リズムがあなたを(より速く)動かす(The Rhythm is Gonna Get You (Moving Faster))

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2023-10-03 デューク大学(Duke)

◆デューク大学の研究者は、未来の動物型ロボットの動きにリズムが重要であり、これまでその側面が見過ごされてきたと指摘しています。動物やロボットの運動には、異なるリズムが効率を向上させる可能性があり、これは競技のスイマーやランナーにも適用できます。

◆この研究は、動物やロボットが運動効率を最適化するためにリズムを取り入れる方法を提案し、デザインが芸術の一形態であることを強調しています。

<関連情報>

運動リズムがパワーとスピードを生む Locomotion rhythm makes power and speed

A. Bejan,U. Gunes & H. Almahmoud

Scientific Reports  Published:28 August 2023

DOI:https://doi.org/10.1038/s41598-023-41023-6

リズムがあなたを(より速く)動かす(The Rhythm is Gonna Get You (Moving Faster))

Abstract

This article addresses two questions, why certain animals (frogs, breaststroke swimmers, hovering fliers, jellyfish) push rapidly against the surrounding fluid and then reach forward slowly, and whether this rhythm of propulsion is a manifestation of the universal phenomenon of design evolution in nature. Emphasis is on the distribution of time periods of locomotion in which, during the driving phase of cyclic movement (the motive stroke, phases 1 and 2, in alternating sequence with the dissipative stroke, phase 3), the work is generated (phase 1) and dissipated (phase 2). The relative lengths of the characteristic times t1 and t2 of the phases 1 and 2, are predicted. The relative duration of the proposed three phases of a cycle is the ‘rhythm’. The analysis is based on a model of how the effective cross-sections of the stroking body parts impact the surrounding medium, water, or air, and the total power required to account for the kinetic energy losses during phases 2 and 3, which are due to drag forces posed by the surrounding medium. The body configuration (limbs’ cross-sections) determines the limbs’ velocities that maximize mean power, and the times t1 and t2 within the motive stroke. Emphasis is placed on the freedom to change the evolving design. Freedom is represented in two ways: the number of degrees of freedom in changing the dimensions of the model and its deformation in time, and the effect that evolutionary changes have on the access that the body has to its available space. Freedom to change the locomotion design leads to greater power and speed.

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