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首页> 外文期刊>Ocean Engineering >Proposed kinematic model for fish-like swimming with two pitch motions
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Proposed kinematic model for fish-like swimming with two pitch motions

机译：拟议的具有两个俯仰运动的类鱼游泳运动学模型

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摘要

In the present investigation a new kinematic model for a fish-like swimming is presented. In this model the foil has two rotational motions in order to approach of the fish swimming performance. This kinematic model is a generalized model for flapping foil because it introduces caudal-to-heave ratio (is ratio of caudal length to heave amplitude) which has not been considered. In the present work the proposed kinematic model can be evaluated in Cylindrical coordinate, while it involves with nonlinear hydrodynamic and propulsion models. This kinematic model can switch to Cartesian coordinate when the caudal-to-heave ratio is infinitive value. The foil experiences the diverse effective angle of attack profile due to the influence of the caudal length in association with other kinematic parameters. It is shown that increase in foil-pitch amplitude decreases the angle of attack and hence, thrust reduces in thrust-based condition. Extreme increasing of foil-pitch amplitude leads the angle of attack to switch to drag-based condition and high drag production results from these changes. Moreover, it is shown that in the limited caudal-to-heave ratio the foil may have the better propulsive performance with reasonable thrust. Furthermore, the optimum Strouhal number and foil-pitch amplitude for fish-like swimming are computed from 0.2 to 0.4 and from 300 to 400, respectively, which are in agreement with observed results in the nature. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在本研究中，提出了一种新的鱼样游泳运动学模型。在该模型中，金属箔具有两个旋转运动，以接近鱼的游泳性能。该运动学模型是拍打箔的通用模型，因为它引入了未考虑的尾高比（即尾长与升高幅度之比）。在目前的工作中，所提出的运动学模型可以在圆柱坐标系中进行评估，而它涉及非线性流体动力和推进模型。当尾高比为不定式时，该运动学模型可以切换到笛卡尔坐标。由于尾长的影响以及其他运动学参数的影响，金属箔经历了不同的有效攻角。结果表明，铝箔间距的增加会减小迎角，因此在基于推力的情况下推力会减小。箔距变化幅度的极大增加导致攻角切换到基于阻力的状态，并且这些变化导致了高阻力产生。而且，已经表明，在有限的尾高比下，箔片可以在合理的推力下具有更好的推进性能。此外，分别计算出鱼状游泳的最佳斯特劳哈尔数和箔节距幅度分别为0.2到0.4和300到400，这与自然界的观察结果是一致的。 （C）2015 Elsevier Ltd.保留所有权利。

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