21A & B   615 ( A )   43 - 50   2002

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    Language：English   Publisher：AMER INST PHYSICS  

    This paper presents a boundary integral equation method for 3D ultrasonic scattering problems in a fluid-loaded elastic half space. Since full scale of numerical calculation using finite element or boundary element method is still very expensive, we formulate a boundary integral equation for the scattered field, which is amenable to numerical treatment. In order to solve the problem using the integral equation, however, the wave field without scattering objects, so-called free field need to be given in advance. We calculate the free field by the plane wave spectral method where the asymptotic approximation is introduced for computational efficiency. To show the efficiency of our method, scattering by a spherical cavity near fluid-solid interface is solved and the validity of the results is discussed.

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  • 水-固体半無限弾性体に対する動弾性グリーン関数の漸近近似を利用した3 次元境界要素法

    上辻良平, 木本和志, 廣瀬壮一

    土木学会第57回年次学術講演会講演概要集   CDROM:233-234   2002

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  • 板内部の欠陥形状の再構成

    第8回超音波による非破壊評価シンポジウム講演論文集   51 - 56   2001

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  • Numerical modeling of SH-wave ultrasonic nondestructive testing

    Proceedings of the first international conference of structural stability and dynamics, ICSSD 2000   543 - 548   2000

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  • Numerical modeling of SH-wave ultrasonic nondestructive testing

    Proceedings of the first international conference of structural stability and dynamics, ICSSD 2000   543 - 548   2000

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  • 波線理論と境界要素法を用いた定常SH波の散乱解析

    木本和志, 廣瀬壮一

    第6回超音波による非破壊評価シンポジウム講演論文集   43 - 44   1999

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  • 波線理論と境界要素法を用いたSH波の反射・散乱解析

    木本和志, 廣瀬壮一

    土木学会第54回年次学術講演会講演概要集第1部(A)   106 - 107   1999

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Awards

  • 応用力学論文賞

    2003  

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    Country：Japan

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Research Projects

  • 不飽和ベントナイトの水分浸透モニタリングを目的とした光音響トモグラフィー

    Grant number：22K04289  2022.04 - 2025.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    木本 和志

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    Grant amount：\3380000 （ Direct expense: \2600000 、 Indirect expense：\780000 ）

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  • Detection of the Non-Gaussian Phenomena in Civil Engineering Field and Development of Their Analytical Methods

    Grant number：21K04242  2021.04 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    佐藤 忠信, 木本 和志

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    Grant amount：\4030000 （ Direct expense: \3100000 、 Indirect expense：\930000 ）

    土木工学における非正規確率現象を発見し、それを抽出・解析するための方法論を開発し、近代確率過程論の枠組みを超越する新しい確率過程を構築するのが、本研究の主目的である。本年度は、観測加速度時刻歴のフーリエ位相スペクトルの確率特性が非ガウス性を示すことを明らかにした上で、その模擬法を開発し、それが長期記憶過程であることを明かにする。
    最初に、フーリエ位相スペクトルの確率特性が非ガウス性を示すことを明確にし、位相スペクトルの模擬法を確立した。応答スペクトル準拠の加速度時刻歴の形状はフーリエ位相スペクトルに大きく依存するので、観測地震動から位相平均勾配の確率特性を抽出し、それを用いて模擬されるフーリエ位相スペクトルを用い、応答スペクトル準拠の加速度時刻歴を模擬する方法論を確立した。また、初期フーリエ振幅スペクトルの与え方にも任意性が有るので、その設定法についても考察を加えた。多数の設計用応答スペクトル準拠の加速度時刻歴を模擬し、それらを用いて、フーリエ位相スペクトルの不確定性が構造物の非線形応答特性に及ぼす影響を評価した。
    次に、因果性を有する地震動加速度時刻歴のフーリエ変換の虚数部は、ヒルベルト変換を用いて実数部から再構築できることに着目し、加速度時刻歴を模擬できる方法論を開発した。まず、フーリエ変換・実数部の角振動数に関する変動特性を抽出し、それを実数部の「平均変動過程」とする。平均変動過程で実数部を除したものを「標準化実数部過程」と名付け、これが定常な確率過程となることを確認した。さらに，標準化実数部のサンプル過程を自己回帰過程として模擬した。その不確定性は自己回帰過程の予測誤差として評価した。模擬されたサンプル標準化実数部過程に変動過程を乗じて、サンプル実数部過程を求めた。さらに、ヒルベルト変換で虚数部過程を計算し、フーリエ逆変換で因果性を有する加速度時刻歴を多数模擬した。

