Search Results 1-20 of 951

  • PROPOSAL OF ESTIMATION FORMULA OF TRUSS TOWER SUPPORTED STEEL CHIMNEY  [in Japanese]

    MIURA Keisuke , MATSUI Masahiro

    … Estimation of natural period is indispensable for evaluating dynamic behavior such as wind induced vibration and earthquakes. … One is experience formula, the other is theoretical formula. … On the other hand, the theoretical formula is a method for estimating 1st natural period from total mass and the truss tower stiffness, assuming truss tower supported chimney to one-degree-of-freedom model. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (758), 523-530, 2019-04

    J-STAGE  AIJ 

  • HAMS: A frequency-domain preprocessor for wave-structure interactions-Theory, development, and application

    Liu Yingyi

    … This paper presents the theoretical background, the numerical implementation, and the applications of a new software that has been developed in recent years for the analysis of wave-structure interactions. … The accuracy and the efficiency of the developed software are finally confirmed by numerical validations on three benchmark cases of a floating ellipsoid, a truncated circular cylinder and the OC4 DeepCwind semisubmersible floating wind turbine. …

    Journal of Marine Science and Engineering 7(81), 1-19, 2019-03-26

    IR 

  • Correct Understanding of Air Resistance in High School Physics : Through observation of wind tunnel device, theoretical analysis, drop experiment and data analysis  [in Japanese]

    増井 壮太 , 片岡 佐知子 , 中村 元彦 , 常田 琢 , 松山 豊樹

    空気抵抗は高等学校で学習する力学の分野の中で「物体の落下」という単元で取り上げられている。しかし、その内容としては、「空気抵抗は速度とともに増す。空気抵抗があることにより落下速度はやがて一定になる。」としか記載されていない。本研究において、風洞装置を用いて空気抵抗と速度の関係について調べた結果、30cm四方の厚紙にはたらく空気抵抗は速度の二乗におおよそ比例することがわかった。物体にはたらく空気抵抗 …

    次世代教員養成センター研究紀要 = Bulletin of Teacher Education Center for the Future Generation (5), 37-42, 2019-03

    IR 

  • Aerodynamic Property of Rectangular Cross Section Beam with Large Deflection by Self-Weight  [in Japanese]

    Nakato Seiji

    … <p>Aerodynamic Property of Rectangular Cross Section Beam with Large Deflection by Self-Weight was investigated using wind tunnel. … Wind load at fixed end and accelaration at free end were measured with parameter of wind speed and angle of attack. … Wind force slope around at 0° is 25% of theoretical value of plate wing. … Flutuating coefficient of wind force has maximumu value at -9° and 8°.</p> …

    Summaries to Technical Papers of Annual Meeting, Japan Association for Wind Engineering 2019(0), 145-146, 2019

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  • Application of double cylindrical tube having arbitrary twist distribution to twistable morphing wing and experimental demonstration  [in Japanese]

    ASO Atsushi , TANAKA Hiroaki , MIZOGUCHI Makoto

    … <p>The double cylindrical tube achieving an arbitrary twist distribution was applied to a spar of a twist morphing structure and the applicability was demonstrated through a twisting experiment and a wind tunnel test. … Then a theoretical formulation for the twist angle of the wing twist morphing structure considering its skin was derived. …

    Transactions of the JSME (in Japanese), 2019

    J-STAGE 

  • Experimental Investigation of Aerodynamic Characteristics of Magatama Type Vertical Axis Wind Turbine Blade Using Hele-Shaw Cell  [in Japanese]

    NINOMIYA Hiroki , YOSHIOKA Shuya

    … New wind turbine blade designed exclusively for vertical axis wind turbine (VAWT) is examined. … Obtained pressure distributions are in good agreement with theoretical values. …

    Journal of the Japanese Society for Experimental Mechanics 19(1), 44-51, 2019

    J-STAGE 

  • Geographic smoothing of solar photovoltaic electric power production in the Western USA

    Kelly Klima , Jay Apt , Mahesh Bandi , Paul Happy , Clyde Loutan , Russell Young

    … Our research questions were (1) how does geographic smoothing of commercial building rooftop PV compare to that of utility scale PV?, (2) is the geographic smoothing found for utility-scale plants the same for the western US as in India?, and (3) how does the geographic smoothing for PV compare to that of wind? …

    Journal of Renewable and Sustainable Energy 10(5), 053504, 2018-10-19

    IR 

  • Generalisation of the Two-Scale Momentum Theory for Coupled Wind Turbine/Farm Optimisation  [in Japanese]

    Nishino Takafumi

    … <p>An extended theoretical approach is proposed to predict the average power of wind turbines in a large finite-size wind farm. …

    PROCEEDINGS OF NATIONAL SYMPOSIUM ON WIND ENGINEERING 25(0), 97-102, 2018

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  • Evaluation of lift force generated by a Magatama-type wind turbine blade using Hele-Shaw  [in Japanese]

    NINOMIYA Hiroki , YOSHIOKA Shuya

    … <p>A wind turbine blade with a Magatama-type section is examined. … This blade specialize exclusively for vertical axis wind turbine. … This is compared with the theoretical pressure distribution. …

    The Proceedings of the Fluids engineering conference 2018(0), OS6-9, 2018

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  • OBSERVATIONAL, THEORETICAL AND NUMERICAL ESTIMATIONS ON WIND POWER POTENTIAL IN THE HIDA-GAWA RIVERSIDE AREA IN GIFU PREFECTURE, JAPAN

    Yoshino Jun , Ito Hiroshi , Kobayashi Tomonao

    … In this study, potential of wind power generation in the Hida-gawa riverside area is estimated by theoretical and numerical modellings with observational data. … In-situ campaign observations indicate that the 10-min wind speed in the riverside area is approximately 1.5 times larger than that in the landside area. … Theoretical estimation based on the conservation laws of mass, momentum and heat in a valley is in good agreement with the in-situ observations. …

