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最終更新日:2025/04/07
尾崎 宏樹
オザキ ヒロキ
(Hiroki Ozaki)
論文
- タイトル
- タイトル(英)
- Aerodynamic characteristics of new volleyball for the 2020 Tokyo Olympics
- 参照URL
- https://researchmap.jp/JISSHiro/published_papers/27659065
- 著者
- 著者(英)
- Sungchan Hong,Hiroki Ozaki,Keita Watanabe,Takeshi Asai
- 担当区分
- 概要
- 概要(英)
- The pattern of a modern volleyball is greatly different from that of a conventional volleyball, with several changes being made to the shape and design of the surface on the ball. Furthermore, at the 2020 Tokyo Olympics, a new volleyball (V200W; Mikasa) with 18 panels will be shown as the official ball. Therefore, this study compared the basic aerodynamic characteristics of conventional volleyballs with those of new designs in a wind tunnel. We used three full-size FIVB (Fédération Internationale de Volley-Ball) official volleyballs (V5M5000; Molten, MVA200; Mikasa and V200W; Mikasa) to determine the aerodynamic forces acting on each ball. The results indicate that the critical Reynolds number (Recr) differed depending on the ball types and their orientations. The Recr for the Molten ball (conventional) was determined to be ~3.4 × 105 (Cd = 0.17) on panel orientation A and ~2.7 × 105 (Cd = 0.14) on panel orientation B. Moreover, the Recr for the conventional Mikasa ball was determined to be ~2.6 × 105 (Cd = 0.14) on panel orientation A and ~3.0 × 105 (Cd = 0.13) on panel orientation B. On the other hand, the critical Reynolds number for the new volleyball (V200W) was ~2.9 × 105 (Cd = 0.17) in the panel orientation A and ~2.6 × 105 (Cd = 0.15) in panel orientation B. From these results, it can be hypothesized that, during a float serve, the flight trajectory will change depending on the type of volleyball and their orientation.
- 出版者・発行元
- 出版者・発行元(英)
- MDPI AG
- 誌名
- 誌名(英)
- Applied Sciences
- 巻
- 10
- 号
- 9
- 開始ページ
- 3256
- 終了ページ
- 3256
- 出版年月
- 2020年5月7日
- 査読の有無
- 査読有り
- 招待の有無
- 掲載種別
- 研究論文(学術雑誌)
- ISSN
- DOI URL
- https://doi.org/10.3390/app10093256
- 共同研究・競争的資金等の研究課題