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首页> 美国卫生研究院文献>Royal Society Open Science >Modulating yaw with an unstable rigid body and a course-stabilizing or steering caudal fin in the yellow boxfish (Ostracion cubicus)
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Modulating yaw with an unstable rigid body and a course-stabilizing or steering caudal fin in the yellow boxfish (Ostracion cubicus)

机译：带有不稳定刚体的调制偏航和黄色盒鱼（Ostracion cubeus）的航向稳定或操纵尾鳍

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摘要

Despite that boxfishes have a rigid carapace that restricts body undulation, they are highly manoeuvrable and manage to swim with remarkably dynamic stability. Recent research has indicated that the rigid body shape of boxfishes shows an inherently unstable response in its rotations caused by course-disturbing flows. Hence, any net stabilizing effect should come from the fishes' fins. The aim of the current study was to determine the effect of the surface area and orientation of the caudal fin on the yaw torque exerted on the yellow boxfish, , a square cross-sectional shaped species of boxfish. Yaw torques quantified in a flow tank using a physical model with an attachable closed or open caudal fin at different body and tail angles and at different water flow speeds showed that the caudal fin is crucial for controlling yaw. These flow tank results were confirmed by computational fluid dynamics simulations. The caudal fin acts as both a course-stabilizer and rudder for the naturally unstable rigid body with regard to yaw. Boxfishes seem to use the interaction of the unstable body and active changes in the shape and orientation of the caudal fin to modulate manoeuvrability and stability.
机译：尽管盒鱼具有坚硬的甲壳，可以限制身体起伏，但是它们具有很高的机动性，并且能够以极高的动态稳定性进行游泳。最近的研究表明，箱形鱼类的刚体形状在其旋转过程中表现出固有的不稳定响应，这是由扰动水流引起的。因此，任何净稳定作用都应来自鱼鳍。当前研究的目的是确定尾鳍的表面积和方向对施加于黄色箱鱼（一种方形截面的箱鱼）上的偏航扭矩的影响。使用具有可附接的闭合或开放式尾鳍的物理模型在流量罐中对偏航扭矩进行量化，该尾鳍在不同的机体和尾部角度以及不同的水流速度下显示，尾鳍对于控制偏航至关重要。这些流量箱结果已通过计算流体动力学仿真得到证实。尾鳍在偏航方面既是自然不稳定的刚体，又是航向稳定器和舵。盒鱼似乎利用不稳定体的相互作用以及尾鳍形状和方向的主动变化来调节可操纵性和稳定性。

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