Ishii Hideyuki, Sakurai Yoshihisa, Maruyama Takeo
Department of Sport and Wellness, Rikkyo University, 1-2-26 Kitano, Niiza-shi, Saitama 352-8558, Japan.
Department of Sports Sciences, Japan Institute of Sports Sciences, 3-15-1 Nishigaoka, Kita-ku, Tokyo 115-0056, Japan.
Sci Rep. 2014 Aug 14;4:6067. doi: 10.1038/srep06067.
New soccer shoes have been developed by considering various concepts related to kicking, such as curving a soccer ball. However, the effects of shoes on ball behaviour remain unclear. In this study, by using a finite element simulation, we investigated the factors that affect ball behaviour immediately after impact in a curve kick. Five experienced male university soccer players performed one curve kick. We developed a finite element model of the foot and ball and evaluated the validity of the model by comparing the finite element results for the ball behaviour immediately after impact with the experimental results. The launch angle, ball velocity, and ball rotation in the finite element analysis were all in general agreement with the experimental results. Using the validated finite element model, we simulated the ball behaviour. The simulation results indicated that the larger the foot velocity immediately before impact, the larger the ball velocity and ball rotation. Furthermore, the Young's modulus of the shoe upper and the coefficient of friction between the shoe upper and the ball had little effect on the launch angle, ball velocity, and ball rotation. The results of this study suggest that the shoe upper does not significantly influence ball behaviour.
新型足球鞋是通过考虑与踢球相关的各种概念而研发出来的，比如使足球变向。然而，鞋子对球的运动表现的影响仍不明确。在本研究中，我们通过有限元模拟，研究了在弧线球踢球过程中影响球在撞击后即刻运动表现的因素。五名经验丰富的男性大学足球运动员进行了一次弧线球踢球。我们建立了脚和球的有限元模型，并通过将撞击后即刻球的运动表现的有限元结果与实验结果进行比较，评估了该模型的有效性。有限元分析中的出射角度、球速和球的旋转与实验结果总体一致。使用经过验证的有限元模型，我们模拟了球的运动表现。模拟结果表明，撞击前瞬间脚的速度越大，球速和球的旋转就越大。此外，鞋帮的杨氏模量以及鞋帮与球之间的摩擦系数对出射角度、球速和球的旋转影响很小。本研究结果表明，鞋帮对球的运动表现没有显著影响。
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