Investigation of Stability in Skydiving by the Derivation of State Equation for Body Behavior and Root Analysis

• NAKASHIMA Motomu

  Graduate School of Information Science and Engineering, Tokyo Institute of Technology

• AOYAMA Ayako

  Graduate School of Information Science and Engineering, Tokyo Institute of Technology

抄録

The objective of this study was to investigate the stability during a skydiving freefall, in which the diver has to take various body positions in order to control precisely their distance, velocity, and direction relative to the other divers for group performance. For this objective, the state equation for a simple elliptic cylinder model was initially derived, considering its equations of motion and fluid force characteristics. Next, using the form of the state equation derived for the elliptic cylinder and input/output data obtained from the developed simulation method for the body behavior of the skydiver, the state equations of the skydiver were identified for various body positions. Finally, roots of the state equations were obtained to investigate the stability. As a result, the causes of instability such as the spin and spiral phenomena were clarified as an unstable natural modes, and the stable limit of the body position was obtained as a value of the parameter which is related to the arch magnitude of the diver's body.

収録刊行物

• Journal of Fluid Science and Technology

  Journal of Fluid Science and Technology 6 (2), 264-278, 2011

  一般社団法人 日本機械学会

キーワード

• Bio-Fluid Mechanics
• Stability
• Bio-Motion
• Aeronautical Engineering
• Skydiving

詳細情報

• CRID: 1390282680222384512
• NII論文ID: 130000664747
• DOI: 10.1299/jfst.6.264
• ISSN: 18805558
• Web Site: http://www.jstage.jst.go.jp/article/jfst/6/2/6_2_264/_pdf
• 本文言語コード: en
• データソース種別:
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  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可