浅谈“香蕉球”的力学原理 毕业论文.docVIP

学号常 州 大 学 论文 （ 2010 届） 题 目 浅谈“香蕉球”的力学原理 学 生 学 院 机械工程学院 专业班级 校内指导教师 专业技术职务 校外指导老师 专业技术职务 二○Discussion on Mechanical Principle of Banana Ball Abstract :The article talks about magical banana ball on the court ,Using dynamics to solve the movement of the ball and the analysis of forces on it,and then focusing on the principle of the banana ball from a fluid mechanics standpoint. Key Words : banana ball ; Bernoullis Equation ; h y d r o me c h a n i c s 摘要····································································Ⅰ 目次····································································II 1 引言··································································1 2 伯努利原理····························································2 2.1 伯努利原理··························································2 2.2 伯努利原理在足球中的应用············································2 3 香蕉球的受力分析······················································3 3.1 粘滞阻力····························································3 3.2 压差阻力····························································3 3.3 附加作用力··························································4 4 流体力学原理 ·························································5 4.1 “香蕉球”的流体力学原理············································5 参考文献································································6 1 引言 “香蕉球”，是足球运动技术名词(英语banana ball）。指足球踢出后，球在空中向前并作弧线运行的踢球技术。弧线球常用于攻方在对方禁区附近获得直接任意球时，利用其弧线运行状态，避开人墙直接射门得分。当代足坛帅哥大卫·贝克汉姆就是射“香蕉球”的好手。他主罚任意球时，往往使出“香蕉球”的绝招，让对方守门员无所适从。下面我们试着探讨这个奇妙的现象。 2 伯努利原理 2.1伯努利原理 伯努利原理认为:“在流水或气流里,如果流速小,对旁侧的压力就大,如果流速大,对旁侧的压力就小。”足球队员用脚踢球时,只踢球的一小部分,把球“搓”起来,球受力,就发生旋转,而当球在空中高速旋转并向前飞行时,它属于刚体的一般运动,它包括了刚体的平移、定轴转动、定点运动等。作为一般运动的刚体上的任一点的速度,等于基点的速度与该点随刚体绕基点转动速度的矢