Search Results 1-20 of 187

  • Gust response of bio-inspired flapping and revolving wings  [in Japanese]

    TANAKA Yuki , NODA Ryusuke , NAKATA Toshiyuki , Liu Hao

    … <p>Aiming at comparing the aerodynamic performance and gust response of the flapping and revolving wings, we performed a computational fluid dynamic analyses of flapping and revolving wings of a hawkmoth. … Therefore, we expect that the flapping wing is more steady and robust than the revolving wing under gust at same Re.</p> …

    The Proceedings of The Computational Mechanics Conference 2019.32(0), 159, 2019

    J-STAGE 

  • Development of high-performance rotary wings inspired by morphology and structure of animals  [in Japanese]

    ISHIBASHI Kenta , HIROSE Masaki , NODA Ryusuke , NAKATA Toshiyuki , LIU Hao

    Gust response of propellers are measured experimentally using 6-axis loadcell. … Through the experiments, it is found that the insect-inspired flexible propeller can suppress the unstable torque under gust by the passive wing deformation.</p> …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2019(0), 2A2-D05, 2019

    J-STAGE 

  • Development of flexible flapping mechanism inspired from musculoskeletal system of insects  [in Japanese]

    KOIZUMI Sakito , YOSHIDA Naoto , NAKATA Toshiyuki , LIU Hao

    … In this study, flexible flapping mechanisms were fabricated, and the effect of flexibility on the gust response was evaluated experimentally. … It was found that, while the flexibility in the mechanism can enhance the efficiency but reduces the stability, the wing flexibility can enhance the stability under the gust by the passive wing deformation. …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2019(0), 1P1-G02, 2019

    J-STAGE 

  • Vertical Gust Response Evaluation Method of a Cable-Stayed Bridge under Erection  [in Japanese]

    伊藤 靖晃 , 中島 穰 , 小林 秀人

    清水建設研究報告 95, 121-128, 2018-01

  • Simulation-based study on gust response of flexible insects  [in Japanese]

    NAKATA Toshiyuki , LIU Hao

    … While the flexibility in the driving mechanisms and the flapping wings are known to reduce the power consumption to generate the aerodynamic forces, their effects on the response to the aerodynamic disturbances attract less attention in spite of their capability to adjust the shape or kinematics of flapping wings passively in response to the air flow. …

    The Proceedings of The Computational Mechanics Conference 2018.31(0), 111, 2018

    J-STAGE 

  • Time-domain aeroelastic loads and response of wind turbine blades in gusty wind: prediction and experimental validation

    Sauder Heather Scot , Sarkar Partha P.

    形態: カラー図版あり資料番号: AA1630046073

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: Proceedings of the First International Symposium on Flutter and its Application (JAXA-SP-16-008E), 679-688, 2017-03-15

    IR 

  • Numerical simulation technique for aeroelastic response using inverse Fourier transform

    上田 哲彦 , 齊藤 健一 , Ueda Tetsuhiko , Saitoh Kenichi

    形態: カラー図版あり資料番号: AA1630046045

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: Proceedings of the First International Symposium on Flutter and its Application (JAXA-SP-16-008E), 421-430, 2017-03-15

    IR 

  • Study on identification of bridge deck flutter derivatives by gust response

    Lam Hoang Trong , 勝地 弘 , 山田 均 , Lam Hoang Trong , Katsuchi Hiroshi , Yamada Hitoshi

    形態: カラー図版あり資料番号: AA1630046022

    宇宙航空研究開発機構特別資料 = JAXA Special Publication: Proceedings of the First International Symposium on Flutter and its Application (JAXA-SP-16-008E), 217-225, 2017-03-15

    IR 

  • Stochastic identification of flutter derivatives of long span bridge deck by gust response

    Lam Hoang Trong , Katsuchi Hiroshi , Yamada Hitoshi

    構造工学論文集. A A 63, 421-429, 2017-03

  • Stochastic identification of flutter derivatives of long span bridge deck by gust response  [in Japanese]

