Computer simulation of one-handed backhand groundstrokes in tennis
Başlık çevirisi mevcut değil.
- Tez No: 586425
- Danışmanlar: Dr. MARK KING, Dr. SEAN MITCHELL
- Tez Türü: Doktora
- Konular: Bilgisayar Mühendisliği Bilimleri-Bilgisayar ve Kontrol, Computer Engineering and Computer Science and Control
- Anahtar Kelimeler: backhand, simulation model, activation profiles, wrist loading, off-centre impacts, tennis elbow
- Yıl: 2008
- Dil: İngilizce
- Üniversite: Loughborough University
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 237
Özet
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Özet (Çeviri)
A subject-specific, torque-driven, 3D computer simulation model with eight segments was developed to investigate the effects of different variables belonging to the racket and player on the wrist and elbow loadings in one-handed tennis backhand groundstrokes. Wobbling masses were included to represent soft tissue movement. The stringbed was represented by nine point masses connected to each other and the racket frame with elastic springs. There were twelve rotational degrees of freedom: three at the shoulder, two at the elbow, two at the wrist, three at the grip and two between the racket handle and racket head. Seven pairs of torque generators were used to control (via activation profiles) the joint angle changes in the model. An elite player was chosen to perform consistent and high standard backhand topspin strokes and a Vicon System was used to record the performances. The simulation model was matched to a typical performance by varying the activation profiles to minimize the difference between simulation and performance in terms of joint and racket angles. Once matched, the model variables in question were perturbed using single simulations with fixed activation profiles and the effect on the loading at the wrist and elbow observed along with the changes in kinematics. The results showed that off-centre impacts substantially increase the risk of injury by increasing the net torques at wrist by up to seven times. For a centre impact, maximum wrist flexion torque increased by up to 20% and 11% for a 20% decrease in moment of inertia and for a 20% increase in mass, respectively. Maximum wrist extension torque for an off-centre impact increased by 11% when the grip stiffness values were doubled. In contrast, the racket frame flexibility and soft tissue movement in the arm had negligible influence on the wrist and elbow. This study suggests that due to high torques obtained in the wrist extensors, the off-centre impacts below the longitudinal axis of the racket may be a substantial contributing factor for 'tennis elbow'. In the future, the model can be used for further investigations on the technique of the backhand stroke.
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