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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

Research Project

Project/Area Number 26282177
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypePartial Multi-year Fund
Section一般
Research Field Sports science
Research InstitutionWaseda University

Principal Investigator

Yanai Toshimasa  早稲田大学, スポーツ科学学術院, 教授 (50387619)

Research Collaborator Kidokoro Shuji  
Miyazawa Takashi  
Shimura Mei  
Project Period (FY) 2014-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
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)
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
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.

Report

(5 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Annual Research Report
  • 2015 Annual Research Report
  • 2014 Annual Research Report

Research Products

(6 results)

All 2018 2016 2015

All Journal Article (5 results) (of which Acknowledgement Compliant: 4 results,  Peer Reviewed: 1 results) Presentation (1 results)

  • [Journal Article] Optimal bat orientation and ball-impact point for maximization of batted ball velocity in opposite field hitting:2018

    • Author(s)
      志村 芽衣、宮澤 隆、矢内 利政
    • Journal Title

      Japan J. Phys. Educ. Hlth. Sport Sci.

      Volume: 00 Issue: 1 Pages: 00-00

    • DOI

      10.5432/jjpehss.17049

    • NAID

      130007397906

    • ISSN
      0484-6710, 1881-7718
    • Related Report
      2017 Annual Research Report
  • [Journal Article] 野球の『流し打ち』における飛距離を最大にする最適なインパクト2016

    • Author(s)
      志村芽衣、宮澤隆、矢内利政
    • Journal Title

      スポーツ・アンド・ヒューマンダイナミクス2017講演論文集

      Volume: C-1 Pages: 1-10

    • NAID

      130007166522

    • Related Report
      2016 Annual Research Report
    • Acknowledgement Compliant
  • [Journal Article] 野球の打球速度を最大化するインパクト位置はスイング速度とバットの回転中心位置によって変化する2016

    • Author(s)
      宮澤隆、志村芽衣、矢内利政
    • Journal Title

      スポーツ・アンド・ヒューマンダイナミクス2017講演論文集

      Volume: C-4 Pages: 1-9

    • Related Report
      2016 Annual Research Report
    • Acknowledgement Compliant
  • [Journal Article] 野球のバントにおける打球速度を最小化させるインパクト特性2015

    • Author(s)
      城所収二、安藤義人、伊藤和、矢内利政
    • Journal Title

      バイオメカニクス研究

      Volume: 19 Pages: 126-136

    • NAID

      40020707983

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] 野球のバットの芯はスイング速度に応じて変化する2015

    • Author(s)
      宮澤隆、志村芽衣、矢内利政
    • Journal Title

      シンポジウム:スポーツ工学・ニューマンダイナミクス2015 講演論文集

      Volume: No.15-21

    • Related Report
      2015 Annual Research Report
    • Acknowledgement Compliant
  • [Presentation] 野球のバットの芯はスイング速度に応じて変化する2015

    • Author(s)
      宮澤隆
    • Organizer
      シンポジウム:スポーツ工学・ニューマンダイナミクス2015
    • Place of Presentation
      立命館大学
    • Year and Date
      2015-10-30
    • Related Report
      2015 Annual Research Report

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Published: 2014-04-04   Modified: 2019-03-29  

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