Relation Between Lift Force and Ball Spin for Different Baseball Pitches
Relation Between Lift Force and Ball Spin for Different Baseball Pitches
复制标题
DOI：
10.1123/jab.2015-0068
复制
发表时间：
2016-04-01
影响因子：
1.4
通讯作者：
Kanosue, Kazuyuki
中科院分区：
文献类型：
--
作者：
Nagami, Tomoyuki;Higuchi, Takatoshi;Kanosue, Kazuyuki
虽然在以前的研究中已经分析了旋转棒球上的升力（F-L），但没有研究分析过各种旋转的升力。摘要本研究旨在探讨大专投手不同类型投球的旋转与球长的关系。采用四台高速摄像机记录了7种不同投球方式的飞行轨迹和尾旋。总共分析了75个音高。球的线性运动学在飞行过程中以0.008-s的间隔确定，并且用逆动力学方法计算作用在球上的合成流体力。球的初始角速度是使用定制的装置确定的。导出了使用有效自旋参数（ESp）来估计F-L的方程，有效自旋参数（ESp）是使用除陀螺分量之外的球的角速度分量计算的自旋参数。结果表明，F-L可以准确地解释从ESP和煤层方向（4-煤层或2-煤层）也没有产生均匀的影响，估计F-L从ESP。
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.