摘要
绿色环保材质的醋酸纤维素乒乓球近年来备受关注。为研究新材料对乒乓球运动特性的影响,基于显式动力学理论并结合有限元方法,建立考虑旋转效应的乒乓球与球拍碰撞模型,研究新材料和赛璐珞2种材质对乒乓球与球拍碰撞后的速度、球与球拍接触时间及能量损失的影响。结果表明:乒乓球反射速度随入射角的增大而减小;球体直径相同、转速和入射速度相同条件下,新材料乒乓球与赛璐珞球相比,球速平均增大约2%。碰撞过程中球与球拍接触时间随乒乓球入射角的增大而增大,乒乓球材质的改变对球体与球拍接触时间影响较小;乒乓球入射角增大,能量损失率随之增加,同一直径、转速和入射速度条件下,新材料乒乓球能量损失率大于赛璐珞球,两者最大相差4.04%,平均能量损失率相差1.43%。研究一定程度上为运动员尽快适应新材料球带来的变化提供了理论参考。
Cellulose acetate table tennis ball which is environmental protection material has been concerned in recent years. In order to study the effect of newmaterials on the characteristics of table tennis ball, the collision model of table tennis and racket was established based on the explicit dynamics theory and fi-nite element method. The effects of new materials and celluloid on reflex speed, residence time and energy lose rate were recorded. The results showed that thereflex speed of table tennis ball decreased with the increase of incident angle, and the ball speed increased by about 2% compared with that of celluloid ball un-der the same sphere diameter and same rotation speed and incidence speed. The contact time of hall and racket increased with the increase of the ealgle of inci-dence of ping-pong ball, and the change of the material of table tennis ball had little effect on the residence time of ball. The energy loss rate increased withthe increase of incident angle, the energy loss rate of the new material was greater than that of the celluloid ball, the maximum difference was 4.04%, and theaverage energy loss rate was 1.43%. The research provides a theoretical reference for athletes to adapt to the changes of new material ball as soon as possible.
出处
《天津体育学院学报》
CAS
CSSCI
北大核心
2017年第1期22-25,30,共5页
Journal of Tianjin University of Sport
基金
国家自然科学基金项目(项目编号:51676131)
国家自然科学基金资助项目(项目编号:51176129)
上海市科委项目(项目编号:13DZ2260900)
关键词
乒乓球
新材料
赛璐珞
碰撞
显式动力学
table tennis ball
new material
celluloid
collision
explicit dynamics
