2026-08-26 ハーバード大学
＜関連情報＞
- https://seas.harvard.edu/news/going-over-top
- https://link.springer.com/article/10.1007/s00332-026-10267-7
キイキングの最適な戦略：スイングを反転させるためのアクティブポンピング Optimal Strategies for Kiiking: Active Pumping to Invert a Swing
Petur Bryde,Ian C. Davenport & L. Mahadevan
Journal of Nonlinear Science Published:15 July 2026
DOI:https://doi.org/10.1007/s00332-026-10267-7
Abstract
Kiiking is an extreme sport in which athletes alternate between standing and squatting to pump a swing with rigid supporting arms until it completes a full rotation. A minimal model of the task may be cast in terms of an active pendulum driven by varying its length, and raises the question of optimal strategies for this problem at the nexus of physics and control. We show that a time-optimal control perspective, subject to known biomechanical constraints which aims to maximize the potential energy gain at the end of each cycle explains observations of athletic performance. When accounting for air drag, our theoretical framework is quantitatively consistent with experimental observations and elucidates the importance of strength and timing while pointing to the ultimate limits of kiiking.
