A Sports Engineering Study on Mechanism in Curve-Kick

曲线踢运动机理的运动工程学研究

• 批准号: 15500424
• 负责人: ASAI Takeshi
• 金额: $ 1.92万
• 依托单位: Yamagata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15500424/
• 关键词: cuve kick; soccer; FEM; fluid; wind tunnel; drag; カーブ; インパクト; ボール

The purpose of this study was to analyze the fundamental characteristics that cause a football to spin in an infront curve kick. Experimental studies of football players showed that the average foot velocity was 24.2 m/s and the average ball velocity was 27.1 m/s. The average spin rate was 7.8 revolutions per second. The attacking angle between the face vector and the swing vector at impact was also observed in each trial and the average attacking angle was found to be 35.4 degrees. Finite element models of the infront curve kick showed that the spin rate of the ball increases as attacking angle is increased. However, the spin rate falls rapidly in the case of the attacking angle being 75 degrees or greater. The ball velocity decreases as the attacking angle is increased. It is considered that, for the infront curve kick, a foot orientation at impact, with the attacking angle between the face vector and the swing vector, generates the optimum moment with which to generate ball spin.In the wind tunnel test, it is found that the biggest aerodynamic difference between the soccer ball and the smooth sphere is the Reynolds number dependency of the drag coefficient. In the case of the smooth sphere, the drag coefficient is almost 0.43 for Re<3.1×10^5, and 0.11 for Re>3.5×10^5. The critical Reynolds number is about 3.1×10^5. These values are comparable with the conventional data. On the other hand, the drag coefficient of the soccer ball is independent of the Reynolds number. The drag coefficient is constant around 0.2.

本研究的目的是分析导致足球在前曲线踢中旋转的基本特征。对足球运动员的实验研究表明，平均脚速度为24.2 m/s，平均球速度为27.1 m/s。平均旋转速度为每秒 7.8 转。在每次试验中还观察了击球时杆面矢量和挥杆矢量之间的攻角，发现平均攻角为 35.4 度。前曲线踢的有限元模型表明，球的旋转速率随着攻击角度的增加而增加。然而，在攻角为75度以上的情况下，旋转速度急剧下降。球速随着攻击角度的增加而降低。认为，对于前曲线踢球，击球时脚的方向以及球面矢量和挥杆矢量之间的攻角，产生了产生球旋转的最佳力矩。在风洞试验中，发现足球和光滑球体之间最大的空气动力学差异是阻力系数的雷诺数依赖性。在光滑球体的情况下，对于Re<3.1×10^5，阻力系数几乎为0.43，对于Re>3.5×10^5，阻力系数为0.11。临界雷诺数约为3.1×10^5。这些值与传统数据相当。另一方面，足球的阻力系数与雷诺数无关。阻力系数恒定在0.2左右。

项目成果

金達郎, 浅井武, 他: "飛翔中における野球ボールの回転数の変化"日本機械学会スポーツ工学シンポジウム講演論文集. 2003. 14-18 (2003)

Kintaro、Takeshi Asai 等人：“棒球在飞行过程中旋转速度的变化”日本机械工程学会运动工程学研讨会论文集 2003 年。14-18 (2003)。

Development of a lower extremity skeletal model using the finite element method

使用有限元法开发下肢骨骼模型

• 发表时间: 2003
• 期刊: Sports Dynamics -Discovery and Application-(A.Subic, P.Trivailo and F.Alarm Ed.)
• 作者: T.Asai;S.Takano;H.Murakami;K.Ikeda
• 通讯作者: K.Ikeda

瀬尾和哉, 浅井武, 他2名: "回転及び無回転のサッカーボールに働く空気力"日本機械学会スポーツ工学シンポジウム講演論文集. 2003. 9-13 (2003)

Kazuya Seo、Takeshi Asai 等 2 人：“作用于旋转和非旋转足球的空气动力”日本机械工程师学会运动工程学研讨会论文集 2003 年。 9-13 (2003)。

Oblique impact analysis using the finite element lower extremity model

使用有限元下肢模型进行倾斜冲击分析

• 发表时间: 2003
• 期刊: Proc.of 6th Symposium on footwear biomechanics, ISB
• 作者: T.Asai;H.Murakami;Y.Kaneko
• 通讯作者: Y.Kaneko

浅井武: "スポーツにおける高速ビデオカメラ(特集解説論文)"可視化情報. 23(89). 27-32 (2003)

Takeshi Asai：“体育中的高速摄像机（特别评论论文）”可视化信息23（89）。