足球运动中S型任意球的分析与研究
发布时间：2019-07-09 15:50
【摘要】：在现代足球154年的历史岁月中,诞生了无数令人印象深刻的进球,而其中有一类,因其自身的特殊性质,媒体和大众舆论常常使用这样一个名称来形容它的诡异——Violate the laws of Physics Goal (违反物理学规律的进球),这便是S型任意球。本文收集与整理大量S型任意球影像与访谈材料,探索关于足球运动中S型任意球的界定、原理和发生机制,进而提出训练建议,为S型任意球的相关研究提供参考。本文以流体力学中 Bernoulli's principle、Magnus Effect、Karman Vortex Street等相关理论为基础,以数学方法为手段界定S型任意球,推导和计算S型任意球的形成机理和发生机制;通过大量相关影像资料,归纳分析S型任意球的特征;使用定量分析法,通过对S型任意球相关影响因子的准确赋值,使对S型任意球轨迹与形成的探索进一步细化,更加科学的、客观的揭示S型任意球的形成与运动规律,把握本质,理清关系,并绘图预测趋势和走向;同时查阅文献资料,总结当下国内外前沿的下肢快速力量训练理论以及优秀运动员的成功经验,为S型任意球的训练提供可行建议。通过研究得到:(1) S型任意球形成的基本原理为Karman Vortex Street,足球飞行过程中雷诺数介于3×105与3×106之间时,在足球后方形成的非线性涡街是S型轨迹产生的本质。(2) S型任意球的形成需要两个必要条件,第一是不旋转条件,击球时需控制足球在飞行过程中几乎不带有产生横截面上的角速度;第二是高速条件,必须让足球在飞行过程中存在一个时间片段,该时间片段内,足球的速度标量始终不低于“逃逸速度Vmin”,而该时间片段的长度,决定S型轨迹显著程度。(3)以标准大气压和20℃为通常状况,通过计算,足球逃逸速度Vmin=21.0m/s。(4)逃逸速度Vmin的主要影响因子为空气密度ρ、空气黏性系数μ;不同气温下空气密度ρ、空气黏性系数μ也随着变化,通过计算与绘图,发现温度较低时,产生S型轨迹需要的逃逸速度Vmin也越小。(5) S型任意球训练以发展下肢快速力量和针对性技巧为主,进行向心结合不同速度离心训练和技巧性训练。
文内图片：
图片说明：图１交点定义法示意图逡逑
[Abstract]:In the 154th history of modern football, countless impressive goals have been born, and one of them, because of its own special nature, the media and public opinion often use such a name to describe its weirdness-Violate the laws of Physics Goal (goals against the laws of physics), this is the S-shaped free-kick. In this paper, a large number of S-type free-kick images and interview materials are collected and sorted out, the definition, principle and occurrence mechanism of S-type free-kick in football are explored, and then the training suggestions are put forward, which provides a reference for the related research of S-type free-kick. Based on Bernoulli's principle,Magnus Effect,Karman Vortex Street and other related theories in fluid mechanics, this paper defines S-type free-kick by means of mathematical method, deduces and calculates the formation mechanism and occurrence mechanism of S-type free-kick, sums up and analyzes the characteristics of S-type free-kick through a large number of related image data. By using quantitative analysis method, through the accurate assignment of the influencing factors of S-type free-kick, the exploration of the trajectory and formation of S-type free-kick is further refined, and the formation and movement law of S-type free-kick are revealed more scientifically and objectively, the essence is grasped, the relationship is clarified, and the trend and trend are predicted by drawing. At the same time, the literature is consulted to summarize the theory of rapid strength training of lower extremity at home and abroad and the successful experience of excellent athletes, so as to provide feasible suggestions for the training of S-type free kick. The results show that: (1) the basic principle of the formation of S-type free-kick is that when the Reynolds number is between 3 脳 10 ~ 5 and 3 脳 10 ~ 6 in the flight process of Karman Vortex Street, football, the nonlinear vortex street formed in the rear of football is the essence of S-shaped trajectory. (2) the formation of S-type free-kick requires two necessary conditions, the first is the condition of non-rotation, and the angular velocity of football is almost without cross section in the course of hitting the ball; The second is the high speed condition, in which the velocity scalar of the football is not lower than the "escape velocity Vmin", and the length of the time segment determines the remarkable degree of the S-shaped trajectory. (3) taking the standard atmospheric pressure and 20 鈩，
本文编号：2512258
文内图片：
图片说明：图１交点定义法示意图逡逑
[Abstract]:In the 154th history of modern football, countless impressive goals have been born, and one of them, because of its own special nature, the media and public opinion often use such a name to describe its weirdness-Violate the laws of Physics Goal (goals against the laws of physics), this is the S-shaped free-kick. In this paper, a large number of S-type free-kick images and interview materials are collected and sorted out, the definition, principle and occurrence mechanism of S-type free-kick in football are explored, and then the training suggestions are put forward, which provides a reference for the related research of S-type free-kick. Based on Bernoulli's principle,Magnus Effect,Karman Vortex Street and other related theories in fluid mechanics, this paper defines S-type free-kick by means of mathematical method, deduces and calculates the formation mechanism and occurrence mechanism of S-type free-kick, sums up and analyzes the characteristics of S-type free-kick through a large number of related image data. By using quantitative analysis method, through the accurate assignment of the influencing factors of S-type free-kick, the exploration of the trajectory and formation of S-type free-kick is further refined, and the formation and movement law of S-type free-kick are revealed more scientifically and objectively, the essence is grasped, the relationship is clarified, and the trend and trend are predicted by drawing. At the same time, the literature is consulted to summarize the theory of rapid strength training of lower extremity at home and abroad and the successful experience of excellent athletes, so as to provide feasible suggestions for the training of S-type free kick. The results show that: (1) the basic principle of the formation of S-type free-kick is that when the Reynolds number is between 3 脳 10 ~ 5 and 3 脳 10 ~ 6 in the flight process of Karman Vortex Street, football, the nonlinear vortex street formed in the rear of football is the essence of S-shaped trajectory. (2) the formation of S-type free-kick requires two necessary conditions, the first is the condition of non-rotation, and the angular velocity of football is almost without cross section in the course of hitting the ball; The second is the high speed condition, in which the velocity scalar of the football is not lower than the "escape velocity Vmin", and the length of the time segment determines the remarkable degree of the S-shaped trajectory. (3) taking the standard atmospheric pressure and 20 鈩，
本文编号：2512258
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