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Study of the thrust-drag balance with a swimming robotic fish

机译:用游泳机器人鱼类的推力拖累平衡研究

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A robotic fish is used to test the validity of a simplification made in the context of fish locomotion. With this artificial aquatic swimmer, we verify that the momentum equation results from a simple balance between a thrust and a drag that can be treated independently in the small amplitude regime. The thrust produced by the flexible robot is proportional to A(2)f(2), where A and f are the respective tail-beat amplitude and oscillation frequency, irrespective of whether or not f coincides with the resonant frequency of the fish. The drag is proportional to U-0(2), where U-0 is the swimming velocity. These three physical quantities set the value of the Strouhal number in this regime. For larger amplitudes, we found that the drag coefficient is not constant but increases quadratically with the fin amplitude. As a consequence, the achieved locomotion velocity decreases, or the Strouhal number increases, as a function of the fin amplitude. Published by AIP Publishing.
机译:机器人鱼用于测试在鱼机背景下进行的简化的有效性。 通过这种人工水产游泳运动员,我们验证了动量方程从一个可以在小幅度制度中独立治疗的推力和拖拉之间的简单平衡。 由柔性机器人产生的推力与A(2)F(2)成比例,其中A和F是相应的尾搏幅度和振荡频率,而不管是否F一致地与鱼的谐振频率一致。 拖动与U-0(2)成比例,其中U-0是游泳速度。 这三种物理量在该制度中设定了Strouhal数的价值。 对于较大的振幅,我们发现拖动系数不是恒定的,但是用翅片幅度立方增加。 结果,作为翅片幅度的函数,所实现的机器速度降低,或者斯特鲁姆数增加。 通过AIP发布发布。

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