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  • Exploration of stochastic phenomena disobeying the central limit theorem and development of innovative stochastic processes in the structural engineering

    Grant number：18K04334  2018.04 - 2021.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    SATO Tadanobu

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    Grant amount：\4290000 （ Direct expense: \3300000 、 Indirect expense：\990000 ）

    The purposes of this research are to discover phenomenon that is expressed by the non-Gaussian stochastic feature and to develop a new stochastic process transcends the frame of the modern stochastic theory. The candidate to detect the non-Gaussian feature is the phase spectrum of acceleration time history. There are three topics in this theme. The first is to make clear the non-Gaussian stochastic characteristic of the mean gradient of phase (an approximation of the group delay time). The next is to develop an algorithm to simulate the phase process, which is called as “the Levy flight process”. We applied this phase process to simulate design response spectrum compatible acceleration time histories. Using the simulated acceleration time history we evaluate nonlinear response characteristics of the structural system. The third is to develop a non-Gaussian stochastic differential equation for simulating the time history of acceleration. We discuss a method to solve this equation.

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  • Ultrasonic tomography for the evaluation of water and density of unsaturated clay

    Grant number：17K06534  2017.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Kimoto Kazushi

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    Grant amount：\4680000 （ Direct expense: \3600000 、 Indirect expense：\1080000 ）

    This study is concerned with the ultrasonic method for the evaluation of water content and bulk density of unsaturated clay. Since acoustic properties of unsaturated clay has not been investigated systematically, we performed ultrasonic transmission test on compacted bentonite clay of various water content and bulk density. As the result, it was found that the ultrasonic wave velocity is correlated highly with the dry density, while the ratio of P- to S-wave velocity increases with the degree of water saturation. The set of ultrasonic velocity data obtained thus can be used to invert ultrasonic data to the water saturation and the dry density. To investigate the feasibility of ultrasonic spectroscopy further, surface waves in heterogeneous clay samples are visualized by a scanning laser ultrasonic detector. The result is encouraging in the sense that the heterogeneity of the sample appears in the measured ultrasonic wave field as the variation in the wave speed.

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  • A study on ultrasonic attenuation mechanism in crystalline rock core sample

    Grant number：26420459  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Kimoto Kazushi, NISHIYAMA Satoshi

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    Grant amount：\4940000 （ Direct expense: \3800000 、 Indirect expense：\1140000 ）

    In this study, ultrasonic measurements and the signal processing were carried out aiming to understand the elastic wave propagation characteristics in a highly heterogeneous crystalline rock core samples. For the ultrasonic measurements, PZT and laser Doppler vibrometer were used. With the measurement setup, longitudinal (L), shear(S) and Rayleigh surface(R) waves transmitted through a cylindrical granite samples were measured. It was shown as the result, that the granite core behaves as an acoustically orthotropic material which can support a ballistic waves having the frequency components up to 500kHz. Another important finding is that the grain boundaries act as a relatively weak scatterer while strong scattering occurs at more sparsely distributed micro cracks.

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  • Ultrasonic nondestructive testing for surface-breaking crack on steel plates using leaky Lamb waves

    Grant number：23760427  2011 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    KIMOTO Kazushi

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    Grant amount：\3120000 （ Direct expense: \2400000 、 Indirect expense：\720000 ）

    This study is concerned with a development of ultrasonic non-destructive method for characterization of surface-breaking cracks on a steel plate using leaky Lamb waves, which is a kind of acoustic waves generated by guided-waves traveling in a fluid-loaded solid. To begin with, a simulation code was developed to analyze generation and propagation mechanisms of the leaky waves. A numerical inverse technique to identify surface-breaking crack was then proposed in conjunction with a guided wave mode-separation technique. Finally, a high-precision and resolution leaky wave measurement system was developed for future experimental validation of the proposed technique

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  • NON-CONTACT NONDESTRUCTIVE TESTING METHODS FOR INNOVATIVE MONITERING OF CIVIL ENGINNERING STRUCTURES

