Search Results 1-20 of 1845

  • 鋼構造2層純骨組小模型の振動台実験の地震波加振レベルの違いによる応答比較  [in Japanese]

    木曽 翔太 , 岩井 哲

    … In order to investigate the safety on response level of steel structures under dynamic excitation as an earthquake, simple one-story and two-story steel pure-frame structure models were tested using a shaking table controlled by acceleration input of seismic wave. … The two-story frame structures with rigid roof and rigid floor consists of two types of columns: the one is "weak" first-story model and the other is "strong" first-story model. …

    広島工業大学紀要. 研究編 (42), 207-213, 39479-00-00

    IR 

  • DEVELOPMENT OF EVALUATION METHODOLOGY OF HUMAN INJURY DURING EARTHQUAKE BASED ON SEISMIC RESPONSE ANALYSIS MODEL OF HUMAN BODY  [in Japanese]

    ITO Kazuki , HIDA Takenori , ITOI Tatsuya , TAKADA Tsuyoshi

    … <p> The current seismic design mainly focuses on the performance of structure. … In order to ensure human safety during earthquakes, this study proposed an evaluation methodology of human behavior.</p><p> First, the relationship between human injury and floor response during earthquake is developed using a seismic analysis model of human body proposed by our previous study. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (767), 159-168, 2020-01

    J-STAGE  AIJ 

  • METHOD FOR ADDING HIGH FREQUENCY COMPONENTS TO A VELOCITY FIELD OBTAINED FROM A MESOSCALE METEOROLOGICAL MODEL:-Application of spatial filtering and rescaling method-  [in Japanese]

    KAWAI Hidenori , TAMURA Tetsuro

    … <p> Turbulent structure derived from meteorological disturbance with low-frequency fluctuation affects different characteristics for the distribution of wind pressure and the peak value of concentration in comparison with the inflow condition using turbulent boundary layer (TBL) over smooth or rough surface in usual cases. … However, it is impossible to resolve turbulent field around buildings explicitly and difficult to reproduce high frequency component by only the mesoscale meteorological model. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (767), 19-27, 2020-01

    J-STAGE  AIJ 

  • Analysis on Wave-Velocity Inverse Imaging for the Supporting Layer in Ballastless Track

    YANG Yong , LU Junwei , WANG Baoxian , ZHAO Weigang

    … To solve this problem, a method of elastic wave velocity imaging is proposed to analyze the concrete quality. … Then, a grid model is established to analyze the relationships among the grid wave velocity, travel route, and travel time. … A loss function based on the total variation is constructed, and an inverse method is applied to evaluate the elastic wave velocity in the supporting layer. …

    IEICE Transactions on Information and Systems E103.D(7), 1760-1764, 2020

    J-STAGE 

  • A method of calculating the leaking modes in elastic solid layered media  [in Japanese]

    Nishizawa Osamu , Saito Tatsuhiko , Inazaki Tomio

    <p>弾性固体で形成された層構造中を伝播するleaking mode(leakage mode, leaky mode)の計算法を提案し,固結度の低い軟弱地盤上の舗装道路を模したモデルについて予測分散曲線を示す。層構造を伝播するleaking modeはRayleigh波より速い速度で伝播する分散性の波で,下方無限の最下層に波のエネルギーを放出するため,振幅を減少させながら伝播する。一 …

    BUTSURI-TANSA(Geophysical Exploration) 73(0), 96-116, 2020

    J-STAGE 

  • Statistical and Spectral Analysis of the BulbT Conical Diffuser Flow

    Buron Jean-David , Houde Sébastien , Deschênes Claire

    … The three dimensional unsteady swirling flow inside the draft tube of a model bulb turbine is investigated using timeresolved stereoscopic particle image velocimetry. … This paper presents the experimental setup and provides a complete overview of the measurement campaign based on statistical and spectral analyses of the velocity fields and data from pressure sensors distributed across the draft tube. …

    International Journal of Fluid Machinery and Systems 13(1), 79-89, 2020

    J-STAGE 

  • Experimental study on two-dimensional cross-flow impeller with a minimal splitter plate instead of casings

    MIHARA Hiroaki , OKAMOTO Tetsuya , SUZUKI Keisuke , NOGUCHI Takashi , HIRATA Katsuya

