Phenomenological law for the acoustic reflection by an array of cylindrical cavities in a soft elastic medium

Thieury, Margaux; Leroy, Valentin; Dassé, J; Tourin, Arnaud

doi:10.1063/5.0020941

Cited by 7 publications

(2 citation statements)

References 22 publications

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“…Up till now, only a few finite element methods (FEMs) have been performed to study the effect of various hydrostatic pressures like commercial FEM software ANSYS and COMSOL. 24,28,29 Through ANSYS simulating insulation coating with cylindrical cavities, it is found that the average thickness of the layer gets reduced, and the average diameter of the hole also gets smaller. 30 More systematic studies about the numerical modeling for underwater sound absorption at various hydrostatic pressures are required.…”

Section: Introductionmentioning

confidence: 99%

Numerical design and optimization of metamaterials for underwater sound absorption at various hydrostatic pressures

Wang

Cao

2023

Journal of Low Frequency Noise, Vibration and Active Control

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Underwater sound absorption materials with a stable performance at various hydrostatic pressures are important for marine applications. However, most studies about underwater sound absorption materials only focused on the performance at atmospheric hydrostatic pressure, while ignoring the influence of various hydrostatic pressures. Aiming to improve the underwater sound absorption stability of a metamaterial at various hydrostatic pressures, different structures and a Nelder–Mead algorithm with an acoustic-structure fully coupled finite element method (FEM) model are developed to optimize the structure of the metamaterial at various hydrostatic pressures. In this numerical modeling, the metamaterial is a PDMS matrix embedded with periodic cylinders. Firstly, the effect of hydrostatic pressure on the metamaterial is evaluated in the frequency range [0, 8 kHz]. Secondly, different cases are designed to improve the underwater sound absorption stability at various hydrostatic pressures, including different cylinder radii, different distances between the air cylinder and the steel backing, and different void shapes. Then two layers of air and/or steel cylinders are introduced to further improve sound absorption performance under various hydrostatic pressures. The results indicate that PDMS with two layers of air cylinders have the optimal sound absorption stability performance under various hydrostatic pressures, which can be attributed to the top layer of air cylinders absorbing the main deformation. Lastly, the optimization algorithm significantly improves the sound absorption performance of the metamaterials at various hydrostatic pressures. This combination of an optimistic algorithm and FEM can guide the design of underwater sound absorption metamaterials at various hydrostatic pressures.

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Section: Introductionmentioning

confidence: 99%

Numerical design and optimization of metamaterials for underwater sound absorption at various hydrostatic pressures

Wang

Cao

2023

Journal of Low Frequency Noise, Vibration and Active Control

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“…For airborne sound, the constraints of the causality principle dictate that the thickness of the sample must satisfy the following relationship [22] : 1 where is the bulk modulus of air, is the effective bulk modulus of the sample and represents the absorption spectrum with respect to the wavelength . Numerous researchers have attempted to achieve subwavelength acoustic structure design within the con nes of the minimum thickness limit [23][24][25][26][27][28][29][30][31][32][33][34] . Recently, Mak et al [35] used a soft boundary to circumvent the minimum thickness…”

Section: Introductionmentioning

confidence: 99%

Deep Subwavelength Broadband Sound Absorption by a Buckled Plate Resonator

Han

Xing

2023

Preprint

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The absorption performance and the sample thickness need to satisfy the causal relation, and the sound absorption bandwidth of a thin layer structure is often very narrow to achieve high sound absorption at low frequency. In this paper, a buckled plate resonator is proposed to achieve the low frequency broadband sound absorption in the deep subwavelength range. The resonator consists of an air-tight back cavity sealed by an elastic circular thin plate. A uniform in-plane compressive force is applied on the thin plate to make the plate buckling produce negative stiffness, and the resonator operates in the pre-buckling state. By adjusting the structural stiffness, the buckled plate resonator achieves the purpose of adjusting Beff and B0, which weakens the causal principle requirement of minimum acoustic structure thickness and realizes broadband low-frequency sound absorption. The final experimental results show that one 3mm(λ/220) back cavity, 0.89 sound absorption is achieved at 515Hz, and the corresponding relative sound absorption bandwidth is 19.4%. From the causal relation, the calculated minimum sample thickness is 6.7mm for the observed absorption spectrum. Compared with traditional plate-type acoustic metamaterials, which achieve low-frequency sound absorption by increasing the mass, the absorption bandwidth is too narrow due to the influence of the quality factor Qm, our work provides a design paradigm for the low frequency broadband acoustic absorbers.

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Theory and numerical method for the effects of hydrostatic pressure on sound absorption of underwater acoustic coatings with air cavities

Hai-bin

Zhao

Wen

2022

Journal of Sound and Vibration

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Phenomenological law for the acoustic reflection by an array of cylindrical cavities in a soft elastic medium

Cited by 7 publications

References 22 publications

Numerical design and optimization of metamaterials for underwater sound absorption at various hydrostatic pressures

Numerical design and optimization of metamaterials for underwater sound absorption at various hydrostatic pressures

Deep Subwavelength Broadband Sound Absorption by a Buckled Plate Resonator

Theory and numerical method for the effects of hydrostatic pressure on sound absorption of underwater acoustic coatings with air cavities

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