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Propulsive efficiency of frog swimming with different feet and swimming patterns

机译:不同脚型和游泳方式的蛙泳推进效率

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Aquatic and terrestrial animals have different swimming performances and mechanical efficiencies based on their different swimming methods. To explore propulsion in swimming frogs, this study calculated mechanical efficiencies based on data describing aquatic and terrestrial webbed-foot shapes and swimming patterns. First, a simplified frog model and dynamic equation were established, and hydrodynamic forces on the foot were computed according to computational fluid dynamic calculations. Then, a two-link mechanism was used to stand in for the diverse and complicated hind legs found in different frog species, in order to simplify the input work calculation. Joint torques were derived based on the virtual work principle to compute the efficiency of foot propulsion. Finally, two feet and swimming patterns were combined to compute propulsive efficiency. The aquatic frog demonstrated a propulsive efficiency (43.11%) between those of drag-based and lift-based propulsions, while the terrestrial frog efficiency (29.58%) fell within the range of drag-based propulsion. The results illustrate the main factor of swimming patterns for swimming performance and efficiency.
机译:根据不同的游泳方法,水生和陆生动物具有不同的游泳性能和机械效率。为了探索游泳蛙的推进力,本研究基于描述水生和陆生蹼足形状和游泳方式的数据计算了机械效率。首先,建立简化的青蛙模型和动力学方程,并根据计算流体动力学计算来计算脚上的流体动力。然后,为了简化输入工作的计算,使用了两个链接机制来代表在不同青蛙物种中发现的各种复杂的后腿。根据虚拟工作原理推导出关节扭矩,以计算足部推进的效率。最后,将两只脚和游泳模式结合起来以计算推进效率。水生青蛙表现出基于阻力的推进力和提升力之间的推进效率(43.11%),而陆地蛙的效率(29.58%)落在基于阻力的推进力范围内。结果说明了游泳模式对游泳性能和效率的主要影响。

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