生物学にヒントを得た設計により、曳航式ソナーアレイの空気抵抗と騒音発生を低減(Bioinspired design reduces drag and noise production for towed sonar arrays)

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2024-04-01 カリフォルニア大学バークレー校(UCB)

生物学にヒントを得た設計により、曳航式ソナーアレイの空気抵抗と騒音発生を低減(Bioinspired design reduces drag and noise production for towed sonar arrays)Illustration of the design concepts and fluid domain setup: (a) Schematic plot of a TSA during missions. (b) Bioinspired riblet topologies. (c) Fluid domain setup that represents the envisaged operating conditions. (d) Region-based polyhedral mesh setup. (Image courtesy of Gu Research Group)

バークレーの研究チームは、サメの皮膚を模倣したテクスチャーを用いて、曳航ソナーアレイ(TSA)のドラッグと流体ノイズを低減することに成功しました。これにより、より効果的で効率的な新世代のTSAの開発が可能になります。彼らはリブレットと呼ばれる特殊なパターンが水中環境でノイズを軽減することを発見し、さらに微細なパターンのリブレットはドラッグをさらに25.7%低減させることを示しました。このバイオインスパイアドな研究は、水中の乗り物や機器の機能性を向上させ、環境にも利益をもたらす可能性があります。

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曳航式ソナーアレイにおける流体誘起ノイズの緩和に対するバイオインスパイアされたリブレットトポグラフィの影響 Influence of bioinspired riblet topographies on the mitigation of flow-induced noise in towed sonar arrays

Zixiao Wei, Zilan Zhang, Dahyun Daniel Lim, Justin Rey, Matthew Jones, Grace X. Gu
Extreme Mechanics Letters  Available online:29 January 2024
DOI:https://doi.org/10.1016/j.eml.2024.102130

Abstract

The hydrodynamic optimization of marine vehicles and devices is a critical area of research, especially regarding the diminution of flow-induced drag pertinent to towed sonar arrays. The utilization of bio-inspired riblets, which emulate the skin of rapid marine predators such as sharks, has been posited as a viable strategy to mitigate hydrodynamic drag. Nonetheless, the implications of these riblets on the concurrent acoustical emissions during flow-array interaction remain not well understood. This study conducts an in-depth investigation into the performance of bioinspired riblet topologies in attenuating flow-induced noise in towed sonar arrays, scrutinizing their effectiveness across laminar and turbulent flow regimes. In laminar flow regimes, the study observes that riblet structures have the potential to reduce noise but at the cost of increased drag for towed arrays. Conversely, in turbulent flow conditions, the effectiveness of riblets is significantly enhanced. Particularly, rectangular riblets demonstrate a notable reduction in noise by up to 14.3%, along with a 5.1% decrease in hydrodynamic drag, in comparison to a smooth array surface. Additionally, our parametric study reveals that riblets with finer, more closely spaced geometries can further reduce the drag by an additional 25.7%. These findings underscore the efficacy of riblet geometries in different flow conditions, highlighting their potential in optimizing the acoustic and hydrodynamic performance of maritime systems.

0106流体工学
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