The effects of ball impact location and grip tightness on the arm, racquet and ball for one-handed tennis backhand groundstrokes

Download

4.pdf

Date

2012-4

Author

King, Mark A.
Kentel, Behzat B.
Mitchell, Sean R.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

85
views

134
downloads

A torque-driven, 3D computer simulation model of an arm–racquet system was used to investigate the effects of ball impact location and grip tightness on the arm, racquet and ball during one-handed tennis backhand groundstrokes. The stringbed was represented by nine point masses connected to each other and the racquet frame with elastic springs and three torsional spring-dampers between the hand and the racquet were used to represent grip tightness. For each perturbation of nine impact locations and grip tightness, simulations were run for a 50 ms period starting with ball–racquet impact. Simulations showed that during off-centre impacts below the longitudinal axis of the racquet, the wrist was forced to flex up to 161 more with up to six times more wrist extension torque when compared to a centre impact simulation. Perturbing grip tightness had no substantial effect on centre impact simulations. However, for off-centre impacts (below the longitudinal axis of the racquet) a tight grip condition resulted in a substantial decrease in racquet rotation within the hand (less than 21) and an increase of 61 in wrist flexion angle when compared to the equivalent simulation with a normal grip. In addition there was approximately 20% more wrist extension torque when compared with equivalent off-centre impact simulation with a normal grip. Consequently off-centre impacts below the longitudinal axis of the racquet may be a substantial contributing factor for tennis elbow injuries with a tight grip aggravating the effect due to high eccentric wrist extension torques and forced wrist flexion.

Subject Keywords

Backhand, Off-centre impacts, Grip tightness, Simulation model

URI

https://hdl.handle.net/11511/52015

Journal

Journal of Biomechanics

DOI

https://doi.org/10.1016/j.jbiomech.2011.12.028

Collections

Department of Mechanical Engineering, Article

Suggestions

OpenMETU
Core

The stress response and onset of yield of rotating FGM hollow shafts Akis, T.; Eraslan, Ahmet Nedim (2006-11-01) An analytical model is developed to study the stress response and the yielding of rotating functionally graded hollow shafts in the framework of generalized plane strain. The modulus of elasticity and the uniaxial yield limit of the shaft material are assumed to vary radially in nonlinear forms. It is shown that different modes of plasticization may take place. Analytical expressions for the critical values of the material parameters leading to different modes of plastic deformation and the corresponding el...
Application of spatial H-infinity control technique for active vibration control of a smart beam Kircali, Oemer Faruk; Yaman, Yavuz; Nalbantoglu, Volkan; Şahin, Melin; Karadal, Fatih Mutlu (2007-05-12) This study presents the design and implementation of a spatial H-infinity controller for the active vibration control of a cantilevered smart beam. The smart beam consists of a passive aluminum beam (507x51x2mm) and eight symmetrically surface bonded SensorTech BM500 type PZT (Lead-Zirconate-Titanate) patches (25x20x0.5mm). PZT patches are used as actuators and a laser displacement sensor is used as sensor. The smart beam was analytically modelled by using the assumed-modes method. The model only included t...
Application of spatial h ∞ control technique for active vibration control of a smart beam Ömer Faruk, Kırcalı; Yaman, Yavuz; Volkan, Nalbantoğlu; Şahin, Melin; Fatih Mutlu, Karadal (null; 2007-06-04) This study presents the design and implementation of a spatial H∞ controller for the active vibration control of a cantilevered smart beam. The smart beam consists of a passive aluminum beam (507x51x2mm) and eight symmetrically surface bonded SensorTech BM500 type PZT (Lead-Zirconate-Titanate) patches (25x20x0.5mm). PZT patches are used as actuators and a laser displacement sensor is used as sensor. The smart beam was analytically modelled by using the assumed-modes method. The model only included the first...
The effects of tine coupling and geometrical imperfections on the response of DETF resonators Azgın, Kıvanç (IOP Publishing, 2013-12-01) This paper presents a two-degree-of-freedom analytical model for the electromechanical response of double ended tuning fork (DETF) force sensors. The model describes the mechanical interaction between the tines and allows investigation of the effect of a number of asymmetries, in tine stiffness, mass, electromechanical parameters and load sharing between the tines. These asymmetries are introduced during fabrication (e. g., as a result of undercut) and are impossible to completely eliminate in a practical d...
The aerodynamic effects of blade pitch angle on small horizontal axis wind turbines Kaya, Mehmet Numan; Uzol, Oğuz; Ingham, Derek; Köse, Faruk; Buyukzeren, Riza (2022-01-01) © 2022, Emerald Publishing Limited.Purpose: The purpose of this paper is to thoroughly investigate the aerodynamic effects of blade pitch angle on small scaled horizontal axis wind turbines (HAWTs) using computational fluid dynamics (CFD) method to find out the sophisticated effects on the flow phenomena and power performance. Design/methodology/approach: A small HAWT is used as a reference to validate the model and examine the aerodynamic effects. The blade pitch angle was varied between +2 and −6 degrees,...

Citation Formats

M. A. King, B. B. Kentel, and S. R. Mitchell, “The effects of ball impact location and grip tightness on the arm, racquet and ball for one-handed tennis backhand groundstrokes,” Journal of Biomechanics, pp. 1048–1052, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52015.