    … <p>In the present study, the authors investigate the simplest model of cross-flow impellers, in order to provide the fundamental flow features of cross-flow impellers. … The model is a two-dimensional cross-flow impeller with a very-high aspect ratio, and rotates in stationary fluid. …

    Mechanical Engineering Journal 7(3), 19-00432-19-00432, 2020

    J-STAGE 

  • Limiting Conditions for Maintaining a Fixed Bed within a Coil-Shaped Rotating Spiral Gas–Solid Contacting Device under Gas Feeding  [in Japanese]

    Shimizu Tadaaki , Ohto Takashi , Li Liuyun , Hatta Akimichi , Kojima Toshinori

    <p>コイル状らせん構造を有し,らせん中心軸周りの回転運動で粒子を輸送する気固接触装置を提案した.内径24 mmの透明アクリル管で構成した多角形180°エルボを組み合わせ,1.5旋回のらせん構造のコールドモデルを製作した.らせん内の粒子固定層にガス(空気)を流通した.ガス流通は,粒子移動方向に対して向流と並流の2通りとした.ガス流量が少ないときはガス流量増加とともに圧損が増加したが,ガ …

    KAGAKU KOGAKU RONBUNSHU 46(3), 84-89, 2020

    J-STAGE 

  • GROUND MOTION PREDICTION EQUATION OF THE SEISMIC INTENSITY MEASURE TO EVALUATE STRUCTURAL DAMAGE TO HOUSES AND BUILDINGS FOR CRUSTAL EARTHQUAKES IN JAPAN  [in Japanese]

    ARAI Kensuke , SAKAI Yuki

    … The GMPE with the hypocentral distance underestimated near fault records.</p><p> </p><p> 2) We examined the influence of the velocity structure model and developed correction terms using deep sedimentary layers and shallow soft soils. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) 85(770), 475-484, 2020

    J-STAGE 

  • Resolvent analysis of turbulent channel flow with manipulated mean velocity profile

    UEKUSA Riko , KAWAGOE Aika , NABAE Yusuke , FUKAGATA Koji

    … <p>Using the resolvent analysis, we investigate how the near-wall mode primarily responsible for the friction drag is amplified or suppressed depending on the shape of the mean velocity profile of a turbulent channel flow. …

    Journal of Fluid Science and Technology 15(3), JFST0014-JFST0014, 2020

    J-STAGE 

  • Effects of Different Blade Numbers on Radial Exciting Force of Lobe Pump Rotor

    Li Yibin , Guo Dongsheng , Fan Zhaojing , Du Jun

    … turbulence model and PISO algorithm. … The internal flow characteristics in the pump are compared and the influence mechanism of the different blade numbers on the transient flow structure and the exciting force inside the rotor cavity are revealed. …

    International Journal of Fluid Machinery and Systems 13(2), 281-291, 2020

    J-STAGE 

  • Exploring the Behavior of a Coherent Flow Field Produced by a Shrouding Laval Nozzle Structure

    Liu Fuhai , Sun Dongbai , Zhu Rong , Hu Shaoyan

    … In this paper, a shrouding nozzle with a Laval nozzle structure using preheating technology is introduced. … A computational fluid dynamics model has been built to investigate the flow field of the coherent jet in simulation studies. …

    ISIJ International 60(4), 682-690, 2020

    J-STAGE 

  • Modeling a 3-D Velocity Structure around the Kashiwazaki-Kariwa Nuclear Power Plant for Evaluation of Long Period Strong Ground Motions  [in Japanese]

    HAYAKAWA Takashi , SHIMMURA Akihiro , HIKIMA Kazuhito , UETAKE Tomiichi

    <p>柏崎刈羽原子力発電所で蓄積された地震観測記録を用いて長周期地震動評価に用いる広域の三次元地下構造モデルを作成した.新潟地域を対象とした既存の三次元地下構造モデルをベースとして,敷地および周辺の物理探査結果を用いて敷地周辺の地下構造モデルの改良を行った.更に,発電所周辺で発生が想定される大地震の震源付近で発生した中小地震による周期2秒以上の地震動を三次元差分法によりシミュレーション …

    Journal of Japan Association for Earthquake Engineering 20(3), 3_1-3_20, 2020

    J-STAGE 

  • Statistical and Spectral Analysis of the BulbT Conical Diffuser Flow

    Buron Jean-David , Houde Sébastien , Deschênes Claire

    … The three dimensional unsteady swirling flow inside the draft tube of a model bulb turbine is investigated using timeresolved stereoscopic particle image velocimetry. … This paper presents the experimental setup and provides a complete overview of the measurement campaign based on statistical and spectral analyses of the velocity fields and data from pressure sensors distributed across the draft tube. …

