2D phononic-crystal Luneburg lens for all-angle underwater sound localization

IF 1 3区物理与天体物理 Q4 ACOUSTICS

Acta Acustica Pub Date : 2022-01-01 DOI:10.1051/aacus/2021058

Yongdu Ruan, Xu Liang

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引用次数: 6

Abstract

Phononic crystals are well known for acoustic wave manipulation which may have potential application in an underwater acoustic detection system. In this work, we design and simulate a two-dimensional Luneburg lens based on gradient-index (GRIN) phononic crystal that is composed of PLA-Air inclusion, and a novel application of GRIN phononic crystals is proposed to sound localization. The Luneburg lens has a broadband working range, from 1500 Hz to 7500 Hz, for acoustic wave focusing with sensitive directivity and signal-to-noise improvement. By searching maximum wave intensity’s position of the focusing beam, the propagating direction of an unknown sound wave can be directly recognized covering 360°. Besides, we redesign the conventional square-lattice Luneburg lenses using annular lattices for better performance. The annular-lattice Luneburg lens overcomes the weakness of configuration defect due to the square lattice. The numerical results show that the redesign Luneburg lenses have high accuracy for distance measurement from 5 m to 35 m through the triangulation location. In a word, this work tries to explore a novel application of phononic crystals in underwater acoustic positioning and navigation technology.

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二维声子晶体Luneburg透镜全角度水声定位

声子晶体以声波操纵而闻名，在水声探测系统中具有潜在的应用前景。在这项工作中，我们设计并模拟了一个基于PLA-Air内含物组成的梯度指数(GRIN)声子晶体的二维Luneburg透镜，并提出了GRIN声子晶体在声音定位中的新应用。Luneburg透镜具有宽带工作范围，从1500 Hz到7500 Hz，用于声波聚焦，具有灵敏的指向性和信噪比改善。通过搜索聚焦光束的最大波强位置，可以直接识别360°范围内未知声波的传播方向。此外，我们利用环形晶格重新设计了传统的方形晶格吕尼堡透镜，以获得更好的性能。环形晶格Luneburg透镜克服了方形晶格造成的构型缺陷。数值结果表明，重新设计的Luneburg透镜通过三角定位在5 ~ 35 m范围内具有较高的测量精度。总之，本研究试图探索声子晶体在水声定位与导航技术中的新应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Acustica ACOUSTICS-

CiteScore

2.80

自引率

21.40%

发文量

审稿时长

12 weeks

期刊介绍： Acta Acustica, the Journal of the European Acoustics Association (EAA). After the publication of its Journal Acta Acustica from 1993 to 1995, the EAA published Acta Acustica united with Acustica from 1996 to 2019. From 2020, the EAA decided to publish a journal in full Open Access. See Article Processing charges. Acta Acustica reports on original scientific research in acoustics and on engineering applications. The journal considers review papers, scientific papers, technical and applied papers, short communications, letters to the editor. From time to time, special issues and review articles are also published. For book reviews or doctoral thesis abstracts, please contact the Editor in Chief.