Profiling of a Pitcher’s Performance with a Smart Baseball: A Case Report

Proceedings

Young-Kwan Kim¹  Franz Konstantin Fuss²  Kwangyul Jeong²  Batdelger Doljin² 

[1] Department of Physical Education, Chonnam National University, Gwangju 500-757, Korea;Smart Products Engineering program, Centre for Design Innovation, Swinburne University of Technology, Melbourne, VIC 3122, Australia;

关键词: baseball;    smart baseball ball;    profiling;    performance;    skill;    spin rate;   

DOI  :  10.3390/proceedings2020049103

来源: DOAJ

【 摘 要 】

A pitcher’s action, when delivering a fastball, was analyzed from the data provided by a smart baseball. The spin rate at the release of the ball was merely 15.7 rps, however, the peak torque was excessively high, namely 0.396 Nm. The reason why the pitcher was not able to translate the torque entirely to angular kinetic energy and this to the spin rate was that the spin axis changed its direction suddenly three times when moving across the ball’s surface. This resulted in angles between torque and angular velocity vectors of greater than 90°, high precession and precession torque, and negative spin torques, causing a very low efficiency (5.4%) and a slow spin rate at the release of the ball.

【 授权许可】

Unknown