The vibrational mode structure of a golf ball

In this paper, we report the discrete frequencies at which golf balls can vibrate, the mode patterns of these vibrations and how these modes can be excited. There are two broad classes of modes: those that radiate sound waves and those that do not. Both silent and acoustic modes are excited by tangential (i.e. spin-producing) impact forces; only acoustic modes are excited by radial impact forces. Exact analytical results for a homogeneous ball core are compared with finite element numerical results for both a core and a model two-piece ball. Correspondences are readily established for the important low-frequency modes, and the good agreement suggests the validity of these results for real golf balls. The results potentially provide the basis for a rapid, simple and non-destructive method of measuring the effective high-frequency elastic shear modulae of balls (and ball cores) as well as a method for 'tuning' the performance of balls for specific clubs. Some of these aspects are explored further in our companion paper in this issue.     

On the acoustic signature of golf ball impact

In this paper, we present results on the measurement and analysis of the sound that is produced by the sharp impact loading of a golf ball by a flat massive object (e.g. the face of a golf club). We discuss: (a) the motivation for such a study; (b) some necessary background information on how golf balls vibrate; (c) the techniques used to acquire and analyse the data; and (d) an analysis of the sound made by dropping balls on a smooth, massive concrete target surface. These results establish a simple method for rapid and non-destructive measurement of the effective high-frequency elastic shear moduli of balls and ball cores.     

论三小球在大学体育自选课程中炽热的动因与效应

本文就大学生们选修三小球炽热的动因与采用系统科学方法 ,提高大学生健身效益的正反面进行信息加工 ,以扩大教改成果。     

我国“三大球”的滑坡与后备力量的培养

本文通过对我国“三大球”的滑坡,找出导致滑坡的原因：奥林匹克战略的影响;经济基础的影响;未来社会对人才需求竞争影响。再根据“三大球”所具有的特点。作用对后备力量的培养意义以及培养措施进行探讨、研究,这对振兴我国“三大球”运动,提高竞技水平都有积极的作用;并对我国全民健身计划第二期工程的实施产生战略性的深远影响。     

论加强拼抢篮板球技术运用的必要性

本文强调现代篮球竞赛中争抢篮板球的重要性,并对第12、14届世界女篮锦标赛中预赛、复赛、决赛合计14场比赛进行技术统计对比,分析了中国女篮在篮板球上存在的关键问题是拼抢篮板球意识差,自投自抢意识差,积极主动身体对抗能力差,没有较系统把篮板球训练组织在战术训练之内,并提出了相应的训练对策。     

黄谷柳《虾球传》研究资料综述

《虾球传》为现代作家黄谷柳的代表作。对黄谷柳小说创作的研究主要都是以《虾球传》为研究对象的,这些研究分别从作品的内容、形式、创作手法、人物形象等不同角度入手,对作品进行了全方位的解读,但是仍显得较为薄弱。对黄谷柳创作的研究在今后很长一段时间内,依然是一项有待于我们深入的艰巨工作。     

体育教育专业设置球类综合课程的构想

体育教育专业现行的篮、排、足球三门课程以竞技为中心的分科教学模式巳不适合学生的需求和中小学的实际，设置球类综合课程是现实的需要。其综合过程应遵循三条准则：1)还球类运动游戏本原；2)以球类健身知识技能为教学主线：3)以学科重组为综合模式。