Coefficient of restitution of a baseball bat is not a set quantity, but it is altered as angular and translational swing velocities and the point of impact are changed
| Project/Area Number |
26282177
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Sports science
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| Research Institution | Waseda University |
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Principal Investigator |
Yanai Toshimasa 早稲田大学, スポーツ科学学術院, 教授 (50387619)
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| Research Collaborator |
Kidokoro Shuji
Miyazawa Takashi
Shimura Mei
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000)
Fiscal Year 2016: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2015: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2014: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
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| Keywords | 野球 / 打撃 / インパクト / 振動特性 / バント / 打球速度 / 芯 / 正面衝突 |
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| Outline of Final Research Achievements |
This study revealed that even with the same bat head velocity during a swing, varying combinations of angular swing velocity and translational swing velocity can result in different batted ball velocities, and that a large translational swing velocity results in a greater batted ball velocity than a large angular swing speed. In other words, the point of impact that maximizes batted ball velocity changes based on the combination of angular swing velocity and translational swing velocity. These phenomena occur because (a) the coefficient of restitution of the bat is not a set quantity, but it is altered as angular swing velocity, translational swing velocity and the point of impact are changed and (b) the magnitude and the direction of the linear and angular momenta transferred between the bat and the baseball is altered by varying angular swing velocity, translational swing velocity and the point of impact.
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Report
(5 results)
Research Products
(6 results)
