著者
酒井 忍 保富 大輔 史 金星 浦上 晃 溝口 正人
出版者
一般社団法人 日本機械学会
雑誌
日本機械学会論文集 (ISSN:21879761)
巻号頁・発行日
vol.85, no.877, pp.19-00118, 2019 (Released:2019-09-25)
参考文献数
19

In rubber baseball games, when the rubber ball is hit by a baseball bat, the rubber ball is deformed greatly comparing to an official baseball ball, and the batted ball speed decreases due to the energy loss during the deformation. Since the new rubber ball has been applied in games from 2018, the material properties and the restitution characteristics of the new rubber ball attract plenty of attention among scholars. In this study, the difference of the material properties and the restitution characteristics between the new and old rubber balls is investigated deeply by the static compression and collision tests. According to the static compression test, we find that the new rubber ball is harder and more difficult to generate deformation than the old one. In the collision test, the rebound ball speeds of both of the new and the old balls become faster when using a smaller diameter of steel cylinder instead of baseball bat, and the rebound ball speed of the new ball is slower than that of the old one under the same experimental conditions. Furthermore, to develop high performance baseball bats adapting to the new rubber baseball, the diameter of the baseball bat is studied by the impact simulation based on the finite element analysis. In the simulation, the batted ball speed under the analytical conditions of different offset heights and different barrel diameters of the bat are evaluated considering the initial spin. As a result, the batted ball speed generated by the bat with diameter φ55 mm is faster than generated by the bat with diameter φ70 mm when the offset height range is smaller than 14.6 mm, so that the bat diameter φ55 mm is recommended according to the present work.

言及状況

外部データベース (DOI)

Twitter (2 users, 2 posts, 8 favorites)

中空のバットより中身が詰まったバットの方が反発係数が高くなるなんてこともありそう。 とりあえず、太いバットより細いバットの方が打球速度が上がるみたい。 新・旧軟式野球ボールの反発特性と新球に適応した金属製バットに関する研究 https://t.co/zq0VWuNaRB https://t.co/YCqZLur1hG
酒井忍ほか「新・旧軟式野球ボールの反発特性と新球に適応した金属製バットに関する研究」2019 年  軟式球は、ゴム製の中空構造であるため、バットで打撃した際の変形が大きい。新軟式球M 号は従来のA 号と比べ直径はA号とほぼ同じで重さが2.0 g 増加 →硬球より目に刺さる https://t.co/9Het7MYVzo

収集済み URL リスト