Abstract:
:Although the lift force (F(L)) on a spinning baseball has been analyzed in previous studies, no study has analyzed such forces over a wide variety of spins. The purpose of this study was to describe the relationship between F(L) and spin for different types of pitches thrown by collegiate pitchers. Four high-speed video cameras were used to record flight trajectory and spin for 7 types of pitches. A total of 75 pitches were analyzed. The linear kinematics of the ball was determined at 0.008-s intervals during the flight, and the resultant fluid force acting on the ball was calculated with an inverse dynamics approach. The initial angular velocity of the ball was determined using a custom-made apparatus. Equations were derived to estimate the F(L) using the effective spin parameter (ESp), which is a spin parameter calculated using a component of angular velocity of the ball with the exception of the gyro-component. The results indicate that F(L) could be accurately explained from ESp and also that seam orientation (4-seam or 2-seam) did not produce a uniform effect on estimating F(L) from ESp.
journal_name
J Appl Biomechjournal_title
Journal of applied biomechanicsauthors
Nagami T,Higuchi T,Nakata H,Yanai T,Kanosue Kdoi
10.1123/jab.2015-0068subject
Has Abstractpub_date
2016-04-01 00:00:00pages
196-204issue
2eissn
1065-8483issn
1543-2688pii
2015-0068journal_volume
32pub_type
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