    Grant number：21360211  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    HIROSE Sohichi, KIMOTO Kazushi, SAITOH Takahiro

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    Grant amount：\14690000 （ Direct expense: \11300000 、 Indirect expense：\3390000 ）

    In the present research, two non-contact nondestructive ultrasonic methods of electromagnetic acoustic transducer(EMAT) and air-coupled ultrasonic method are considered. For these two non-contact ultrasonic methods, numerical codes of time domain boundary element methods are developed to investigate wave characteristics, which are verified in basic experiments. Also images of defects in experimental specimens are reconstructed from measured wave data by means of the synthetic aperture focusing technique(SAFT). Furthermore, an innovative inversion method is proposed for shape reconstruction of defects using guided waves in a plate.

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  • Highly Accurate Material Evaluation Using Acoustic Wave Measurement in Small Size Bore Holes

    Grant number：18360213  2006 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    HIROSE Sohichi, NAKAHATA Kazuyuki, KIMOTO Kazushi

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    Grant amount：\17790000 （ Direct expense: \15000000 、 Indirect expense：\2790000 ）

    本研究では, 超音波を用いた高精度な材料評価を目的として, まず, 演算子積分法時間領域多重極積分方程式, 異方弾性体に対する基本解, EFIT法の3つの効率的かつ高精度な波動解析技術を開発した. 次にボアホール内の波動場の数値シミュレーションを行なって漏洩表面波やガイド波の特性を明らかにし, 計測によって漏洩表面波を用いた材料評価の有効性を示した. さらにより高度な材料評価法としての線形化逆散乱解析とTG法を開発した.

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  • Research on nondestructive evaluation of inhomogeneous and anisotropic materials using highly accurate ultrasonic measurement

    Grant number：15360234  2003 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    HIROSE Sohichi, WIJEYEWICKREMA Anil C., KIMOTO Kazushi

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    Grant amount：\14800000 （ Direct expense: \14800000 ）

    In the present research, for the purpose of improving accuracy and reliability of ultrasonic nondestructive testing, fundamental characteristics of ultrasonic waves in inhomogeneous and/or anisotropic elastic solids are numerically analyzed, and material properties and defects in inhomogeneous and anisotropic solids are nondestructively evaluated by means of ultrasonic measurement with high accuracy.
    In numerical research of ultrasonic waves in solids, the following analyses were carried out ; 1. Boundary element analysis of scattering problems in anisotropic elastic solids, 2. Analysis of 3D scattering field by side-drilled hole and slit with uniform cross-section, 3. Multiple scattering analysis of elastic waves using fast multipole boundary element method, 4. Ultrasonic noise analysis by using multiple scattering approximation, and 5. Dispersion analysis of surface waves in a layered elastic solid.
    In the items 1 and 2, the boundary element methods with relevant fundamental solutions to concerned problems were developed and the items 3 and 4 are related to the multiple scattering analysis of a lot of inclusions in materials, which are numerical models for filaments of composite materials and grain boundaries in metals. In the item 5, the effect of an imperfect interface, on dispersive properties of time-harmonic extensional surface wave propagation in a pre-stressed symmetric layered composite was considered. These numerical analyses provided fundamental and valuable data for quantitative ultrasonic testing.
    In the researches of material evaluation, material damping of concrete was obtained, taking account of the energy loss in ultrasonic transducers and wave profiles, and a new optimal waveform, called matched pulse, in ultrasonic testing for concrete was proposed. Also inhomogeneity and anisotropy in steel plate were nondestructively evaluated by measuring leaky surface waves. In ultrasonic evaluation of defects, defect echoes were numerically simulated by means of multi-Gaussian beam method and 2.5D boundary element method, and some defect imaging methods like time reversal focusing and TDTG were applied to the ultrasonic array data.

