A Study of Knuckling Effect of Soccer Ball (P106)

  • Takeshi Asai
  • Kazuya Seo
  • Yousuke Sakurai
  • Shinichiro Ito
  • Sekiya Koike
  • Masahide Murakami

Abstract

The aerodynamic properties and boundary-layer dynamics of a non-spinning or slowly-spinning soccer ball are not well understood. The purpose of this study is to discuss the magnitude and the frequency of the side force of non-spinning or slowly-spinning flight soccer ball, which called “knuckling effect ball”, using a high speed VTR image of a real place kick. The direct liner transformation method was used to obtain three dimensional coordinates of ball position. The magnitude and the frequency of the side force were measured by a digitizing software system in PC. The magnitude of the side force in real flight was measured to range from about 1 N to 8 N. Additionally, the frequency of the side force in real flight was estimated to range from 1.0 Hz to 3 Hz.

Keywords

field testing video analysis aerodynamic force knuckle 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

5-References

  1. [AT1]
    Asai, T., Akatsuka, T. & Haake, S.J. (1998) The physics of football, Physics World, vol.11–6, 25–27.Google Scholar
  2. [AT2]
    Asai, T., Carré, M.J., Akatsuka, T. & Haake, S.J. (2002) The curve kick of a football, I: impact with the ball. Sports Engineering, 5, 183–192.CrossRefGoogle Scholar
  3. [AT3]
    Asai, T., Seo, K., Kobayashi, O. and Sakashita, R. (2006) Flow visualization on a real flight non-spinning and spinning soccer all. IN: The Engineering of Sport 6, Vol. 1, (eds. E.F. Moritz & S. J. Haake), pp. 327–332. International Sports Engineering Association, Sheffield.Google Scholar
  4. [AT4]
    Asai, T., Seo, K., Kobayashi, O. and Sakashita, R. (2007) Fundamental aerodynamics of the soccer ball, Sports Engineering, ISEA, 10(2), 101–109.Google Scholar
  5. [BS1]
    Barber, S., Haake, S.J. and Carré, M.J. (2006) Using CFD to understand the effects of seam geometry on soccer ball aerodynamics. In: The Engineering of Sport 6, Vol. 2, pp. 127–132. The International Sports Engineering Association.CrossRefGoogle Scholar
  6. [CM1]
    Carré, M.J., Goodwill, S.R., Haake, S.J., Hanna, R.K. and Wilms, J. (2004) Understanding the aerodynamics of a spinning soccer ball. The Engineering of Sport 5 (Eds. M. Hubbard, R.D. Mehta and J.M. Pallis). Pub. The International Sports Engineering Association, Sheffield, UK, 70–76.Google Scholar
  7. [CM2]
    Carré, M.J., Goodwill, S.R. & Haake, S.J. (2005) Understanding the effect of seams on the aerodynamics of an association football. Proc. IMechE Vol. 219 Part C: J. Mechanical Engineering Science, 657–666.Google Scholar
  8. [M1]
    Mehta, R.D. (1985) Aerodynamics of Sports Balls, Annual Review of Fluid Mechanics, 17, 151–189.CrossRefGoogle Scholar
  9. [AA1]
    Abdel-Azis, Y. I. and Karara, H. M. (1971) Direct liner transformation from comparator coodinates into object apace coordinates in close-range photogrammetry. In: Proceedings of the ASP/UI Symposium on Close-Range Photogrammetry. Falls Church. VA: American Society of Photogrammetry, 1–18.Google Scholar

Copyright information

© Springer-Verlag France, Paris 2008

Authors and Affiliations

  • Takeshi Asai
    • 1
  • Kazuya Seo
    • 2
  • Yousuke Sakurai
    • 3
  • Shinichiro Ito
    • 4
  • Sekiya Koike
    • 1
  • Masahide Murakami
    • 3
  1. 1.Inst. of Health and Sports ScienceTsukuba Univ.TsukubaJapan
  2. 2.Faculty of Education, Art and ScienceYamagata Univ.YamagataJapan
  3. 3.Graduate School of Systems and Information, n EngineeringUniv. of TsukubaTsukubaJapan
  4. 4.Department of Mechanical EngineeringNational Defence, AcademyYokosukaJapan

Personalised recommendations