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首页> 外文期刊>International journal of design & nature and ecodynamics >VIDEO IMAGES AND UNDULATORY MOVEMENT EQUATION OF PANGASIUS SANITWONGSEI'S CAUDAL FIN OF STEADY SWIMMING FISH
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VIDEO IMAGES AND UNDULATORY MOVEMENT EQUATION OF PANGASIUS SANITWONGSEI'S CAUDAL FIN OF STEADY SWIMMING FISH

机译：南美白对虾（PANGASIUS SANITWONGSEI）稳定游泳鱼尾鳍的视频图像和波动运动方程

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Experimental hydrodynamics imaging of four Pangasius sanitwongsei were considered. A quantitative characterization of caudal fin is presented in this article. Steady swimming of four P. sanitwongsei with different total length was studied experimentally and taped by high-speed digital video, and undulatory movement of each fish at different velocity was revealed. The pattern of body undulatory movement of the fish was drawn from the video images. Three main factors that determine the fish swimming behavior are Reynolds number, Strouhal number and shape. In this study, Lf/L was chosen as a characteristic of shape, where Lf was the distance from the start of the head to the end of the head. This is a major point and displays less variation of head to the more variation of the body and caudal fin. L is the length of the fish body. The relationship between Reynolds number and Strouhal number of four P. sanitwongsei with different Lf/L were studied here. Then, the relationship between effective non-dimensional parameters in thrust force and kinematic parameters was found. As a result, an experimental equation was formulated. This equation indicates that, as much as the ratio of the end part of fish with high undulatory movement (body and caudal fin) to the total length goes up, the ratio of amplitude to the total length increases. Consequently, there was an increase in displacement and thrust force also. Then, undulatory movement equation of fish swimming was calculated by fitting a second-order function that describes wave amplitude of this type of fish. All the finding in these researches could be applied to design a robotic fish.
机译：考虑了四个Pangasius sanitwongsei的实验水动力成像。本文介绍了尾鳍的定量特征。实验研究了四种总长不同的南美白对虾的稳定游泳，并通过高速数字录像进行了录音，并揭示了每种鱼类在不同速度下的起伏运动。从视频图像中得出鱼的身体波动的模式。决定鱼类游泳行为的三个主要因素是雷诺数，斯特劳哈尔数和形状。在这项研究中，选择Lf / L作为形状的特征，其中Lf是从头的起点到头的终点的距离。这是一个重点，头部的变化较小，而身体和尾鳍的变化较大。 L是鱼体的长度。研究了不同Lf / L的4种桑尼旺黄蘑菇的雷诺数与斯特劳哈尔数的关系。然后，找到推力中有效的无量纲参数与运动学参数之间的关系。结果，制定了实验方程。该方程式表明，随着高波动运动的鱼的末端部分（身体和尾鳍）与总长度的比率增加，幅度与总长度的比率增加。因此，位移和推力也增加了。然后，通过拟合描述这类鱼的波幅的二阶函数来计算鱼游泳的波动运动方程。这些研究中的所有发现都可以应用于设计机器鱼。

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