横山 佳之 YOKOYAMA Yoshiyuki

Articles:  1-8 of 8

  • Effect of seams on the aerodynamical properties of a hard baseball  [in Japanese]

    横山 佳之 , 高見 圭太 , 田中 潤一郎 , 宮嵜 武 , 姫野 龍太郎 , Yokoyama Yoshiyuki , Takami Keita , Tanaka Junichiro , Miyazaki Takeshi , Himeno Ryutaro

    第42回「境界層遷移の解明と制御」研究会(2008年3月31日-4月1日)資料番号: AA0064237024レポート番号: JAXA-SP-08-006

    宇宙航空研究開発機構特別資料: 境界層遷移の解明と制御研究会講演論文集(第41回・第42回) = JAXA Special Publication: Proceedings of the 41st and 42nd JAXA Workshops on Investigation and Control of Boundar-Layer Transition (JAXA-SP-08-006), 2009-02-27

    IR 

  • Drag Crisis of Gyro-balls  [in Japanese]

    YOKOYAMA Yoshiyuki , MIYAZAKI Takeshi , HIMENO Ryutaro

    高速度ビデオカメラを用いてピッチングマシンにより投球された硬式野球ボールの軌道と回転状態を撮影し,その映像を解析して抗力係数を求めた.市販のピッチングマシンをジャイロボール(ライフルスピンボール)が投球できるように改良し,測定に用いた.測定は0,6×10^5<Re<2.5×10^5およびスピンパラメーターSP≈0.12,0.23,0.35で行った.回転軸に対する相対的な縫い目(シ …

    Journal of Japan Society of Fluid Mechanics 27(5), 403-409, 2008-10-25

    References (14) Cited by (1)

  • Aerodynamic properties of NPB and MLB baseballs  [in Japanese]

    TANAKA Junichiro , TAKAMI Keita , YOKOYAMA Yoshiyuki , MIYAZAKI Takeshi , HIMENO Ryutaro

    Using a high-speed video camera, we measured the trajectory and the rotation of a hard baseball thrown by a pitching machine which can launch Gyro-balls (rifle spinning balls). We determined the drag …

    日本流体力学会年会講演論文集 2008, 284, 2008

    NDL Digital Collections 

  • Measurement of aerodynamics forces exerted on baseballs by a high-speed video camera  [in Japanese]

    丸山 純 , 横山 佳之 , 宮嵜 武 , 姫野 龍太郎 , Maruyama Jun , Yokoyama Yoshiyuki , Miyazaki Takeshi , Himeno Ryutaro

    資料番号: AA0063608009レポート番号: JAXA-SP-07-009

    宇宙航空研究開発機構特別資料: 境界層遷移の解明と制御研究会講演論文集 第39回 = JAXA Special Publication: Proceedings of the 39th JAXA Workshops on Investigation and Control of Boundary-Layer Transition (JAXA-SP-07-009), 27-30, 2007-12-28

    IR 

  • Drag Crisis and Negative Magnus Effect of a Hard-Baseball  [in Japanese]

    YOKOYAMA Yoshiyuki , HITOORI Kazuo , NAGAYAMA Emiko , MIYAZAKI Takeshi , HIMENO Ryutaro

    Using a high-speed video camera, we measured the trajectory and the rotation of a hard baseball thrown by a pitching machine. We measured the drag and lift coefficients by analyzing the video images. …

    日本流体力学会年会講演論文集 2007, 229, 2007

    NDL Digital Collections 

  • A16 Aero Dynamics Properties of a Hard-Baseball : Effects of Seam Pattern and Negative Magnus Force  [in Japanese]

    TAKAMI Keita , YOKOYAMA Yosiyuki , TANAKA Junichiro , MIYAZAKI Takeshi , HIMENO Ryutaro

    We investigated aerodynamic properties of a hard-baseball and a sphere by field experiments, in which we measure the trajectory of the projectiles using a high-speed video-camera. We determine the dra …

    The Proceedings of Joint Symposium: Symposium on Sports Engineering, Symposium on Human Dynamics 2007(0), 78-82, 2007

    J-STAGE 

  • A17 Drag Crisis of Gyro-Balls  [in Japanese]

    NAGAYAMA Emiko , YOKOYAMA Yoshiyuki , MIYAZAKI Takeshi , HIMENO Ryutaro

    Using a high-speed video camera, we measured the trajectory and the rotation of a hard baseball thrown by a pitching machine, which can launch a rifle spinning 'gyro-ball'. We determined the …

    The Proceedings of Joint Symposium: Symposium on Sports Engineering, Symposium on Human Dynamics 2007(0), 83-85, 2007

    J-STAGE 

  • AM06-25-003 Mesurement of Aerodybamics Forces Exerted on Baseballs through a High-Speed Video Camera 4  [in Japanese]

    YOKOYAMA Yoshiyuki , MARUYAMA Jun , TANIGUCHI Tetsuya , MIYAZAKI Takeshi , HIMENO Ryutaro

    Using a high-speed video camera, we measured the trajectory and the rotation of a hard baseball thrown by a pitching machine. We measured the drag and lift coefficients by analyzing the video images. …

    日本流体力学会年会講演論文集 2006, 353, 2006

    NDL Digital Collections 

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