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  • Development of Ultrascnic Flaw Detection System for Quantitative Evaluation of Fatigue Damage of Existing Steel Structures

    Grant number：15206055  2003 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    MIKI Chitoshi, HIROSE Soichi, SHIRAHATA Hiromi, YAMADA Masaki, SASAKI Eiichi, KIMOTO Kazushi

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    Grant amount：\44980000 （ Direct expense: \34600000 、 Indirect expense：\10380000 ）

    This study considered following items and show the possibility of developing UT system for quantitative evaluation.
    1. Development of a database for the fatigue crack detection in existing steel structures and consultation system based on the database :
    The database of the location, cause, and retrofit work of the fatigue damage was developed and it was showed that the importance of the detection of cracks from defect for the maintenance.
    2. Numerical simulation about characteristic of ultrasonic echo :
    In order to develop linear array flaw detection system, wave propagation simulation was carried out to optimize the arrangement of piezoelectoric device in proves. Then effective arrangement for 2 MHz and 5 MHz were proposed.
    3. Verification of the characteristics of ultrasonic echo from fatigue crack :
    It was showed that crack tip opening and closing behavior could be detected as the change of ultrasonic echo intensity non-destructively, and that possibility of fatigue crack identification by visualization using SAFT technique.
    4. Development of array ultrasonic flaw detection system :
    Three dimensional flaw detection systems in steel using tandem or two dimensional array probes were developed.
    5. Improvement of the accuracy of ultrasonic flaw detection systems by signal processing :
    Three dimensional visualization techniques with high objectivity and accuracy was developed. Accuracy of visualization to detect the location of crack tip by SAFT technique etc was evaluated.
    6. Verification by experiment using steel structural models :
    Ability of the weld defects detection was verified by using the model of steel bridge frame piers, which is fatigue problem was found recently, then it was checked that internal weld defects can be detected accurately even if the defect had three dimensional shapes.
    From the these results, it can be established that ultrasonic flaw detection system to evaluate fatigue damage objectively.

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  • フェーズドアレイ探触子の設計および制御法の最適化に関する研究

    Grant number：15760344  2003 - 2004

    日本学術振興会  科学研究費助成事業  若手研究(B)

    木本 和志

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    Grant amount：\3200000 （ Direct expense: \3200000 ）

    平成17年度は、以下の二項目の研究を行った。
    「アレイ探触子から発生する入射波動場の実験および数値シミュレーションによる解析」
    接触型、P波のアレイ探触子に対して、数値解析と実験により各素子から発生する入射波動場の解析を行った。実験では、板試験体に密着させたアレイ探触子から超音波を入射し、受信はハイドロフォンを用いた水浸法によって行った。計測結果は、高周波近似によって得られた近似理論解と比較を行い、隣接するアレイ素子の間でその程度は素子ごとに異なるものの、機械的な相互作用が発生していることが分かった。また、フェーズドアレイ探触子としてビーム合成を行ったときに、素子間の相互作用が入射波動場形成に与える影響についても調べ、正確なビーム制御には素子間相互作用を予め定量化しておくことが重要であることを示した。
    「開口合成法を用いたアレイ探傷データからの欠陥形状再構成」
    開口合成法は簡便でロバストな方法であるが、各種計測条件が画像化結果に与える影響については明らかでない部分が多い。そこで、リニアアレイ探触子によって板材内部の欠陥を探傷する場合に条件設定を絞り、探触子位置、素子間隔が開口合成結果に与える影響について数値シミュレーションによって調べた。その結果、素子間隔よりもアレイ探触子全体としての開口の大きさが重要であること、探触子位置によって再構成される欠陥境界の部位が変化すること、板裏面からの反射波の利用が画像化において有効であること等が分かった。実験的検討としては、SH波のリニアアレイ探触子を用意し、鋼材中模擬欠陥の形状再構成を行った。複数の位置でアレイ探触子を使って計測を行い、その結果を使って開口合成を行ったところ、シミュレーションで予め調べた知見を裏付ける結果が得られた。

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  • Development of simulator of ultrasonic waves in inhomogeneous and anisotropic body

    Grant number：13555128  2001 - 2003

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    HIROSE Sohichi, KIMOTO Kazushi, WIJEYEWICKREMA Anil c.

