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最終更新日:2024/03/07

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)
Hong Sungchan,Ozaki Hiroki,Watanabe Keita,Asai Takeshi
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
10
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
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