Barber, S. and Carré, M.J. (2010) The effect of surface geometry on soccer ball trajectories. Sports Engineering, 13 (1). pp. 47-55. ISSN 1369-7072
Two different measurement techniques are used to examine the effect of surface geometry on soccer ball trajectories. Five professional players are observed using high-speed video when taking curling free kicks with four different soccer balls. The input conditions are measured and the average launch velocity and spin are found to be approximately 24 m/s and 106 rad/s. It is found that the players can apply more spin (~50%) on average to one ball, which has a slightly rougher surface than the other balls. The trajectories for the same four balls fired at various velocities and spin rates across a sports hall using a bespoke firing device are captured using high-speed video cameras, and their drag and lift coefficients estimated. Balls with more panels are found to experience a higher lift coefficient. The drag coefficient results show a large amount of scatter, and it is difficult to distinguish between the balls. Using the results in a trajectory prediction programme it is found that increasing the number of panels from 14 to 32 can significantly alter the final position of a 20 m-curling free kick by up to 1 m.
|Copyright, Publisher and Additional Information:||© 2010 International Sports Engineering Association. This is an author produced version of a paper subsequently published in Sports Engineering. Uploaded in accordance with the publisher's self-archiving policy.|
|Institution:||The University of Sheffield|
|Academic Units:||The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)|
|Depositing User:||Symplectic Sheffield|
|Date Deposited:||26 Apr 2016 11:37|
|Last Modified:||26 Apr 2016 12:03|