Search Results 1-20 of 371

  • SEISMIC DESIGN METHOD BASED ON SPECTRUM CAPACITY PROCEDURE FOR TIMBER SEMI-RIGID FRAME WITH OIL DAMPER  [in Japanese]

    SHINOHARA Masatoshi , ISODA Hiroshi

    … By comparing with numerical analysis and full scale shaking table experiments the accuracy has been verified. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (769), 355-365, 2020-03

    J-STAGE  AIJ 

  • A parallel Newton-type method for nonlinear model predictive control

    Deng Haoyang , Ohtsuka Toshiyuki

    … These equations are approximately decoupled into single-step subproblems along the prediction horizon for parallelization. … The coupling variable of each subproblem is approximated to its optimal value using a simple, efficient, and effective method at each iteration. … Numerical simulation of using the proposed method to control a quadrotor showed that the proposed method is highly parallelizable and converges in only a few iterations, even to a high accuracy. …

    Automatica (109), 2019-11

    IR 

  • APPLICATION OF MULTIPLICATIVE VISCOPLASTIC MODEL TO SIMULATION OF STEEL CREEP TESTS AT VARYING TEMPERATURE:Study on time-dependent behavior of structural steel at elevated temperatures Part 3  [in Japanese]

    OKABE Takeshi

    … order to simulate more closely the conditions existing in a real fire, the verification of viscoplastic model for varying temperature condition is need to be considered.</p><p> Secondly, in section 3, numerical simulations of the three kind of uniaxial tests under constant stress levels, [1] Creep tests at constant temperatures, [2] Creep tests under step-wise varying temperatures, [3] Creep tests under linearly increasing temperature change with temperature rate 5 oC/min, were carried out and the calculated results were compared with the …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (760), 897-903, 2019-06

    J-STAGE  AIJ 

  • STUDY ON INFLUENCE OF COMPUTATIONAL GRID RESOLUTION IN NUMERICAL SIMULATION OF UNSTEADY FLOW THAT TARGETS FLOW FIELD AROUND A ROOF:Fundamental study on prediction method of separation flow around building (Part 2)  [in Japanese]

    YAMADA Shinichi , YAMANAKA Toshio

    …  In numerical simulation of unsteady flow, since the spatial resolution of the velocity calculated at each time steps depends on the grid resolution, it is impossible to obtain the velocity fluctuation that smaller scale than the size of the calculational grid. …

    Journal of Environmental Engineering (Transactions of AIJ) (756), 179-186, 2019-02

    J-STAGE  AIJ 

  • A Study on Viscous Wave Drift Force on Semi-submersible and Prediction of The Extreme Value of Mooring Force  [in Japanese]

    Yukawa Kazuhiro , Kato Shunji

    … Then, the validity of a simulation model was verified by comparing the result of numerical simulation and the result of model test. … In addition, with regard to the safety evaluation of mooring force, we repeated Monte Carlo simulations using the same simulation model, and investigated the influence of number of samples and duration on the prediction of the extreme value of mooring force using different methods for extreme value statistical analysis.</p> …

    Journal of the Japan Society of Naval Architects and Ocean Engineers 30(0), 59-69, 2019

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  • A PROPOSAL OF EFFECTIVE REPAIR METHOD CONSIDERING REPAIR RATIO IN TUNNEL LIGHTING FACILITIES  [in Japanese]

    MAEDA Noriaki , KAWAMURA Kei

    <p> 社会基盤施設の維持管理は,点検等で把握した状態から事後の劣化状態を予測し,予防保全としての補修を実施するPDCA(Plan-Do-Check-Action)サイクルから成るアセットマネジメントシステムが有効である.その中で予防保全の補修は,施設の延命化に重要な役割を有している.本研究では,道路トンネル内に設置された照明設備の灯具を対象に点検結果では経過観察となる状態に対して,予 …

    Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics) 75(2), I_30-I_39, 2019

    J-STAGE 

  • Behavior of Solutions of Model-Free Prediction of the Differential Equation describing the Phenomenon using RNN  [in Japanese]

    Kinami Yuki , Endo Yasunori , Takayasu Akitoshi

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    Proceedings of the Fuzzy System Symposium 35(0), 185-190, 2019

