CiNii Articles - Knuckleball

1

Flow structure of knuckling effect in footballs

Asai Takeshi , Kamemoto Kyoji , 淺井武

… In this study, we analyse the characteristics of the vortex structure of a soccer ball subject to the knuckling effect (knuckleball), using high-speed video images and smoke-generating agents. …

Journal of fluids and structures 27(5-6), 727-733, 2011-00-00

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2

Unsteady aerodynamic force on a knuckle ball in soccer [in Japanese]

洪性賛 , 浅井武

体育学研究 55(2), 553-563, 2010-12-00
3

A38 Aerodynamic Characteristics of Knuckling Effect Ball in Soccer [in Japanese]

HONG Sungchan , SAKAMOTO Keiko , SEO Kazuya , ITO Shinichiro , ASAI Takeshi

… The purpose of this study was to discuss the fluid mechanics acting on a non-spinning and low-spinning flight soccer ball, which called "Knuckling effect ball" or "Knuckleball", using the kick-robot. … Furthermore, the knuckleball was observed to have an average lift force frequency of approximately 2.0 Hz. …

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics 2010, 167-172, 2010-11-02

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4

A-17 A fundamental study on Knuckling Effect of non-spinning soccer ball [in Japanese]

HONG Sungchan , SUDA Syogo , NAKAYAMA Masao , ASAI Takeshi

… The purpose of this study was to discuss the fluid mechanics and frequency of forces acting on a non-spinning and low-spinning flight soccer ball, which called "Knuckleball", using high-speed VTR image of a real place kick. … Moreover, the fluid around the knuckleball in flight was visualized using a smoke agent (titanium tetrachloride), and an attempt was made to clarify the fundamental fluid mechanics expressed by the knuckleball as well as to analyze the vortex dynamics. …

ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics 2009, 88-93, 2009-12-02

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5

3D-Trajectory Analysis of Side-Spin Knuckle Ball and Quasi-Steady Side-Force in Flight(<Special Issue> "Progess of Fluid Science on Sports Engineering") [in Japanese]

MIZOTA Taketo , KAWAMURA Yoshiyuki

… As a result, quasi-steady assumption, which was based on knuckleball flutter theory, was verified. …

Transactions of the Japan Society of Mechanical Engineers. B 73(734), 1981-1986, 2007-10-25

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6

Numerical study of the movement of the knuckleball with rifle spin

Denbo Kanako , Kawamura Tetuya

… In this study, the flow around the knuckleball with rifle spin is numerically simulated by solving the incompressible Navier-Stokes equations and computed the aerodynamics coefficients (i.e. drag, lift and side force coefficients) of the ball by using the results of flow calculations. … From the computations, we obtain numerically the "irregular change of the orbit" which is the most remarkable feature of the knuckleball. …

Natural science report of the Ochanomizu University 56(2), 47-55, 2006-01-00

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7

1609 Aerodynamic characteristics and 3D-trajectory of new knuckleball [in Japanese]

Mizota Taketo , Nishikiori Daisuke

Fluids engineering conference ... 2005, 241, 2005-10-28

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8

AM05-05-001 Aerodynamics and 3D trajectory analysis of new-type Knuckleball [in Japanese]

MIZOTA Taketo , NISHIKIORI Daisuke

… A new type knuckleball aerodynamics is studied. … This knuckleball is thrown having a rotation axe toward the ball proceeding direction. … We call this changing ball as a spiral knuckleball, because of its changing direction is spiral feature. … This changing ball is available for faster rotation speed than that of side spin knuckleball. …

Proceedings, ... meeting of Japan Society of Fluid Mechanics 2005, 91, 2005-09-05

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9

Flutter mechanism of knuckleball trajectory under fluid torque [in Japanese]

Mizota Taketo , Kawamura Yoshiyuki , OKAJIMA Atsushi

Fluids engineering conference ... 2000, 82, 2000-09-08

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10

Study on Boundary-Layer Transition, Separation and Three-Dimensional Wake Structures post Knuckleball [in Japanese]

Kiura Toshiro , Higuchi Hiroshi , Kohama Yasuaki

… The irregular dynamic behavior of a knuckleball is believed to be caused by the seam and the asymmetrical flow separation. …

年次大会講演論文集 : JSME annual meeting 2000(4), 147-148, 2000-07-31

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11

101 Boundary-Layer Separation and Fluctuation of Wake on the Knuckleball [in Japanese]

Kiura Toshiro , Higuchi Hiroshi , Kohama Yasuaki

The dynamic behavior of a sports ball has a close relationship with fluid dynamics. The seams and/or dimples on the ball surface affect the lift and side forces as well as the drag as it flies through …

講演論文集 2000(35), 4-5, 2000-03-11

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12

Erratic Trajectory Analysis of Video Image for Knuckleball Shot by Machine [in Japanese]

MIZOTA Taketo , KAWAMURA Yoshiyuki , KUBA Hiroyuki , OKAJIMA Atsushi

JWE : 日本風工学研究会誌 79, 163-164, 1999-04-30
13

Erratic Behaviour of Knuckleball : (2) Wake Field and Aerodynamic Forces [in Japanese]

MIZOTA Taketo , KUBA Hiroyuki , OKAJIMA Atsushi

JWE : 日本風工学研究会誌 : Journal of Wind Engineering (62), 15-21, 1995-01-31

References (2) Cited by (5)
14

Erratic Behaviour of Knuckleball : (1) Quasi-Steady Flutter Analysis and Experiment [in Japanese]

MIZOTA Taketo , KUBA Hiroyuki , OKAJIMA Atsushi

JWE : 日本風工学研究会誌 : Journal of Wind Engineering (62), 3-13, 1995-01-31

References (9) Cited by (9)
15

An Aerodynamic Analysis of a Knuckleball [in Japanese]

Ikushima Yasuo , Torisaki Atsushi , Ohji Michio

Bulletin of the University of Electro-Communications 3(1), 65-70, 1990-06-00

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