    Grand Renewable Energy proceedings 1(0), 202, 2018

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  • The Effect of Wind Direction and Distance Between Axes on Two Rotating Straight Wing Vertical Axis Wind Turbines

    IKEDA Kanako , KUWANA Anna , NAGATA Yusaku , KAWAMURA Tetuya

    … Numerical simulation has been carried out for two-dimensional flow around two straight wing vertical axis wind turbines (SW-VAWT) with two blades. … We divide the flow region into two parts so that two wind turbines can rotate independently in the simulation. … one sub-region rotates together with the wind turbine and the other is fixed in the external space. …

    Theoretical and Applied Mechanics Japan 64(0), 61-66, 2018

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  • Morphology of Sand Dune with Vegetation Using a Numerical Simulation

    KATSUKI Atsunari

    … These shapes can be broadly classified by the complexity of the wind, the amount of sand and vegetation. …

    Theoretical and Applied Mechanics Japan 64(0), 163-168, 2018

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  • Verification and Stochastic System Analysis of Power-law Fluctuation Induced by Wind Power Interconnection  [in Japanese]

    ITO Kaito , HAYASHI Hikaru , KASHIMA Kenji , KATO Masakazu

    … <p>The statistical property of wind power fluctuation, which does not fit to the normal distribution because of its high probability of the extremal outlier, is regarded as a source of severe damage to power systems. … In view of this, the authors have proposed an evaluation method for the impact of wind power fluctuation on power system quality, assuming that this heavy-tailed uncertainty obeys a <i>power-law</i>. …

    Transactions of the Society of Instrument and Control Engineers 54(12), 878-885, 2018

    J-STAGE 

  • Influence of Wind Velocity on Measurement of Concrete Surface Roughness Using Aerial Ultrasonic Sensor  [in Japanese]

    NAGAOKA Seiya , OKAJIMA Kenji , ITO Ryoei , Mohammad RAIHANUL Islam , WATANABE Ken , ITO Tetsu

    … In this paper, we focused on the influence of wind velocity when using the aerial ultrasonic sensor. … We measured the peak to peak of the reflected wave by a wind tunnel experiment. … Consideration was given to the influence of wind velocity on the peak to peak, as well as the influence of wind on the estimate of arithmetical mean roughness, and the theoretical value and measured value were compared. …

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 86(2), I_197-I_204, 2018

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  • Vibration analysis of elevator rope with one vibration suppressor  [in Japanese]

    FUJITANI Takahiro , KIMURA Hiroyuki

    … <p>When an elevator rope for a high-rise building is forcibly excited by the displacements of the building induced by wind forces and/or by long-period ground motion, rope displacement becomes large even if the ground acceleration and the buildings acceleration is small. … In this paper, theoretical solution to the free vibration of the rope is obtained, in the case where the position of vibration suppressor is <i>L</i>/<i>N</i> …

    Transactions of the JSME (in Japanese) 84(864), 18-00048-18-00048, 2018

    J-STAGE 

  • Short-Term Prediction of Ship Responses in Actual Seas that Wind Waves and Swells coexist  [in Japanese]

    Miyake Seijiro , Naito Shigeru

    … When this method is used in actual seas where wind waves and swells coexist, a way to evaluate the wave spectrum must be studied more. … Such the wave field is usually expressed by overlapping two wave systems having different generation process and mutual independent property.</p><p>Usually, a wind wave is expressed by Pierson-Moskowitz spectrum and swell by JONSWAP spectrum. …

    Journal of the Japan Society of Naval Architects and Ocean Engineers 27(0), 57-65, 2018

    J-STAGE 

  • Vibration analysis of elevator rope with one vibration suppressor

    FUJITANI Takahiro , KIMURA Hiroyuki

    … <p>When an elevator rope for a high-rise building is forcibly excited by the displacements of the building induced by wind forces and/or by long-period ground motion, rope displacement becomes large even if the ground acceleration and the buildings acceleration is small. … In this paper, theoretical solution to the free vibration of the rope is obtained, in the case where the position of vibration suppressor is <i>L</i>/<i>N</i> …

    Transactions of the JSME (in Japanese), 2018

    J-STAGE 

  • Forced vibration analysis of elevator rope with one vibration suppressor  [in Japanese]

    KIMURA Hiroyuki , FUJITANI Takahiro

    … When an elevator rope of a high-rise building is forcibly excited by the displacements of the building, which are induced by the wind forces and/or by long-period ground motion, the rope displacement becomes large, even if the ground and the building acceleration are small. … Further, the resonant frequencies are compared to the natural frequencies obtained by theoretical analysis of the free vibration. …

    The Proceedings of the Elevator, Escalator and Amusement Rides Conference 2018(0), 105, 2018

    J-STAGE 

  • Electrical Characteristics of a Brushless Doubly-Fed AC Machine Equipped with Power Conditioning System Located in Rotor  [in Japanese]

    Hori Masahiro , Kusuno Nobuhiro , Kimura Mamoru

    … The flows of the prototype are the same as theoretical energy flows.</p> …

    IEEJ Transactions on Industry Applications 138(4), 368-375, 2018

    J-STAGE 

  • Experimental Study for Aerodynamic Performance of Quadrotor Helicopter

    NGUYEN Duc Hung , LIU Yu , MORI Koichi

    Wind tunnel experiments are performed to investigate the aerodynamic characteristics of a quadrotor helicopter in a uniform flow. … Moreover, it is found that the interference effect of the front rotor on the rear rotor can be predicted qualitatively using a theoretical formula on the basis of the Biot-Savart Law. …

    TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 61(1), 29-39, 2018

    J-STAGE 

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