具有预应变波传播特性的梯度半可重入零泊松比超材料组成的水下圆柱形夹层元结构

IF 13 1区工程技术 Q1 ENGINEERING, MARINE

Journal of Ocean Engineering and Science Pub Date : 2023-03-03 DOI:10.1016/j.joes.2023.02.002

Qing Li , Zeping Wang , Xiang Mao , Deqing Yang

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引用次数: 0

摘要

零泊松比（ZPR）机械超材料在单向压缩时不会产生横向位移，因此探索了由半重入（SRE）ZPR 超材料组成的圆柱形夹层超结构在水下设备或潜水器结构的圆柱形外壳上的应用。根据周期边界条件（PBC）和布洛赫定理，优化设计了一组具有特定预约束波传播特性和足够承载能力的 ZPR 单元。然后研究了由均质和分级 SRE ZPR 单元组成的圆柱形夹层元结构的传声和抗压性能。结果表明，所设计的元结构能在与预应变带隙相对应的指定频率区域内完美地产生更好的振动声衰减性能，并能以较低的重量体积比安全地承受相当于 1000 米深度的静水压力。此外，功能分级超材料内核还能在更宽的频率范围内提高振声性能。

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Underwater cylindrical sandwich meta-structures composed of graded semi re-entrant zero Poisson's ratio metamaterials with pre-strained wave propagation properties

Zero Poisson's ratio (ZPR) mechanical metamaterials can yield no transverse displacements when unidirectionally compressed, and cylindrical sandwich meta-structures composed of semi re-entrant (SRE) ZPR metamaterials are thus explored for applications on cylindrical shells of underwater equipment or submersible structures. A group of ZPR unit cells with specified pre-strained wave propagation characteristics and adequate load-bearing capabilities is optimally designed based on the periodic boundary condition (PBC) and Bloch's Theorem. The sound transmission and pressure-resistant performance of cylindrical sandwich meta-structures comprising the homogeneous and graded SRE ZPR unit cells are then investigated. The results show that the designed meta-structures can perfectly yield better vibroacoustic attenuation behavior within the specified frequency regions corresponding to the pre-strained band gaps and safely bear the hydrostatic pressure equivalent to 1000 m depth with low weight-bulk ratios. In addition, the functionally graded metamaterial core can boost vibroacoustic performance within broader frequency ranges.

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来源期刊

Journal of Ocean Engineering and Science Multiple-

CiteScore

11.50

自引率

19.70%

发文量

224

审稿时长

29 days

期刊介绍： The Journal of Ocean Engineering and Science (JOES) serves as a platform for disseminating original research and advancements in the realm of ocean engineering and science. JOES encourages the submission of papers covering various aspects of ocean engineering and science.