Optimization of the size and launch conditions of a discus
Optimization of the size and launch conditions of a discus
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优化铁饼的尺寸和发射条件
DOI：
10.1016/j.proeng.2014.06.128
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Yuji Ohgi
中科院分区：
文献类型：
--
作者：
Kazuya Seo;Koji Shimoyama;Yuji Kimura;Ken Ota;Yuji Ohgi
本文介绍了铁饼的大小和发射条件的优化。优化的目标函数是飞行距离。飞行距离越远越好。考虑了14个设计变量。十四个中的八个与投掷者的技巧有关。它们决定了发射条件，当他或她投掷时，这些条件由投掷者控制。其他六个变量与设备的设计有关。这些是铁饼的尺寸（宽度，厚度，金属边缘的半径和每边平坦中心区域的直径），对称轴上的惯性矩，最后是铁饼的质量。利用计算流体动力学（CFD）技术估算了尺寸和攻角对气动数据的依赖性。典型的CFD结果，包括失速的影响，通过与实验数据的比较结果得到证实。因此，最长的飞行距离可以达到79米。为了做到这一点，对称轴上的初始横摆角速度应最大化。质量应该最小。对称轴上的惯性矩、扁平中心区域的直径和宽度应设计得大。铁饼的空气流入应该在开始飞行时从上方进入。
This paper describes optimization of the size and launch conditions of a discus. The objective function for optimization is the flight distance. Longer flight distance is better. Fourteen design variables are considered. Eight of the fourteen are concerned with the skill of the thrower. They determine the launch conditions, which are controlled by the thrower when he or she throws. The other six variables are concerned with the design of the equipment. These are the dimensions of the discus (width, thickness, radius of the metal rim and diameter of the flat center area on each side), the moment of inertia on the axis of symmetry and finally the mass of the discus. The dependences of size and the angle of attack on the aerodynamic data are estimated by using CFD (computational fluid dynamics) technique. Typical CFD results, including the effect of stalling, were confirmed by comparing the results with experimental data. As a result, the longest flight distance that could be achieved was 79 meters. In order to do this, the initial yaw rate on the axis of symmetry should be maximized. The mass should be the smallest. The moment of inertia on the axis of symmetry, the diameter of the flat center area and the width should be designed to be large. The air inflow to the discus should arrive from the upper side at the very beginning of the flight.