    Lam Hoang Trong , Katsuchi Hiroshi , Yamada Hitoshi

    … In the study reported herein, the more challenging is the application of a system identification method to identify FDs from gust responses for the section model. … The gust response is obtained by an experimental wind tunnel test and simulation for a trussed deck section. … The results are also compared with those fromsmooth flow and free decay response. …

    Kozo Kogaku Ronbunshu. A (Journal of Structural Engineering. A) 63A(0), 421-429, 2017

    J-STAGE 

  • Study on flow field around a rectangular prism using DMD analysis  [in Japanese]

    Shimonishi Mai , Tsukamae Ikuma , Shirato Hiromichi

    矩形断面周りの流れ場において,スパン方向の空気力の空間相関は,接近流のスパン方向の相関より高くなることが知られている.この要因として,接近流から剥離せん断層に移る過程で流れの二次元化が促進されていることや,剥離バブルが流れ場に支配的であること等が提唱されている.しかし,その具体的なメカニズムは未だ明らかになっていない.<br />本研究では,<em> B</em> …

    Summaries to Technical Papers of Annual Meeting, Japan Association for Wind Engineering 2017(0), 131-132, 2017

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  • Gust Response Evaluation of PC Cable Stayed Bridge under Erection using Elastic Model Test and Gust Response Analysis  [in Japanese]

    Ito Yasuaki , Nakashima Yuzuru , Kobayashi Hideto , Sakai Yuki

    長大PC斜張橋の張出し施工時には耐風安定性の確保が課題となることがある.ガスト応答については部分模型実験による評価が難しく,弾性模型を用いた風洞実験かガスト応答解析により評価を行う必要がある.ガスト応答解析はコスト的なメリットが大きいものの,評価精度について十分な検証は行われておらず,依然として精度に課題を有している.そこで本研究では,弾性模型を用いた風洞実験結果とガスト応答解析結果を比較すること …

    Summaries to Technical Papers of Annual Meeting, Japan Association for Wind Engineering 2017(0), 185-186, 2017

    J-STAGE 

  • Aeroelastic Vibration of a Sheet under the Influence of Periodic Gust  [in Japanese]

    HIROAKI Keiichi , KATOU Daiki , WATANABE Masahiro

    … This paper describes vibration characteristics of a cantilevered flexible sheet subjected to a periodic gust. … In an experiment, active plates are set at the upstream part of a wind-tunnel and generate the periodic gust. … Moreover, a theoretical model to calculate a gust response using the Doublet-point method based on the unsteady lifting surface theory is developed. …

    The Proceedings of the Dynamics & Design Conference 2017(0), 115, 2017

    J-STAGE 

  • Modeling of Aerodynamic Characteristics of Drone and Improvement to Gust Response  [in Japanese]

    TORITA Raijo , KISHI Takuji , TOKUTAKE Hiroshi , SUNADA Shigeru , TANABE Yasutada , YONEZAWA Koichi

    … <p>Improvement of gust responses is required for the safe operation of the drone. … The developed model was applied to the response analysis of the gust input. … The sensitivities of the drone specifications to the gust responses were revealed, and the design guidelines were stated. … It will be applied to the gust alleviation control of the drone.</p> …

    The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2017(0), 1P1-R04, 2017

    J-STAGE 

  • Gust Flow Measurement of the JAXA's LWT2 System  [in Japanese]

    齊藤 健一 , 小池 俊輔 , 鈴木 幸一 , 岩崎 昭人 , Saitoh Kenichi , Koike Shunsuke , Suzuki Koichi , Iwasaki Akihito

    第48回流体力学講演会/第34回航空宇宙数値シミュレーション技術シンポジウム (2016年7月6日-8日. 金沢歌劇座), 金沢市, 石川形態: カラー図版あり資料番号: AA1630031018

