除了彈之外的其他原因? - 棒球
By Freda
at 2020-05-20T20:04
at 2020-05-20T20:04
Table of Contents
MLB在2016開始全壘打滿天飛
於是球評、觀眾、球員都說球變的很彈
但是MLB官方驗了很多次的彈性係數都沒發現有變彈
後來委託MIT、Stanford、Caltech、USC...等等學校的研究人員
做了長達八十四頁的報告
連結:http://tinyurl.com/yc58eyl6
作者群:https://imgur.com/GMXWkcJ.png
Table1歷年的Home run rate
Figure 42是2002到2017的COR,整理成下表
HR% COR
2014 3.2 0.553
2015a 3.9 0.558
2015b 4.5
2016 4.9 0.557
2017 5.3 0.557
感覺不出球有變彈
所以他們又做了升力係數,周長,重心偏擺,重量,還有最重要的改變
阻力系數的模擬跟實驗
結果如下圖
https://imgur.com/ggBbXMw.png
左邊是真實的飛行距離改變,右邊是各變因貢獻
可以看到結果是球變滑了導致飛的更遠
2017大概跟2014比多了6ft
(以初飛行速度100mph,仰角30度,2500反轉可以飛390ft當基準)
而這6ft的距離可以導致HR%從3.2飆到5.3
然後彈性係數差0.01 (也就是今年的case 0.56->0.57)
差不多也可以多6ft的飛行距離
所以今年的全壘打理論上來說應該會多60%左右
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