A Study on Center of Gravity of Driver Head and Grip Center Line at Golf Ball Impact Moment

2014 ◽  
Vol 55 ◽  
pp. 531-538
Author(s):  
Kun Chun Lee ◽  
Ah Ram Suh ◽  
Chang Kook Kim ◽  
Tae Yoon Kim ◽  
Sun Ung Kim
Keyword(s):  
Center Of Gravity ◽  
Golf Ball ◽  
Center Line ◽  
Ball Impact

scholarly journals Ball Impact Position in Recreational Male Padel Players: Implications for Training and Injury Management

2021 ◽  
Vol 18 (2) ◽  
pp. 435
Author(s):  
Bernardino Javier Sánchez-Alcaraz ◽  
Rafael Martínez-Gallego ◽  
Salvador Llana ◽  
Goran Vučković ◽  
Diego Muñoz ◽  
...  
Keyword(s):  
Motion Tracking ◽  
Center Of Gravity ◽  
Musculoskeletal Injuries ◽  
Ball Impact ◽  
Video System ◽  
Injury Management ◽  
Racket Sports ◽  
Impact Position ◽  
Proper Training

Racket sports such as padel are characterized by the repetition of unilateral gestures, which can lead to negative adaptations like asymmetries or overuse musculoskeletal injuries. The purpose of this study was to determine the differences in ball impact positions (i.e., forward or backward of the center of gravity) in nine stroke types in a sample of forty-eight recreational male padel players. The sample included 14,478 shots corresponding to 18 matches from six tournaments. Forty-eight male padel players were classified into two groups according to their level: trained (n = 24) and novice (n = 24). Type of stroke and ball impact position were registered using a computerized motion tracking video system. The ball impact position was computed from the distance (cm) between the coordinates of the ball and the player’s center of gravity. Results show that trained players hit the ball in a more backward position (from 11 to 25 cm, compared to novice) in serve and offensive strokes (volleys, trays, and smashes) but used more forward strokes (from 7 to 32 cm, compared to novice) in defensive shots (groundstrokes, wall strokes, and lobs). Because the current differential variables are trainable and demonstrated to be of relevance for performance, the findings of this study may assist padel coaches in designing proper training plans to improve effectiveness and to prevent musculoskeletal injuries regarding the type of stroke and ball impact position. Such knowledge may constitute a very important factor affecting technique, biomechanics, and injury management in padel players of different competitive levels.

Modeling the sound of a golf club impact

2012 ◽  
Vol 226 (2) ◽  
pp. 107-113 ◽  
Author(s):  
Tom Mase ◽  
Roger Sharpe ◽  
Nickolai Volkoff-Shoemaker ◽  
Scott Moreira
Keyword(s):  
Boundary Element Methods ◽  
Golf Ball ◽  
Head Model ◽  
Golf Club ◽  
Titanium Plate ◽  
Ball Impact ◽  
Association Coefficient ◽  
Tap Test ◽  
Sound Simulation ◽  
The Impact

A driver–golf ball impact was modeled and sound predicted using finite elements and boundary element methods. The driver head model had some features (artwork and scallops) removed to simplify the model. This de-featuring resulted in some of the simulated modes to be slightly lower than the ‘tap test’ measured modes of the fully featured, production driver. Computed acoustic modes in areas of the club head not de-featured matched experimental modes. Additionally, the impact sound simulation of a golf ball with a United States Golf Association coefficient of restitution titanium plate, with no features omitted, was completed. Acoustic pressure modes predicted well the modes measured by an accelerometer as the plate was excited by a modal hammer.

High Speed Golf Ball Impact on a Substrate

2013 ◽  
Vol 440 ◽  
pp. 314-319 ◽  
Author(s):  
D. Pincott ◽  
A.S. Blicblau
Keyword(s):  
High Speed ◽  
Metal Plate ◽  
Golf Ball ◽  
Golf Club ◽  
Ball Impact ◽  
Coated Metal ◽  
Extra Energy ◽  
Golf Clubs ◽  
The Impact ◽  
Interest And Motivation

This project aims to investigate the effect impacting a high speed golf ball on TiN coated metal plate, a simulated golf club head. It was found that the surface coating caused greater deformation of the golf ball. It can be said that a club with this coating will absorb less energy from the impact. The result of this is that the energy will that was not absorbed by the club threw deformation will remain in the golf ball. This extra energy will be transformed into two forms of kinetic energy. The other will be used up by the forces acting on the ball during flight. This research is important as large golf club and golf ball companies have great interest and motivation to further their understanding of new ways to improve their golf clubs.

scholarly journals Desain dan fabrikasi patok rintangan lapangan golf bahan polymeric foam yang diperkuat serat tandan kosong kelapa sawit

2018 ◽  
Vol 16 (1) ◽  
pp. 14
Author(s):  
Zulfahmi Zulfahmi
Keyword(s):  
Contact Point ◽  
Golf Ball ◽  
Golf Course ◽  
Fiber Reinforced ◽  
Ball Speed ◽  
Ball Impact ◽  
Polymeric Foam ◽  
Tension Distribution ◽  
Fiber Tension ◽  
Ansys Workbench