    J-STAGE 

  • Prediction of Deformation Texture of FCC Metals Using Crystal Plasticity Self-consistent Model and Its Comparison with Prediction Based on Taylor's Uniform Strain Assumption  [in Japanese]

    OTSUKA Takayuki , TANAKA Yasuaki , SUWA Yoshihiro , USHIODA Kohsaku

    … <p>A viscoplastic self-consistent (VPSC) numerical model for deformation texture prediction been developed and applied to the plane strain compression problems of the high temperature austenite steels having fcc lattice structure. …

    Journal of the Society of Materials Science, Japan 68(11), 818-824, 2019

    J-STAGE 

  • STATISTICAL PREDICTION OF TIME SERIES OF WIND SPEED AND WAVE HEIGHT BY CONVOLUTIONAL NEURAL NETWORK  [in Japanese]

    ARAKI Yuji , MORI Nobuhito , YASUDA Tomohiro

    <p> 近年気候変動による影響評価研究が精力的に進められており,高潮や波浪の海象予測のニーズは高まっているが,力学モデルで高潮や波浪の長時間積分を行うには計算コストの問題がある.本研究では,深層学習(CNN: Convolutional Neural Network)を用いて空間的に気象情報を入力し,風速や波高といった海象の時系列を予測した.説明変数の組み合わせや気象場の入力範囲等の物 …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_139-I_144, 2019

    J-STAGE 

  • Wave Prediction in the Sea of Japan by Deep Learning Using Meteorological Data

    Tracey H. A. TOM , IKEMOTO Ai , MASE Hajime , KAWASAKI Koji , TAKEDA Masahide , KIM Sooyoul

    … <p> Numerical wave prediction models require a large amount of computational power to timely complete the required calculations. … Motivation for the examination of wave prediction by deep learning came from the success of CNNs in vision applications and the similarity of meteorological weather grid data to visual images. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_145-I_150, 2019

    J-STAGE 

  • <b>Predicted Rainfall Evaluation Method to Prevent Underestimation of Predicted Small River Flooding</b>

    FUKUHARA Takaaki , TAKAMI Kazuya , KAMATA Yasushi

    … In this system, synthetic precipitation volumes obtained by radar are input as past rainfall, while blended precipitation predictions obtained by combining numerical meteorological simulations and Nowcast, are input as future precipitation. …

    Quarterly Report of RTRI 60(2), 120-126, 2019

    J-STAGE 

  • Designed Wind Speed Evaluation Technique in Wind Turbine Installation Point by Using the Meteorological Model and CFD Model

    Uchida Takanori

    … We have been developing the unsteady numerical model called the RIAM-COMPACT (Research Institute for Applied Mechanics, Kyushu University, Computational Prediction of Airflow over Complex Terrain).The RIAM-COMPACT is based on the LES (Large-Eddy Simulation).The object domain of the RIAM-COMPACT is from several m to several km,and can predict the airflow and gas diffusion over complex terrain with highprecision. … A value of 61.9 m/s was obtained for the final design wind speed, Uh, in Approach 1. …

    Journal of Flow Control, Measurement & Visualization 6(3), 168-184, 2018-07-12

    IR 

  • SIMPLIFIED PREDICTION METHOD OF DISPLACEMENT MODE FOR TWO-STORY WOODEN STRUCTURE WITH ECCENTRICITY  [in Japanese]

    YAMAZAKI Yoshihiro , SAKATA Hiroyasu

    … The torsional interaction as stated above is likely to affect the displacement mode of wooden houses.<br> In this paper, prediction method of displacement mode for two-story wooden structure with eccentricity is proposed, and the applicability is discussed. … instead of solving eigen value equation. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (745), 467-477, 2018-03

    J-STAGE  AIJ 

  • RISK PREDICTION OF PROGRESSIVE COLLAPSE USING EVALUATION INDEX FOR STRUCTURAL STRENGTHS OF BUILDINGS  [in Japanese]

    AZUMA Kota , ISOBE Daigoro

    … The key element index is a parameter which indicates the contribution of a structural column to the vertical capacity of the structure.<br> By evaluating the numerical results using the allowable load ratio, it is found that the smaller the ratio, the higher the risk of progressive collapse. … By evaluating the numerical results using the key element index, it is found that the larger the sum of key element index, the higher the risk of progressive collapse; …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (744), 253-263, 2018-02

