Digital Human Research Center, National Institute of Advanced Industrial Science and Technology, 2-41-6 Aomi, Koto-ku, Tokyo 135-0064, Japan.
J Biomech. 2009 Dec 11;42(16):2712-20. doi: 10.1016/j.jbiomech.2009.08.025. Epub 2009 Sep 25.
This study examined the factors affecting the ball velocity and rotation for side-foot soccer kick using a numerical investigation. Five experienced male university soccer players performed side-foot kicks with various attack angles and impact points using a one-step approach. The kicking motions were captured three-dimensionally by two high-speed cameras at 2500 fps. The theoretical equations of the ball velocity and rotation were derived based on impact dynamic theory. Using the theoretical equations, the relationships of the ball velocity and rotation to the attack angle and impact point were obtained. The validity of the theoretical equations was verified by comparing the theoretical relationships with measurement values. Furthermore, simulations of the ball velocity and rotation were conducted using the theoretical equations. The theoretical relationships were in good agreement with the measurement values. The theoretical results confirmed the previously reported experimental results, and indicated that the impact point is more influential on the ball velocity than the attack angle and the attack angle is more influential on the ball rotation than the impact point. The simulation results indicated the following. The ball velocity produced by impact for all impact patterns is largely affected by the foot velocity immediately before impact but barely affected by the degree of slip between the foot and the ball. The ball rotation produced by an impact with a large attack angle is affected by the foot velocity immediately before impact and the degree of slip between the foot and the ball; however, these factors affect the ball rotation less than the attack angle.
本研究使用数值研究考察了影响侧足足球踢的球速和旋转的因素。五名经验丰富的男性大学生足球运动员使用一步法以各种攻角和触球点进行侧足踢。踢腿动作通过两台高速摄像机以 2500 fps 的速度进行三维捕捉。根据冲击动力学理论，推导出球速和旋转的理论方程。利用理论方程，得出了球速和旋转与攻角和触球点的关系。通过将理论关系与测量值进行比较，验证了理论方程的有效性。此外，还使用理论方程对球速和旋转进行了模拟。理论关系与测量值吻合良好。理论结果证实了先前报道的实验结果，并表明触球点对球速的影响大于攻角，而攻角对球旋转的影响大于触球点。模拟结果表明：对于所有冲击模式，冲击产生的球速主要受冲击前瞬间脚速的影响，但受脚和球之间滑动程度的影响较小。大攻角冲击产生的球旋转受冲击前瞬间脚速和脚与球之间滑动程度的影响；然而，这些因素对球旋转的影响小于攻角。
