A review of underwater acoustic metamaterials

Zhang, Yanni; Chen, Kean; Hao, Xiaying; Cheng, Ying

doi:10.1360/tb-2019-0690

Cited by 21 publications

(12 citation statements)

References 35 publications

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“…The straight dashed black line is the energy band of water which indicates that the traveling waves don't have any dispersion during propagation. There are many references [34,35] and websites 1,2 where readers can download the examples, available to calculate the band structure based on the Bloch-Floquet theory, so the detailed process of calculation is not given in this paper.…”

Section: Luneburg Lens Based On Phononic Crystalsmentioning

confidence: 99%

“…Recently, underwater acoustic metamaterial [1][2][3][4][5] attracts a lot of attention because its function of wave manipulation has potential applications in underwater technology, and a new crossing field may come out. As an initial version of acoustic metamaterial, the phononic crystal that is a periodic structure made of multiple mediums or a single-phase artificial microstructure enables negative refraction [6], wave bending [7], and splitting [8] to be realized.…”

Section: Introductionmentioning

confidence: 99%

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

Ruan

Liang

2022

Acta Acust.

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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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Section: Luneburg Lens Based On Phononic Crystalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Ruan

Liang

2022

Acta Acust.

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“…One reason for this state of affairs is the difficulty of experimental measurements, owing to the large wavelength involved and the required large impedance mismatch of the solid material for a water impedance tube (11,12). As a result, considerable studies on underwater absorption are only limited to theoretical analyses and numerical calculations (13)(14)(15)(16)(17)(18)(19)(20)(21)(22), whose idealized assumptions may not hold in practical scenarios, while almost all the existing experimental works (23)(24)(25)(26)(27)(28)(29)(30), measured in the water impedance tube, are based on small samples, which may not reflect the true performance in complex environments (31). There is simply a lack of research works based on large-scale samples, measured in water pools.…”

Section: Introductionmentioning

confidence: 99%

Underwater metamaterial absorber with impedance-matched composite

Gao

Tinel

et al. 2022

Sci. Adv.

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By using a structured tungsten-polyurethane composite that is impedance matched to water while simultaneously having a much slower longitudinal sound speed, we have theoretically designed and experimentally realized an underwater acoustic absorber exhibiting high absorption from 4 to 20 kHz, measured in a 5.6 m by 3.6 m water pool with the time-domain approach. The broadband functionality is achieved by optimally engineering the distribution of the Fabry-Perot resonances, based on an integration scheme, to attain impedance matching over a broad frequency range. The average thickness of the integrated absorber, 8.9 mm, is in the deep subwavelength regime (~λ/42 at 4 kHz) and close to the causal minimum thickness of 8.2 mm that is evaluated from the simulated absorption spectrum. The structured composite represents a new type of acoustic metamaterials that has high acoustic energy density and promises broad underwater applications.

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“…At present, human knowledge of the ocean is far less than that of the land. With the rapid development of underwater acoustic equipment (UAE) and underwater detection technology, higher requirements are put forward for acoustic performance of underwater target detection equipment, sea area information collection equipment and underwater military equipment (UME) [3]. Therefore, the application of underwater acoustic metamaterials is the key to improve the performance index of UAE.…”

Section: Introductionmentioning

confidence: 99%

A review of underwater acoustic metamaterials for underwater acoustic equipment

Zhu

Wu³

et al. 2022

Front. Phys.

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Researchers use underwater acoustic equipment to explore the unknown ocean environment, which is one of the important means to understand and utilize the ocean. For underwater acoustic equipment, the application of underwater acoustic metamaterials is the premise to ensure and improve the performance of underwater acoustic communication, acoustic stealth, and sonar detection. Due to the limitations of mass density law and high hydrostatic pressure, traditional underwater acoustic materials cannot effectively absorb low-frequency sound waves and have low efficiency of elastic energy conversion. The sound absorption effect is poor under low frequency and high hydrostatic pressure. In recent years, with the development of acoustic metamaterials technology, all kinds of underwater acoustic metamaterials have also been proposed. Compared with sound waves propagating in the air, underwater sound is more difficult to control than air sound with the same frequency, so the design of underwater acoustic metamaterials is more complicated. This paper reviews the basic characteristics, development history of sound absorption, sound insulation decoupling, and underwater acoustic guided metamaterials, then the existing problems and the future development direction of underwater acoustic metamaterials are discussed.

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A review of underwater acoustic metamaterials

Cited by 21 publications

References 35 publications

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

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

Underwater metamaterial absorber with impedance-matched composite

A review of underwater acoustic metamaterials for underwater acoustic equipment

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