Optimization of the size and launch conditions of a discus

Kazuya Seo, Koji Shimoyama, Ken Ohta, Yuji Ohgi, Yuji Kimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationProcedia Engineering
PublisherElsevier Ltd
Pages756-761
Number of pages6
Volume72
DOIs
Publication statusPublished - 2014
Event2014 10th Conference of the International Sports Engineering Association, ISEA 2014 - Sheffield, United Kingdom
Duration: 2014 Jul 142014 Jul 17

Other

Other2014 10th Conference of the International Sports Engineering Association, ISEA 2014
CountryUnited Kingdom
CitySheffield
Period14/7/1414/7/17

Fingerprint

Computational fluid dynamics
Angle of attack
Aerodynamics
Air
Metals

Keywords

  • Discus
  • Launch conditions
  • Optimization
  • Size

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Seo, K., Shimoyama, K., Ohta, K., Ohgi, Y., & Kimura, Y. (2014). Optimization of the size and launch conditions of a discus. In Procedia Engineering (Vol. 72, pp. 756-761). Elsevier Ltd. https://doi.org/10.1016/j.proeng.2014.06.128

Optimization of the size and launch conditions of a discus. / Seo, Kazuya; Shimoyama, Koji; Ohta, Ken; Ohgi, Yuji; Kimura, Yuji.

Procedia Engineering. Vol. 72 Elsevier Ltd, 2014. p. 756-761.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Seo, K, Shimoyama, K, Ohta, K, Ohgi, Y & Kimura, Y 2014, Optimization of the size and launch conditions of a discus. in Procedia Engineering. vol. 72, Elsevier Ltd, pp. 756-761, 2014 10th Conference of the International Sports Engineering Association, ISEA 2014, Sheffield, United Kingdom, 14/7/14. https://doi.org/10.1016/j.proeng.2014.06.128
Seo K, Shimoyama K, Ohta K, Ohgi Y, Kimura Y. Optimization of the size and launch conditions of a discus. In Procedia Engineering. Vol. 72. Elsevier Ltd. 2014. p. 756-761 https://doi.org/10.1016/j.proeng.2014.06.128
Seo, Kazuya ; Shimoyama, Koji ; Ohta, Ken ; Ohgi, Yuji ; Kimura, Yuji. / Optimization of the size and launch conditions of a discus. Procedia Engineering. Vol. 72 Elsevier Ltd, 2014. pp. 756-761
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