    宇宙航空研究開発機構特別資料: 第48回流体力学講演会/第34回航空宇宙数値シミュレーション技術シンポジウム論文集 = JAXA Special Publication: Proceedings of the 48th Fluid Dynamics Conference / the 34th Aerospace Numerical Simulation Symposium (JAXA-SP-16-007), 147-150, 2016-12-27

    IR 

  • Wind Analysis in a Ropeway Installation and Simulation of Carrier Response to Wind Gust  [in Japanese]

    SATO Hisao , OSHITATE Takashi , MORI Hirotaka , HIROSE Michio

    … <p>This paper describes wind analysis results in a ropeway installation and simulation results of carrier responses to wind gust. … One of the accident causes is pointed out to be wind gust. … In addition, simulation results are reported for carrier swing when wind gust acted to the carrier. … Finally this paper provides control charts to wind gust in this ropeway installation.</p> …

    The Proceedings of the Transportation and Logistics Conference 2016.25(0), 1208, 2016

    J-STAGE 

  • Preliminary Study of Gust Response Evaluation of Drones via Free-Flights in Gust Wind Tunnel  [in Japanese]

    KUBO Daisuke

    … However, there is no standard for the performance evaluation of gust tolerance. … In this study, free flight gust response testing method using a motion capture based precise flight control is proposed. … A prototype of the tesing system using JAXA's low-speed wind tunnel (LWT2) was constructed, and gust response free flight demonstration was carried out successfully.</p> …

    The Proceedings of the Transportation and Logistics Conference 2016.25(0), 2302, 2016

    J-STAGE 

  • Identification of Flutter Derivatives from Gust Response of Trussed Bridge Deck  [in Japanese]

    Trong Hoang Lam , Katsuchi Hiroshi , Yamada Hitoshi

    本論文はトラス橋桁を対象にガスト応答波形から非定常空気力係数を同定する手法の検討を行ったものである.非定常空気力係数の同定においては,システム同定手法を用いることとし,通常の自由振動法による結果とも比較した.また,本手法を用いて,橋桁に作用する乱流強度が非定常空気力係数に及ぼす影響についても検討を行った.

    PROCEEDINGS OF NATIONAL SYMPOSIUM ON WIND ENGINEERING 24(0), 187-192, 2016

    J-STAGE 

  • A Linear Array of Wind and Pressure Sensors for High Resolution in situ Measurements in Winter Tornadoes

    Kusunoki Kenichi , Arai Ken-ichiro , Kato Ryohei , Sato Eiichi , Fujiwara Chusei

    … The Shonai area railroad weather project has investigated fine-scale structure of wind gust dynamics and kinetics such as tornadoes, downbursts, and gust fronts. … Wind data are obtained using 12 two- dimensional fast-response ultrasonic anemometers placed at a height of 5 m at intervals of 100 m. …

    IEEJ Transactions on Fundamentals and Materials 136(5), 286-290, 2016

    J-STAGE 

  • CONSIDERATION OF OVERTURNING RISK FOR RUNNING VEHICLES DUE TO CROSSWINDS  [in Japanese]

    TACHIBANA Takashi , SHIRATO Hiromichi , OKAMOTO Mitsuki , WADA Kohei , ZHANG Dongming , SUMI Kazuo , YAGI Tomomi , HATTORI Hiroshi , KOGA Mitsuhiko

    強い横風に起因する車両の横転事故は今もなお全国各地で発生している.本稿は走行中の大型車が横風により転倒する際,車両へ作用する空気力に着目することで,風特性・車両特性相互の視点から総合的に車両横転のメカニズムを解明することを目的とした.地面による風速欠損の影響を考慮した空気力係数,及び現地の風特性に基づく閾値超過確率を踏まえたガストファクターを算出し,また角運動方程式による横転発生時の風況検討,風洞 …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 72(1), 220-233, 2016

    J-STAGE 

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