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Relation Between Lift Force and Ball Spin for Different Baseball Pitches
Tomoyuki Nagami1, Takatoshi Higuchi, Hiroki Nakata
1Faculty of Sport Sciences, Waseda University, Tokorozawa, Saitama, Japan.
Journal of Applied Biomechanics
|November 18, 2015
Summary
The lift force on a spinning baseball is accurately predicted using the effective spin parameter (ESp), regardless of seam orientation. This finding simplifies understanding baseball aerodynamics.
Area of Science:
- Aerodynamics
- Sports Science
- Biomechanics
Background:
- Previous studies have analyzed lift force (F(L)) on spinning baseballs, but not across a wide range of spin types.
- Understanding the relationship between spin and lift force is crucial for analyzing baseball pitch dynamics.
Purpose of the Study:
- To describe the relationship between lift force (F(L)) and spin for various pitch types thrown by collegiate pitchers.
- To develop and validate a method for estimating lift force based on spin characteristics.
Main Methods:
- Utilized four high-speed video cameras to record the flight trajectory and spin of 75 pitches across 7 types.
- Calculated resultant fluid force using inverse dynamics and determined linear kinematics at 0.008-s intervals.
- Derived equations to estimate F(L) using the effective spin parameter (ESp), excluding the gyro-component of angular velocity.
Main Results:
- Lift force (F(L)) could be accurately explained by the effective spin parameter (ESp).
- Seam orientation (4-seam or 2-seam) did not significantly affect the uniform estimation of F(L) from ESp.
Conclusions:
- The effective spin parameter (ESp) is a reliable predictor of lift force on a spinning baseball.
- Pitch type and seam orientation have a less uniform impact on lift force estimation than previously assumed when using ESp.
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