Underwater Low-Frequency Sound Absorbing Metamaterials Based on Wave-Mode Transformation and Local Resonance Mechanism

Zhang, Han; Hao, Pengxiang; Gao, Yang; Cheng, Yudong; Li, Guangzeng; Hu, Ning; Qi, Zhengpan

doi:10.12693/aphyspola.140.455

Cited by 7 publications

(6 citation statements)

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“…This was because when the backing increased from zero, at an appropriate thickness, resonance and structure coupling resonance of the backing increased, making the backing thickness further increase from the appropriate thickness, and the contribution of the resonance and structure coupling co‐vibration of the backing to the overall capacity decreased. Zhang et al 31 designed an underwater sound‐absorption acoustic metamaterial based on viscoelastic rubber, which included five groups of conical and cylindrical cavities, two metal vibrators, and a rigid backing. It should be noted that the average sound absorption coefficient of this structure could be more than 0.7 in the range of 42–300 Hz, and the sound absorption coefficient of the sound absorption bandwidth could be more than 0.9 in the range of 110–300 Hz.…”

Section: Underwater Acoustic Metamaterialsmentioning

confidence: 99%

“…The phononic crystal is a composite material of local resonant structural units, which can show effective negative elastic constants in a certain frequency range and generate a low‐frequency elastic‐wave band gap. Since then, much exploration work on the acoustic metamaterial application in the fields of vibration reduction and noise reduction has been done, mainly considering the air acoustic metamaterials 3‐17 and underwater acoustic metamaterials 18‐41 . However, this study describes only the local and nonlocal resonance underwater acoustic absorption metamaterials, considering the sound absorption coating of metamaterials.…”

Section: Introductionmentioning

confidence: 99%

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Recent study progress of underwater sound absorption coating

Zhang

Zhao

Gao

2023

Engineering Reports

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Based on the recent development of underwater sound absorption coatings, this paper analyzes the evolution of underwater sound absorption coatings from two aspects: traditional structures and metamaterials. The traditional structures are divided into three types: cavity structures, composite structures, and impedance‐matching structures. First, the development history of traditional structures, from cavities to hybrid structures, is presented, and the optimization and recent improvements in sound absorption fundamentals are explained. For different types of structures, the sound absorption effects of their respective structures are presented. At the same time, recent development progress of underwater coating metamaterials is summarized, and the sound absorption fundamentals and effects of local and nonlocal resonance types are compared. In addition, typical underwater sound absorption metamaterials are described in detail, and the application prospect of the acoustic bubble structure in practice is summarized. Moreover, this paper compares and discusses various structural types of underwater sound absorption coatings and points out the shortcomings of recent related research. Finally, it points out current open issues in the field and suggests future development directions of underwater sound absorption coatings, defining the possible development focus of underwater sound absorption coatings.

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Section: Underwater Acoustic Metamaterialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent study progress of underwater sound absorption coating

Zhang

Zhao

Gao

2023

Engineering Reports

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“…5(a). For practical applications always requiring high-efficient conversions, such as the anechoic tile of a submarine, 31) we can mass-produce one type of EMP and attach it on different solid backgrounds.…”

Section: Se Pementioning

confidence: 99%

“…30) The conversion between P and S waves [16][17][18] is interesting and also important for practical applications. 31) The traditional methods of achieving elastic mode conversion are mainly based on the scattering of elastic waves on various shapes of scatterers. But the reliance on scattering would make the conversion unfeasible at low frequencies because of the long elastic wavelengths.…”

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confidence: 99%

Total conversion between the longitudinal and transverse waves by ultrathin elastic metamaterials with anisotropic resonances

Wang

Chang

et al. 2022

Appl. Phys. Express

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In this work, total conversions between longitudinal and transverse modes are achieved within an elastic metamaterial plate with thickness two orders smaller than the wavelength. The ultrathin metamaterial plate consists of an array of anisotropic dipolar resonators obliquely oriented, which can transfer the longitudinal movement into the transverse one, or vice versa, accounting for this effect. A mass-spring model is developed to depict analytically the mode conversion with a quantitative agreement with the simulation. The conversion rate of the metamaterial plate remains above 95% in varying solids, showing good adaptability in practical applications.

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“…Converting L waves into T waves (L-to-T) will increase the overall absorbing coefficient of the submarine tile. 19) In classical theory, a part of elastic waves can be converted into another mode after scattering 20) or reflecting by an incline. 21) Very recently, total conversions are achieved by elastic metamaterials.…”

mentioning

confidence: 99%

Total conversion between the longitudinal and transverse waves by an ultrathin elastic metamaterial plate with U-shaped slits

Guo

Liu

et al. 2022

Appl. Phys. Express

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In this work, we propose an elastic metamaterial plate made by an aluminum block tailored with a row of periodic pair of U-shaped slits. Total conversion between longitudinal and transverse modes can be achieved by the metamaterial plate. The conversion is induced by an oblique dipolar resonance, not relying on the Fabry-Pérot resonance or the design of effective parameters. The plate’s thickness can be orders smaller than the working wavelength, showing good potential in practical applications.

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Underwater Low-Frequency Sound Absorbing Metamaterials Based on Wave-Mode Transformation and Local Resonance Mechanism

Cited by 7 publications

References 0 publications

Recent study progress of underwater sound absorption coating

Recent study progress of underwater sound absorption coating

Total conversion between the longitudinal and transverse waves by ultrathin elastic metamaterials with anisotropic resonances

Total conversion between the longitudinal and transverse waves by an ultrathin elastic metamaterial plate with U-shaped slits

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