The Analysis of Arm-Swing of Volleyabll Spike --By Kinetics Chain Theory

• Main Authors: Liu Gin-chang, 劉錦璋
• Other Authors: Hyang Chen-Fu
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/14035886128733625597

碩士 === 國立師範大學 === 體育學系 === 86 === Sport is full of examples of motions with open-linked and multi-segment systems. The motions of segments participating in arm-swing (or throwing)skills are generally sequenced in a proximal-to-distal fashion. The prupose of segments during the action of arm-swing phase of volleyball spike. The arm-swing phase of volleyball spike is a multi-segment system withour any implement, so it was a basic example to help explain the proximal-to-distal sequential pattern of the motion by kinetics. The forward dynamicswas used to the modeling of the action, and the Lagrangian Equtions of Motion are applied on it. Assuming the motion system with two segments was moving in two-dimensional plane. The final differential equations of Lagrange''s equations were nonlinera, and could not be solved by exactly solution. The numerical method of Mathematica software was used to get the numerical solution. The initial conditions and segmental constants from the experimental motions that demonstrated by two male elite spikers from national team were used to substitute into the equations of motions. Then approximate to the borndary condition of impact event of arm-swing phase by changing the moments of each segment. After comparing modeling and real motion, the conclusions could be described as following:1.In modeling, the maximum angular velocity of distal segment（ｗd-max）and the maximum linear velocity of the endpoint of distal segment（Ｖd-max）are appear at the time when two segments get straight.2.In experimental process of the swing phase, ｗd-max and Ｖd-max both appeared prior to impact. But in modeling,ｗd-max and Ｖd-max both appeared after impact event.With the same initial conditional and boundary conditions, the process of the model exhibit more effective then that of experimental motion.