Nature in Engineering for Monitoring the Oceans: Towards a Bio-Inspired Flexible Autonomous Underwater Vehicle Operating in an Unsteady Flow
Nature in Engineering for Monitoring the Oceans: Towards a Bio-Inspired Flexible Autonomous Underwater Vehicle Operating in an Unsteady Flow
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DOI：
10.1243/14750902jeme201
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发表时间：
2010-07
期刊：
影响因子：
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通讯作者：
A. Phillips;J. Blake;B. Smith;S. Boyd;G. Griffiths
中科院分区：
文献类型：
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作者：
A. Phillips;J. Blake;B. Smith;S. Boyd;G. Griffiths
人们早就知道，会游泳的海洋动物已经进化出了速度、机动性和效率方面的能力，这是水下航行器所需要的。尽管如此，从自然或生物灵感中获得灵感的解决方案很少用于解决工程挑战。特别是，人们了解到，鱼类有能力改变它们的游泳模式，与自然产生的涡流相互作用，作为一种节约能量的方法，在某些情况下，还可以从水流中提取能量。本文研究了仿生柔性自主水下航行器（AUV）能否利用非定常流动特性来降低其运输成本。建立了一个解析模型，使水下航行器设计者能够预测哪些流动频率激发了柔性圆柱体的固有振动模式。结果表明，通过在非定常流中放置一个柔性圆柱体，例如钝体的下游，可以利用与鱼类使用的类似机制来移动圆柱体上游，除了从流动中提取的动力外，没有任何动力输入。
It has long been understood that swimming marine animals have evolved capabilities in terms of speed, manoeuvrability, and efficiency which are desirable for underwater vehicles. Despite this, solutions inspired by nature, or bio-inspiration, are very rarely applied to solve engineering challenges. In particular, it is understood that fish have the ability to alter their mode of swimming to interact with naturally produced vortices as a method of conserving energy and in certain instances extracting energy from a flow. This paper considers whether a bio-inspired flexible autonomous underwater vehicle (AUV) could exploit unsteady flow features to reduce its cost of transport. An analytical model is developed which allows an AUV designer to predict which flow frequencies excite the natural vibration modes of a flexible cylinder. It is demonstrated that by placing a flexible cylinder in an unsteady flow, such as downstream of a bluff body, a similar mechanism to that used by fish may be exploited to move the cylinder upstream with no power input except that extracted from the flow.