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    Grant amount：\4300000 （ Direct expense: \4300000 ）

    This research project aims at developing a numerical simulation tool of ultrasonic waves for accurate and efficient ultrasonic nondestructive evaluation of an inhomogeneous and anisotropic elastic solid. In simulation of ultrasonic waves, the numerical method has to be designed taking account of the following advantages; high accuracy and efficient computational cost, being capable of arbitrary shaped defects and outer boundaries, and mathematical modeling of all wave processes from transmission to receipt in ultrasonic testing. Using numerical data in simulation, an inverse analysis method also needs to be developed for visualization of defect shapes. For these purposes, intensive research has been done for the following subjects.
    1.Improvement of programming code of boundary element analysis for inhomogeneous and anisotropic elastic solid.
    A BEM code for scattering analysis of elastic waves in anisotropic elastic solid has been improved by carrying out the integration scheme more efficiently and using far-field expressions. Also a fast multiple boundary element nethod has been developed.
    2.Modeling of ultrasonic testing and development of combined method of BEM and ray theory
    Ultrasonic testing has been modeled by individual wave processes based on the time invariant linear system. For scattering process which is one of wave processes in ultrasonic testing, a combined method of BEM and Gaussian beam theory has been developed.
    3.Inverse scattering analysis in anisotropic solid.
    Linearized inverse scattering analysis has been developed for ultrasonic waves in anisotropic elastic solid and its applicability has been discussed.
    4.Ultrasonic testing for anisotropic elastic solid.
    Ultrasonic testing for high performance steel has been done to investigate the effect of acoustically anisotropic property on ultrasonic waves in steel.

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  • 接触法による超音波探傷試験データを用いた欠陥画像の再構成手法に関する研究

    Grant number：13750454  2001 - 2002

    日本学術振興会  科学研究費助成事業  若手研究(B)

    木本 和志

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    Grant amount：\2200000 （ Direct expense: \2200000 ）

    従来の線形化逆散乱解析では、画像化すべき欠陥が無限体中に存在するものとして定式化が行われてきた。この方法を入射波が平面境界を介して欠陥に到達するような場合にも拡張するには、定式化に修正が必要である。接触型探触子を用いた板材の探傷はそのような場合の一つであり、必要な修正を行うには1.接触型探触子の数値モデル化2.板材中の波動場の波線理論による解釈3.多重反射波の逆散乱解析への利用方法についての研究を行う必要がある。これらの三点に対し、本研究では次のような研究を行った。
    1.接触型探触子のモデル化
    接触型の斜角探触子までを対象として現実的な探触子のモデル化を可能とする方法について研究を行った。ここでは、探触子をそれと等価な表面力分布に置き換える従来のモデル化手法を採用しているが、具体的な分布の決定には実験的に測定した超音波の変位データから逆解析を行う方法を提案している。
    2.板材中の場の波線理論解による表現と物体波の抽出
    線形化逆散乱解析の定式化のためには、板材中の波動場を近似的には波線理論解により表現できることが前提となる。ここでは、どの程度そのような近似が可能かを明らかにするために必須となる、板材における弾性波の散乱解析プログラムの開発を行った。用いた手法は境界要素法と一般化波線理論の結合解法であり、三次元的な任意形状散乱体による散乱波の効率よい解析が可能である。
    3.屈折を受けて入射される波動の線形化逆散乱解析への利用
    板材における逆散乱解析では、直達波だけでなく反射波も用いることで送・受信角度の制限を緩和することが望ましい。本研究では、モード変換を伴った反射波までを利用できるよう、モード変換の影響を取り入れた新しい定式化を示した。さらに、ここで示した定式化により、数値解析データを用いて行ったいくつかの欠陥形状再構成例から、定式化の妥当性についても示すことができた。

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  • Development of quantitative low frequency ultrasonic testing and its application to nondestructive evaluation of concrete structures

    Grant number：12450182  2000 - 2002

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    HIROSE Sohichi, KITAHARA Michihiro, KIMOTO Kazushi, OTSUKI Nobuaki, NAGATA Yasuaki

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    Grant amount：\3000000 （ Direct expense: \3000000 ）

