Please use this identifier to cite or link to this item: http://rportal.lib.ntnu.edu.tw:80/handle/77345300/79326
Title: 優秀標槍選手投擲時槍體受力之三維動力學分析
A 3-D Dynamic Analysis of Applied Forces on Javelin during Final Thrust by an Elite Javelin Thrower
Authors: 國立臺灣師範大學體育學系
古國宏
黃長福
蔡於儒
Issue Date: 1-Jun-2006
Publisher: 中華民國大專院校體育總會
Abstract: Purposes: According to the javelin rules, a throw is valid only if the tip strikes the ground before any other part of the javelin. Therefore, it is important to control precisely the distribution of applied forces to the javelin for further distance and tip-first landing. Methods: Two synchronized Redlake high-speed cameras (250 Hz) were used to videotape an elite thrower and a javelin with three fixed non-collinear markers. The aerodynamic and inverse dynamics were taken into account in the 3D dynamic analysis. Rerults: When the hand gripped the javelin, the applied force was mainly distributed to the axial direction. At release, the javelin was controlled by distal parts of fingers, and the distribution of force was changed from the axial to the lateral direction. The lateral torque was significantly larger than the axial torque all the phase. The peaks of lateral and axial torques were 24.08 and 1.31 Nm respectively. Conclusions: The results calculated by the inversed dynamics were similar to those by previous research. In addition, the method adopted in this study is simple and has no interference of connecting wire, which could be used for further javelin research.
URI: http://rportal.lib.ntnu.edu.tw/handle/77345300/79326
ISSN: 1563-3470
Other Identifiers: ntnulib_tp_F0104_01_038
Appears in Collections:教師著作

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