A golf course with obstacles in the forms of water obstacle and lateral water obstacle marked with the stakes which are called golf course obstacle stake in this study. This study focused on the design and fabrication of the golf course obstacle stake with a solid cylindrical geometry using EFB fiber-reinforced polymeric foam composite materials. To obtain the EFB fiber which is free from fat content and other elements, EFB  is soaked in the water with 1% (of the watre total volume) NaOH. The model of the mould designed is permanent mould that can be used for the further refabrication process. The mould was designed based on resin-compound paste materials with talc powder plus E-glass fiber to make the mould strong. The composition of polimeric foam materials comprised unsaturated resin Bqtn-Ex 157 (70%), blowing agent (10%), fiber (10%), and catalyst (10%).  The process of casting the polimeric foam composit materials into the mould cavity should be at vertical casting position, accurate interval time of material stirring, and periodical casting. To find out the strength value of the golf course obstacle stake product, a model was made and simulated by using the software of Ansys workbench 14.0, an impact loading was given at the height of 400 mm and 460 mm with the variation of golf ball speed (USGA standard) v = 18 m/s, v =35 m/s, v = 66.2 m/s, v = 70 m/s, and v = 78.2 m/s. The clarification showed that the biggest dynamic explicit loading impact of Fmax = 142.5 N at the height of 460 mm with the maximum golf ball speed of 78.2 m/s did not experience the hysteresis effect and inertia effect. The   largest deformation area occured at the golf ball speed v = 66.2 mm/s, that is 18.029 mm (time: 2.5514e-004) was only concentrated around the sectional area of contact point of impact, meaning that the golf course obstacle stakes made of EFB fiber-reinforced polymeric foam materials have the geometric functional strength that are able to absorb the energy of golf ball impact. Keywords: Composite, Polymeric Foam, EFB Fiber, Tension Distribution, Ansys Workbench 14.0

scholarly journals Adjusting a Momentum-Based Golf Clubhead-Ball Impact Model to Improve Accuracy

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 47
Author(s):  
Behzad Danaei ◽  
William McNally ◽  
Erik Henrikson ◽  
John McPhee
Keyword(s):  
Center Of Mass ◽  
Golf Ball ◽  
Impact Model ◽  
Ball Speed ◽  
Ball Impact ◽  
Kinematic Data ◽  
Impact Location ◽  
The Impact ◽  
Mass Position ◽  
Impact Motion

In this paper, two simple and physically meaningful adjustments were made to a momentum-based clubhead-ball impact model to predict golf ball launch conditions with better accuracy. These adjustments were motivated by two shortcomings of the momentum-based impact model, namely the absence of shaft effects and golf ball deformation. Kinematic data from a golf impact motion capture experiment was used to empirically determine the parameter adjustments that minimized the ball speed and spin errors. It was found that the original model’s ball speed deficiency could be corrected by adding less than 3 g to the clubhead mass, and the amount of added mass correlated with the mass of the shaft. Additionally, the original model’s backspin and sidespin errors were significantly reduced by making a slight adjustment to the golf ball’s center of mass position relative to the impact location. Specifically, moving the golf ball center of mass approximately 0.5 mm downward and 0.07 mm towards the heel reduced the mean backspin and sidespin errors by approximately 85% each.

On the acoustic signature of golf ball impact

2002 ◽  
Vol 20 (8) ◽  
pp. 629-633 ◽  
Author(s):  
Kevin Shannon ◽  
John D. Axe
Keyword(s):  
Golf Ball ◽  
Ball Impact ◽  
Acoustic Signature

Classification of Acceleration Waveforms during Walking by Wavelet Transform

1997 ◽  
Vol 36 (04/05) ◽  
pp. 356-359 ◽  
Author(s):  
M. Sekine ◽  
M. Ogawa ◽  
T. Togawa ◽  
Y. Fukui ◽  
T. Tamura
Keyword(s):  
Wavelet Transform ◽  
Wavelet Analysis ◽  
Center Of Gravity ◽  
Dynamic Responses ◽  
Sequential Data ◽  
Acceleration Signal ◽  
Continuous Dynamic

Abstract:In this study we have attempted to classify the acceleration signal, while walking both at horizontal level, and upstairs and downstairs, using wavelet analysis. The acceleration signal close to the body’s center of gravity was measured while the subjects walked in a corridor and up and down a stairway. The data for four steps were analyzed and the Daubecies 3 wavelet transform was applied to the sequential data. The variables to be discriminated were the waveforms related to levels -4 and -5. The sum of the square values at each step was compared at levels -4 and -5. Downstairs walking could be discriminated from other types of walking, showing the largest value for level -5. Walking at horizontal level was compared with upstairs walking for level -4. It was possible to discriminate the continuous dynamic responses to walking by the wavelet transform.

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