Unsteady Aerodynamic Force on a Knuckleball in Soccer

被引：18

作者：

Hong, Sungchan ^{[1
]}

Chung, Chulsoo ^{[2
]}

Nakayama, Masao ^{[3
]}

Asai, Takeshi ^{[3
]}

机构：

[1] Univ Tsukuba, Doctoral Program Comprehens Human Sci, Tennoudai 1-1-1, Ibaraki 3058574, Japan

[2] Seoul Natl Univ, Seoul 151742, South Korea

[3] Univ Tsukuba, Ibaraki 3058574, Japan

来源：

ENGINEERING OF SPORT 8: ENGINEERING EMOTION - 8TH CONFERENCE OF THE INTERNATIONAL SPORTS ENGINEERING ASSOCIATION (ISEA) | 2010年 / 2卷 / 02期

关键词：

Ball; Knuckleball; Aerodynamics; Unsteady; Vortex; SPHERE; FLOW;

D O I：

10.1016/j.proeng.2010.04.015

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The purpose of this study is to analyze the fluid mechanics and frequency of forces acting on a knuckleball, specifically a soccer ball that was kicked and was in flight, was visualized using a smoke agent (titanium tetrachloride), and its unsteady aerodynamics were investigated. In the case of the knuckleball, the peak value of the vortex lift reached approximately 2.0 N, and the average vortex lift force frequency of approximately 3.5 Hz. A comparison of this vortex lift frequency and vortex oscillation frequency indicated that these frequencies tended to act in unison with a high statistical correlation (r = 0.83, p < 0.01). (C) 2010 Published by Elsevier Ltd.

引用

收藏

页码：2455 / 2460

页数：6

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