A novel semi-analytical approach for predicting the sound absorptions of a new underwater composite coating with transversely arranged SWCNTs

Zhang, Zhifu; Li, Zhuang; Li, Tianyun; Huang, Qibai

doi:10.1016/j.compstruct.2021.114335

Cited by 10 publications

(4 citation statements)

References 32 publications

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“…Inspired by this mechanism and introducing the viscoelasticity of the substrate, strong low-frequency waterborne absorption is realized by Wen et al with a sub-wavelength sample [ 4 ], but the inferiority of this is that the effective frequency bandwidth is very narrow. A lot of studies have been conducted to expand the effective frequency bandwidth by introducing multi-resonators [ 5 , 6 , 7 , 8 , 9 ], metal spiral and inter-connecting structures [ 10 , 11 , 12 ], air cavities and combinations of them [ 13 , 14 , 15 , 16 , 17 ]. For example, Wang et al proposed a broadband waterborne absorbing metamaterial with gradient cavity array strengthened by a carbon fiber framework [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Wang et al proposed a broadband waterborne absorbing metamaterial with gradient cavity array strengthened by a carbon fiber framework [ 15 ]. Zhang et al proposed a waterborne stealth metastructure with a transverse arrangement of carbon nanotubes to broaden the effective absorption range [ 16 ]. Fan et al also proposed an acoustic absorption–bearing metamaterial consisting of four different subunits and the absorption bandwidth increased by 600% [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Broadband Waterborne Multiphase Pentamode Metastructure with Simultaneous Wavefront Manipulation and Energy Absorption Capabilities

Zou

Zhao

2023

Materials

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Acoustic metastructures are artificial structures which can manipulate the wavefront in sub-wavelength dimensions, and previously proposed acoustic metastructures have been mostly realized with single materials. An acoustic metastructure with composite structure is proposed for underwater acoustic stealth considering both wavefront manipulation and sound absorption. The unit cells of the metastructure are composed of a metallic supporting lattice, interconnecting polymer materials and mass balancing columns. With the gradual modulations of equivalent physical properties along the horizontal direction of metastructure, the incident acoustic wave is reflected to other directions. Meanwhile, the polymer material inside the unit cells will dissipate the acoustic wave energy due to inherent damping properties. With the simultaneous modulations of reflected wave direction and scattering acoustic amplitude, significant improvement of the underwater stealth effect is achieved. Compared with single-phase metastructure, the Far-Field Sound Pressure Level (FFSPL) of multiphase metastructure decreases by 4.82 dB within the frequency range of 3 kHz~30 kHz. The linearized mean stress for multiphase metastructure is only 1/3 of that of single-phase metastructure due to it having much thicker struts and much more uniform stress distribution under the same hydrostatic pressure. The proposed composite structure possesses potential applications due to its acceptable thickness (80 mm) and low equivalent density (1100 kg/m3).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Broadband Waterborne Multiphase Pentamode Metastructure with Simultaneous Wavefront Manipulation and Energy Absorption Capabilities

Zou

Zhao

2023

Materials

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“…Li et al [29] introduced a micro-perforated plate into an underwater anechoic coating with rigid backing, while the developed a corresponding TMM (4 × 4) based on Maa's equation and wave propagation theory in layered media to analyze the broadband sound absorption in plane wave oblique incidence conditions. Zhang et al [30] presented a new underwater composite covering with transversely arranged single-walled carbon nanotubes, and then developed a novel semi-analytical approach integrating molecular dynamics simulation methodology and global generalized TMM (6 × 6) to forecast the cross-scale mechanical properties and sound absorption characteristics with zero-transmission conditions.…”

Section: Introductionmentioning

confidence: 99%

Global Sound Absorption Prediction for a Composite Coating Laid on an Underwater Submersible in Debonding States

Zhang,

Huang,

Wang

et al. 2023

JMSE

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To address the problem that anechoic coatings frequently fall off from modern submersible hulls and are detrimental to the realization of underwater acoustic stealth, this paper focuses on the broadband sound absorbing of acoustic coverings in debonding states from fully bonded span to fully shedded conditions. Based on the non-uniform waveguide theory, subdomain splitting approach, and wave propagation theory in layered media, a global transfer matrix method (TMM) is developed for predicting the sound absorption of a composite overburden with periodic cavities in all peeling situations. Meanwhile, the corresponding acoustic-structure fully coupled finite element (FE) simulation and hydroacoustic impedance tube-based absorption experiment are sequentially performed for the lining in a semi-bonded state to comprehensively verify the accuracy and reliability of the present analytical methodology. Then, the influence laws of debonding states, material properties, and geometric parameters on the global absorption performance are investigated in depth to reveal the multiple energy dissipation mechanisms. The results show that the shedding state primarily affects the sound absorption characteristics of anechoic coatings in the low- to mid-frequency band below 7 kHz.

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“…Inspired by this mechanism and introducing viscoelasticity of substrate, low frequency waterborne strong absorption is realized by Wen et al with a sub-wavelength sample [4], but the inferiority is that the effective frequency bandwidth is very narrow. A lot of studies have been done to expand the effective frequency bandwidth by introducing multi-resonators [5][6][7][8][9], metal spiral and inter-connecting structures [10][11][12], air cavities and combinations of them [13][14][15][16][17]. For example, combining two absorption mechanisms of cavity resonance and impedance transition loss, 3 polymer (E≈1GPa) whose damping coefficient is very small is adopted and the damping of the substrates and structures is ignored.…”

Section: Introductionmentioning

confidence: 99%

Broadband Waterborne Multiphase Metasurface with Simultaneous Wavefront Manipulation and Energy Absorption

An¹,

Han²,

Zhao³

2023

Preprint

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Acoustic metasurface are artificial structures which could manipulate the wavefront in sub-wavelength dimensions and the previous proposed acoustic metasurface were mostly realized with single materials. An acoustic metasurface with composite structure is proposed for underwater acoustic stealth considering both wavefront manipulation and sound absorption. The unit cells of the metasurface are composed by metallic supporting lattice, interconnecting polymer materials and mass balancing columns. With the gradual modulations of equivalent physical properties along the horizontal direction of metasurface, the incident acoustic wave is reflected to other directions. Meanwhile, the polymer material inside the unit cells would dissipate the acoustic wave energy due to inherent damping properties. With the simultaneous modulations of reflected wave direction and scattering acoustic amplitude, significant improvement of underwater stealth effect is achieved. Compared with single-phase metasurface, the Far-Field Sound Pressure Level (FFSPL) of the multiphase metasurface decreased by 4.82 dB within the frequency range of 3kHz~30kHz. Under a hydrostatic pressure of 5MPa, the linearized mean stress for multiphase metasurface is only 1/3 of that of single-phase metasurface due to much thicker struts and much more uniform stress distribution. The proposed composite structure possesses potential applications due to acceptable thickness (80mm) and low equivalent density (1100 kg/m3).

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A novel semi-analytical approach for predicting the sound absorptions of a new underwater composite coating with transversely arranged SWCNTs

Cited by 10 publications

References 32 publications

Broadband Waterborne Multiphase Pentamode Metastructure with Simultaneous Wavefront Manipulation and Energy Absorption Capabilities

Broadband Waterborne Multiphase Pentamode Metastructure with Simultaneous Wavefront Manipulation and Energy Absorption Capabilities

Global Sound Absorption Prediction for a Composite Coating Laid on an Underwater Submersible in Debonding States

Broadband Waterborne Multiphase Metasurface with Simultaneous Wavefront Manipulation and Energy Absorption

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