A Relation between Compression Number and Coefficient of Restitution of Golf Balls

Yokoyama, Takashi; Yamada, Yasuhiro

doi:10.1299/jsmesports.2000.0_170

Cited by 3 publications

(7 citation statements)

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“…As the figure illustrates, F increased in the early stages of the impact and then decreased in the later stages. Similar results have also been reported in measurements of the impact load [6,8,[11][12][13][14].…”

Section: Contact Force During Impactsupporting

confidence: 89%

“…However, the validity and applicability of these analytical methods require experimental verification and determination of the material properties used in the analyses. Experimental studies have also been made on the dynamic contact force, contact time, coefficient of restitution [8][9][10][11][12][13][14][15]. The contact force on a normal impact reportedly increases significantly with the impact ball velocity, while the contact time and coefficient of restitution decrease gradually.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Deformation Behavior of a Golf Ball during Normal Impact

et al. 2008

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The normal impact between a golf ball and a rigid steel target was studied to examine ball deformation and the contact force during the impact. Using high-speed video images, the normal and tangential compression ratios of the ball were measured to analyze the ball deformation quantitatively. In addition, the inbound and rebound ball velocities, contact time, and coefficient of restitution were determined as basic parameters of the impact. As the inbound ball velocity increased, the maximum normal compression ratio increased while the maximum tangential compression ratio, contact time and coefficient of restitution decreased. The ball center displacements during the impact were measured to determine the ball center velocity and acceleration, and the contact force was calculated by the product of the mass and acceleration. The contact force increased almost linearly with the inbound ball velocity, and its relationship agreed well quantitatively with the results from a load-cell, and also agreed well qualitatively with Hertz contact theory.

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Section: Contact Force During Impactsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Dynamic Deformation Behavior of a Golf Ball during Normal Impact

et al. 2008

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“…The λ-t curve was not symmetric: a slight convex slope in the compression phase and a concave slope in the restitution phase were observed. Similar results have also been reported in measurements of impact load [1,7] and compression ratio [16] due to the viscoelastic deformation of the ball during impact. In contrast, ζ remained almost constant with t at 46%.…”

Section: Contact Areasupporting

confidence: 88%

“…Many researchers have studied the impact behavior of a golf ball to determine the dynamic contact force and time, the coefficient of restitution, and spin rate of the ball as a function of the impact velocity [1][2][3][4][5][6][7][8][9][10]. The contact force and spin rate increase significantly with velocity while the contact time and coefficient of restitution gradually decrease.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Contact Behavior of a Golf Ball during Oblique Impact: Effect of Friction between the Ball and Target

et al. 2007

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The oblique impact between a golf ball and a polymethyl methacrylate (PMMA) target with smooth transparent surfaces was studied using a high-speed video camera. Video images of the impact were recorded from the backside of the target and were used to determine the contact time, contact area, and the displacement and rotation of the ball along the target. The average tangential and angular velocities were determined as functions of the inbound ball velocity. As the inbound ball velocity increased, the contact area and average tangential and angular velocities also increased while the contact time decreased. An oiled PMMA target was used to study the effect of reduced friction between the ball and target. The results were compared with earlier data for a steel target with relatively rough surfaces. The contact area and time were unaffected by friction, but the average tangential velocity increased while the average angular velocity decreased as the friction decreased.

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“…The dynamic behavior of a golf ball during normal and oblique impacts has been investigated from theoretical, numerical, and experimental viewpoints [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In theoretical analyses, for example, oblique impacts have been studied by assuming a rigid body model, i.e., impacts between a rigid sphere and a rigid surface, and then the angular and tangential velocities along the surface were calculated [1,2].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Contact Behavior of a Golf Ball during an Oblique Impact

et al. 2006

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The oblique impact between a golf ball and a rigid steel target was studied using a high-speed video camera. Video images recorded before and after the impact were used to determine the inbound velocity v i , rebound velocity v r , inbound angle q i , rebound angle q r , and the coefficient of restitution e. The results showed that q r and e decreased as v i increased. The maximum compression ratio ) c , contact time t c , average angular velocity 5, and tangential velocity v t , along the target were determined from images obtained during the impact. The images demonstrated that ) c increased with v i while t c decreased. In addition, 5 and v t increased almost linearly as v i increased. A rigid body model was used to estimate the final angular velocity 5* and tangential velocity 3 t * at the end of the impact; these results were then compared with experimental data.

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A Relation between Compression Number and Coefficient of Restitution of Golf Balls

Cited by 3 publications

References 0 publications

Dynamic Deformation Behavior of a Golf Ball during Normal Impact

Dynamic Deformation Behavior of a Golf Ball during Normal Impact

Dynamic Contact Behavior of a Golf Ball during Oblique Impact: Effect of Friction between the Ball and Target

Dynamic Contact Behavior of a Golf Ball during an Oblique Impact

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