The tail of a small killer whale was the most effective

U.S. scientists have simulated the movement of the caudal fin of some species of cetaceans, depending on the shape and kinematics of the movement and chose based on that the most effective tail. His owner was a small whale, with the most favorable kinematic characteristics, at Beluga, but with a quick tail — have balsalobre prodelin. Article published in the Journal of the Royal Society Interface.

So as waterfowl specific motion is associated with a given shape of the tail, the researchers suggest that there are the best combinations of shape and way of movement. As models, many researchers choose representatives cetaceans: all thanks to their high speed, efficient movement and maneuverability. These qualities are achieved through the circulation of power: animal driven tail fins and they bend for better repulsion from water.

Active study of the movement of aquatic animals began in the 1960-ies. English mathematician Michael James Lighthill (Lighthill Michael James) and American engineer Theodore Yaotsu-Woo (Theodore Yao-tsu Wu) described in his works (1, 2) the movement of fish and cetacean mammals from the position of non-stationary forces in the potential field cases extended body and a vibrating plate, respectively. Since then researchers have found many patterns, for example, that the aspect ratio of the fin and the scope of the caudal fin greatly influence the resulting promoting the strength and efficiency of movement. A more detailed study of the behavior of the tail allowed the scientists to detect the dependence between the shape of the fin and the kinematics of the tail — how it bends and what the length rises.

A new look at the problem of the movement of marine animals have also made the laws of scale — dependence behavior of mechanical quantities from the size of the object, in 2014 Mattia Gazzola (Mattia Gazzola), together with colleagues from Harvard University directly tied to the speed of movement and formo-kinematic variables such as body length, amplitude and frequency of the swing of the tail.

Ayancık Fatma (Fatma Ayancik) with their colleagues from Lehigh University and West Chester University have studied how changing the shape and kinematics of self-propelled tail of cetaceans are affecting the movement as a whole. They chose five model the tail fins of the representatives of the cetaceans: Beluga whale (Delphinapterus leucas), bottlenose dolphins (Tursiops truncatus), killer whales (Orcinus orca), balsalobre prodelin (Stenella plagiodon) and small killer whales (Pseudorca crassidens).

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