A review of underwater acoustic metamaterials for underwater acoustic equipment

Zhu, Zhenjing; Hu, Ning; Wu, Junyi; Li, Wenxin; Zhao, Jiabao; Wang, Maofa; Zeng, Fanzong; Dai, Huajie; Zheng, Yongju

doi:10.3389/fphy.2022.1068833

Cited by 11 publications

(4 citation statements)

References 49 publications

(30 reference statements)

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“…The development process of soundabsorbing structures from porous materials to acoustic metamaterials was summarized by Yang and Sheng (2017). Zhu et al (2022) summarized the application directions of underwater acoustic metamaterials, systematically described the current application hotspots, and provided prospects for their future development. A review of the development history of acoustic metamaterials and phononic crystals in recent decades and the introduction of some representative studies, including the calculation of acoustic parameters and the design methods of acoustic metamaterials, were performed by Liu et al (2020).…”

Section: Article Highlightsmentioning

confidence: 99%

Review of Underwater Anechoic Coating Technology Under Hydrostatic Pressure

Jia,

Jin,

2024

J. Marine. Sci. Appl.

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The underwater anechoic coating technology, which considers pressure resistance and low-frequency broadband sound absorption, has become a research hotspot in underwater acoustics and has received wide attention to address the increasingly advanced low-frequency sonar detection technology and adapt to the working environment of underwater vehicles in deep submergence. One the one hand, controlling low-frequency sound waves in water is more challenging than in air. On the other hand, in addition to initiating structural deformation, hydrostatic pressure also changes material parameters, both of which have a major effect on the sound absorption performance of the anechoic coating. Therefore, resolving the pressure resistance and acoustic performance of underwater acoustic coatings is difficult. Particularly, a bottleneck problem that must be addressed in this field is the acoustic structure design with low-frequency broadband sound absorption under high hydrostatic pressure. Based on the influence of hydrostatic pressure on underwater anechoic coatings, the research status of underwater acoustic structures under hydrostatic pressure from the aspects of sound absorption mechanisms, analysis methods, and structural designs is reviewed in this paper. Finally, the challenges and research trends encountered by underwater anechoic coating technology under hydrostatic pressure are summarized, providing a reference for the design and research of low-frequency broadband anechoic coating.

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Section: Article Highlightsmentioning

confidence: 99%

Review of Underwater Anechoic Coating Technology Under Hydrostatic Pressure

Jia,

Jin,

2024

J. Marine. Sci. Appl.

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“…The material parameters of the two media are brought into the transfer matrix of the specific model. The transmission coefficient can be derived from T 11 , T 12 , T 21 , and T 22 , as exhibited in Equation (12), which corresponds to the wholesome meta-structure properties of the PSPC. In this research work, the corresponding parameters are…”

Section: Transfer Matrix Model Of Phononic Lattice Meta-structurementioning

confidence: 99%

“…Zhu et al reviewed the basic characteristics and development history of sound absorption, sound insulation, and decoupling. Using underwater acoustic equipment to explore the unknown marine environment is one of the important means to understand and utilize the ocean [ 12 ]. Since underwater acoustic equipment is often used in various marine environments, it will inevitably produce some subtle irregular vibrations, and the authors believe that the application of underwater acoustic metamaterials is key to improving the engineering performance indicators, mainly including underwater acoustic detection and acoustic stealth [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Meta-Structure Hull Design with Periodic Layered Phononic Crystals Theory for Wide-Band Low-Frequency Sound Insolation

Zhang

Tao

et al. 2023

Materials

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The hulls of marine vehicles are generally very effective at attenuating airborne acoustic noise generated by their powertrains. However, conventional hull designs are generally not very effective at attenuating wide-band low-frequency noise. Meta-structure concepts offer an opportunity for the design of laminated hull structures tailored to address this concern. This research proposes a novel meta-structure laminar hull concept using periodic layered Phononic crystals to optimize the sound insolation performance on the air–solid side of the hull structure. The acoustic transmission performance is evaluated using the transfer matrix, the acoustic transmittance, and the tunneling frequencies. The theoretical and numerical models for a proposed thin solid-air sandwiched meta-structure hull indicate ultra-low transmission within a 50-to-800 Hz frequency band and with two predicted sharp tunneling peaks. The corresponding 3D-printed sample experimentally validates the tunneling peaks at 189 Hz and 538 Hz, with 0.38 and 0.56 transmission magnitudes, respectively, with the frequency band between those values showing wide-band mitigation. The simplicity of this meta-structure design provides a convenient way to achieve acoustic band filtering of low frequencies for marine engineering equipment and, accordingly, an effective technique for low-frequency acoustic mitigation.

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“…Over the past few decades, the study of electromagnetic wave (EMW) propagation in layered media has attracted considerable attention [1][2][3], particularly in the context of EMW propagation across the sea-air interface. In comparison to techniques employed in acoustics [4,5] and optics [6,7], as well as other fields of ocean engineering, EMWs exhibit unique and valuable properties that render them a prime choice for applications in ocean communication engineering. Despite their limited transmission range owing to high attenuation, EMWs possess several advantageous features.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Electromagnetic Fields of Extremely Low-Frequency Horizontal Electric Dipoles at Sea–Air Boundaries

Hu,

Xie,

2023

Electronics

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The technologies of undersea detection and communication, seabed sensor networks, and geophysical detection using electromagnetic waves have emerged as research focal points within the field of marine science and engineering. However, most studies have focused on the propagation of electromagnetic fields over long distances within the shallow “sea-seabed” environment. This paper introduces a quasi-static approximation method to address the Sommerfeld numerical integration challenge within the near-field region, employing the horizontal electric dipole (HED) as a model. It derives the Sommerfeld numerical integral expressions under conditions where the wave-number ratio at the “seawater-air” boundary does not adhere to the requirement of |k0/k1| << 1 (where subscripts 0 and 1 denote seawater and air media, respectively). Building upon this, the paper simplifies the Bessel-Fourier infinite integral term within the integral expression to obtain Sommerfeld numerical integral approximations for the propagation of electromagnetic fields in the near region of extremely low frequency (ELF) within seawater. The study further conducts simulations and calculations to determine amplitude variations in electromagnetic field intensity generated by an ELF HED at different frequencies, dipole heights, and observation point depths. It concludes with an analysis of electromagnetic field propagation characteristics at the seawater-air boundary. Experimental findings highlight the lateral wave as the primary mode of electromagnetic wave propagation at this interface.

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A review of underwater acoustic metamaterials for underwater acoustic equipment

Cited by 11 publications

References 49 publications

Review of Underwater Anechoic Coating Technology Under Hydrostatic Pressure

Review of Underwater Anechoic Coating Technology Under Hydrostatic Pressure

Meta-Structure Hull Design with Periodic Layered Phononic Crystals Theory for Wide-Band Low-Frequency Sound Insolation

Evaluation of Electromagnetic Fields of Extremely Low-Frequency Horizontal Electric Dipoles at Sea–Air Boundaries

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