    IR  J-STAGE  AIJ 

  • SIMULATION OF CUTTING DEFORMATION IN MILLING PROCESS UNDER COUPLED THERMAL-MECHANICAL CONDITIONS

    Jin Hongyu , Wang Yang , Han Dedong

    Prediction of cutting deformation could effectively decrease surface errors of the part through optimizing tool path or cutting parameters. … According to the experimental results, the proposed simulation method could minimize the error between the calculation value and detection value in terms of workpiece deformation.</p> …

    Proceedings of the International Symposium on Flexible Automation 2018(0), 66-69, 2018

    J-STAGE 

  • REPRODUCTION OF FLUCTUATIONAL WIND FIELD NEAR GROUND BY USING WRF AND LES  [in Japanese]

    Maruyama Takashi , Izumi Tomohiro , Tamaki Maro

    <p>本研究ではWRFおよびキャノピーモデルを組み込んだLESにより地上付近の変動風速場の再現計算を試みた.LESによる計算では、キャノピーモデルにより地表面粗度として建物や植物を取り込むために必要となるパラメータをGIS上の数値データを用いて抽出する方法を提案した.観測記録のある台風1618号通過時の地上付近の変動風速場を再現し、格子解像度、地表面粗度としての建物と植物が計算結果に及 …

    PROCEEDINGS OF NATIONAL SYMPOSIUM ON WIND ENGINEERING 25(0), 31-36, 2018

    J-STAGE 

  • Hydrogen Concentration Behavior of y - Grooved Weld Joint Based on a Coupled Analysis of Heat Transfer - Thermal Stress - Hydrogen Diffusion  [in Japanese]

    OZEKI Go , YOKOBORI Jr. A. Toshimitsu , OHMI Toshihito , KASUYA Tadashi , ISHIKAWA Nobuyuki , MINAMOTO Satoshi , ENOKI Manabu

    … In this study, on the basis of proposed numerical analysis, behaviors of hydrogen diffusion and concentration during cooling process of y-grooved weld joint were analyzed and the mechanism of hydrogen induced cracking was investigated. … It was found that hydrogen concentrates at the position of the local maximum value of hydrostatic stress gradient. … Therefore, it was considered that prediction of hydrogen induced cracking becomes possible using this method of analysis.</p> …

    The Proceedings of Mechanical Engineering Congress, Japan 2018(0), J0120103, 2018

    J-STAGE 

  • Examination of the Reduced Reaction Mechanism for NOx Concentration Prediction in a Waste Incinerator  [in Japanese]

    DENDA Tomohiro , USUKI Taichi , UEKI Yasuaki , YOSHIIE Ryo , NARUASE Ichiro

    … We have developed the technique of numerical simulation which uses the reduced reaction mechanism to predict the combustion behavior in a waste incinerator. … (34 species, 76 reactions) for NOx concentration prediction by benchmarking GRI-Mech3.0 (50 species, 326 reactions) which is the typical combustion reaction mechanism. …

    The Proceedings of the Symposium on Environmental Engineering 2018.28(0), 205, 2018

    J-STAGE 

  • Prediction of Void Closure in Metal Forming: One Cylindrical Through-hole

    Park Jong-Jin

    … In plane-strain forging or rolling, a cylindrical void or through-hole was found experimentally as well as analytically to be closed as the effective strain at the center of the void reached a certain value. …

    ISIJ International 58(6), 1102-1107, 2018

    J-STAGE 

  • Coupled THMC Simulator Incorporating Pressure Solution with Dual Porosity Model and Its Application to Long-term Flow Simulation of Fractured Rocks  [in Japanese]

    OGATA Sho , YASUHARA Hideaki , KISHIDA Kiyoshi

    … By using the developed THMC numerical model, long-term prediction of rock permeability under simulated subsurface environments near the radioactive waste repository was conducted. … As a result of analysis, the permeability decreased by two orders of magnitude smaller than the initial value due to the pressure solution contacting asperities within fractures in the excavation distributed zone (EDZ). …

    Journal of the Society of Materials Science, Japan 67(3), 310-317, 2018

    IR  J-STAGE 

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