    The objective of this research is the development of quantitative low frequency ultrasonic testing in the range of several 10kHz to 100kHz, in which major topics are 1. fundamental properties of low frequency ultrasonic method, 2. numerical method for low frequency ultrasonic wave method and 3. application to concrete structures.
    1. Fundamental properties of low frequency ultrasonic method :
    Our review of papers related to ultrasonic transducers showed that there are few works on transducers producing low frequency ultrasonic waves. It was also found that commercial transducers for ultrasonic nondestructive testing of concrete are not designed under the optimum condition based on the wave theory. Applicability of laser vibrometer to nondestructive testing for concrete was investigated.
    2. Numerical method for low frequency ultrasonic testing:
    A low frequency ultrasonic wave method is applied to large-scale infrastructures. In numerical simulation of the ultrasonic testing, therefore, large-scale calculation is required. To this end, we developed a 2.5-D boundary element method and a fast multipole boundary element method, both of which are effective for large-scale wave analyzes.
    3. Application to concrete structures :
    Low frequency ultrasonic testing was applied to the evaluation of debonding on material interface and the evaluation of PC grouting. In the evaluation of interface debonding, an L-scan method with use of leaky surface waves was demonstrated as a better method than a conventional C-scan method. In the PC grout evaluation, the wavelet transform was used for the wave analysis obtained by impact-echo method and comparison between theory and experiment was carried out.

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  • Development of ultrasonic nondestructive evaluation for large and complex structural members

    Grant number：10555156  1998 - 2000

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B).

    HIROSE Sohichi, KIMOTO Kazushi, WADAKA Shusou

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    Grant amount：\5500000 （ Direct expense: \5500000 ）

    The aim of the present study is to develop a quantitative ultrasonic method for large complex structures. The following research topics have been investigated ; 1. Development of numerical codes for wave analysis of complex structure members, 2. Characteristic evaluation of ultrasonic transducers and incident wave fields, and 3. Application to experimental data. In the first topic, effective wave analysis methods, which combine a ray theory with a boundary element method or a finite difference method, have been developed. The ray theory is an approximation method in the high frequency range, which requires little computational effort if the scatterer has a simple geometric shape. On the other hand, numerical methods like boundary element method and finite difference method can be applied to analyze wave fields it arbitrary complex structures. In this study, the numerical methods of the boundary element method or the finite difference method were used to investigate the complex scattering phenomena by flaws, whereas reflection and transmission on simple outer boundaries were analyzed by the ray theory. In the second topic of the evaluation of ultrasonic transducers and incident waves, the inverse problem was formulated to estimate the vibration modes on the surface of an immersion transducer from observed waveforms. The problem is a typical inverse problem, in which the solution is sought to minimize the difference between theory and measurement. The Tikhonov regularization method was adopted to obtain a stable solution. In the third topic, the numerical methods developed in the first topic were applied to various experimental configurations including step, slit, welding flaw, defects in cylindrical bar and thick plate. Comparison between experiment and numerical results showed a good agreement. The flaw shapes were, furthermore, visualized by means of SAAF and linearized inverse method. It was shown that the resolution of the imaging of flaw shapes has been improved by taking account of multiple ray paths.

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  • Civil Engineering II （2020academic year） Second semester  - 金3,金4

  • Mechanics of Deformable Body I and Exercise （2020academic year） 3rd and 4th semester  - [第３学期]火6,火7,火8, [第４学期]金6,金7,金8

  • Mechanics of Deformable Body Ⅱ （2020academic year） 1st semester  - 月1,月2

  • Seminar on Applied Computational Structural Mechanics （2020academic year） Prophase  - その他

  • Seminar in Applied Computational Mechanics （2020academic year） Late  - その他

  • Seminar on Applied Computational Structural Mechanics （2020academic year） Late  - その他

  • Seminar in Applied Computational Mechanics （2020academic year） Prophase  - その他

  • Applied computational mechanics for environmental issues （2020academic year） Late  - その他

  • Structral Mechanics II （2020academic year） 1st semester  - 月1,月2

  • Structral mechanics IA （2020academic year） Third semester  - 火6,火7,火8

  • Structral Mechanics IB （2020academic year） Fourth semester  - 金6,金7,金8

  • Special Research （2020academic year） Year-round  - その他

  • Structural and Environmental vibration （2020academic year） Prophase  - 火1,火2,水1,水2

  • Environmental engineering mathematics I （2020academic year） 3rd and 4th semester  - [第３学期]火4,火5, [第４学期]火7,火8

  • Environmental engineering mathematics IA （2020academic year） Third semester  - 火4,火5

  • Environmental engineering mathematics IA （2020academic year） Fourth semester  - 火7,火8

  • Environmental engineering mathematics IB （2020academic year） Third semester  - 火4,火5

  • Environmental engineering mathematics IB （2020academic year） Fourth semester  - 火7,火8

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