    International Journal of Fluid Machinery and Systems 13(1), 79-89, 2020

    J-STAGE 

  • Macro-micro interaction mechanism between FRPC pile and sand under horizontal bidirectional load

    CAO Xiaolin , Dai Guoliang , Gong Weiming

    … Based on the particle image velocity measurement (PIV) technique, this paper studies the interaction between sand soil and FRPC pile by applying bidirectional horizontal load on the FRPC model pile embedded in sand soil. … In the process of loading the FRPC model pile, a CCD high-speed industrial camera is used to take gray image of sand deformation around the test observation surface pile. …

    Japanese Geotechnical Society Special Publication 8(7), 251-255, 2020

    J-STAGE 

  • Echocardiographic evaluation of cardiac function in cynomolgus monkeys over a wide age range

    NAKAYAMA Shunya , KOIE Hiroshi , PAI Chungyu , ITO-FUJISHIRO Yasuyo , KANAYAMA Kiichi , SANKAI Tadashi , YASUTOMI Yasuhiro , AGEYAMA Naohide

    … Echocardiography, electrocardiography, blood pressure and chest X-ray images were acquired under immobilization with intramuscular ketamine hydrochloride, then cardiac structure, function, and flow velocity were assessed. … In contrast, fractional shortening of the left ventricle, ejection fraction and flow velocity showed no significant correlations with weight or age, and age and E wave correlated negatively. …

    Experimental Animals, 2020

    J-STAGE 

  • An Application of Spectral Proper Orthogonal Decomposition to the Flow Field around a Rectangular Prism Building Model  [in Japanese]

    ZHANG Bingchao , OOKA Ryozo , KIKUMOTO Hideki

    <p>本研究は,スペクトル固有直交分解(SPOD)を用いて,角柱建物モデルの周辺における地表面に近い平面の風速場の乱流構造を解明することを目的としている.SPOD は,固有直交分解(POD)と離散フーリエ変換(DFT)の組み合わせで,最大の運動エネルギーを持っている物理現象を抽出することができる.研究の結果,計算から得られた固有関数は,カルマン渦を含み,色んな渦の時空間構造を示した.ま …

    SEISAN KENKYU 72(1), 65-70, 2020

    J-STAGE 

  • Study on Structure of Secondary Flow Vortex within Highly Loaded Turbine Cascade  [in Japanese]

    TSUTSUMI Masanori , WATANABE Norihiko , KINOSHITA Koichi

    … To realize the high-performance concept, experimental investigations to clarify the vortex structure near the enwall of a cascade by using smoke wire technique and PIV as a laser measurement system were carried out. … And also, CFD using LES model were conducted to analyze the vortices system in detail by comparing experimental results with calculation. …

    Journal of the Japanese Society for Experimental Mechanics 19(4), 332-340, 2020

    J-STAGE 

  • Design of Extended Kalman Filter for Discontinuous, Nonlinear Wiper System  [in Japanese]

    Haijima Takuji , Sano Shigenori , Kosugi Nobuhiko

    自動車用ワイパシステムの状態推定で,びびりの発生要因となるラバーとフロントガラス間の摩擦が不連続なため速度0[rad/s]付近で精度が悪化する.そこで,摩擦モデルの速度に依存しない静止摩擦項を外生入力としたことで,ヤコビアンの極大化が抑制され,拡張カルマンフィルタによる高精度な推定が可能となった.

    Transactions of Society of Automotive Engineers of Japan 51(1), 226-231, 2020

    J-STAGE 

  • Computation of non-linear site response by the time-domain finite-difference method  [in Japanese]

    鳥越 友輔 , 小松 正直 , 竹中 博士

    … We have developed a time-domain staggered-grid finite-difference code for modeling non-linear response of a one-dimensionally inhomogeneous subsurface structure to a SH plane-wave incidence. … It employs the velocity-stress formulation of elastodynamic equation for the linear part, and adopts a elastoplastic rheology model for the non-linear relation between the stress and strain. …

    Okayama University Earth Science Report 26(1), 1-17, 2019-12-27

    IR  DOI 

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