A hybrid acoustic structure for low-frequency and broadband underwater sound absorption

Jia, Xinyu; Jin, Guoyong; Shi, Kangkang; Chun-yang, BU; Ye, Tiangui

doi:10.1177/14613484221081846

Cited by 16 publications

(6 citation statements)

References 41 publications

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“…The reason was that the increased E′ enhanced the integral stiffness of the composite, leading to an increase in the resonance frequency [ 34 ]. Meanwhile, the increased E′ improved the peak intensity of the resonance absorption peaks, indicating that a relatively high E′ could bring about an improved sound absorption performance (especially at higher frequencies) [ 35 ]. For instance, the SAC of the first absorption peak in Figure 1 b increased from 0.81 (in the E4 curve) to 0.98 (in the E1 curve).…”

Section: Resultsmentioning

confidence: 99%

Finite Element Solution for Dynamic Mechanical Parameter Influence on Underwater Sound Absorption of Polyurethane-Based Composite

Yin

Liu

Wang

et al. 2022

IJMS

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Underwater noise pollution, mainly emitted by shipping and ocean infrastructure development of human activities, has produced severe environmental impacts on marine species and seabed habitats. In recent years, a polyurethane-based (PU-based) composite with excellent damping performance has been increasingly utilized as underwater sound absorption material by attaching it to equipment surfaces. As one of the key parameters of damping materials, dynamic mechanical parameters are of vital importance to evaluating the viscoelastic damping property and thus influencing the sound absorption performance. Nevertheless, lots of researchers have not checked thoroughly the relationship and the mechanism of the material dynamic mechanical parameters and its sound absorption performance. In this work, a finite element model was fabricated and verified effectively using acoustic pulse tube tests to investigate the aforementioned issues. The influence of the dynamic mechanical parameters on underwater sound absorption performance was systematically studied with the frequency domain to reveal the mechanism and the relationship between damping properties and the sound absorption of the PU-based composite. The results indicate that the internal friction of the molecular segments and the structure stiffness were the two main contributors of the PU-based composite’s consumption of sound energy, and the sound absorption peak and the sound absorption coefficient could be clearly changed by adjusting the dynamic mechanical parameters of the composite. This study will provide helpful guidance to develop the fabrication and engineering applications of the PU-based composite with outstanding underwater sound absorption performance.

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Section: Resultsmentioning

confidence: 99%

Finite Element Solution for Dynamic Mechanical Parameter Influence on Underwater Sound Absorption of Polyurethane-Based Composite

Yin

Liu

Wang

et al. 2022

IJMS

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“…(A) Sound absorption coating structure with a micro‐perforated plate; 59 (B) sound absorption coefficient with the micro‐perforated plate structure; 59 (C) General view of underwater anechoic coating; 60 (D) local resonator structure embedded with a functionally graded material 60 …”

Section: Traditional Structurementioning

confidence: 99%

“…For the low‐frequency numerical case, not only the final material distribution with high absorption performance was given, but also the sensitivity information of the reflection coefficient under a given incident wave was compared. Jia et al 60 proposed a structure of embedding local resonators in functionally graded materials, which can improve and obtain broadband sound absorption performance at low frequencies, as shown in Figure 4C,D. Feng et al 83 proposed composite structures with different gradient impedances.…”

Section: Traditional Structurementioning

confidence: 99%

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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“…In order to realize effective sound absorption of finite thickness materials, two MPMF N structures were combined into a gradient structure to further absorb low and medium frequency noise. 39 Based on the modified model and the transfer function of each layer, the particle swarm optimization (PSO) algorithm was used to optimize the structural parameters to further improve the sound absorption of the composite. 40 The PSO algorithm seeks the best results by iterating the random results.…”

Section: Performance Optimization Of the Multi-layer Gradient Fiber-b...mentioning

confidence: 99%

Fabrication, sound absorption simulation and performance optimization of multi‐layer gradient fiber‐based composites

Chen

Zhu

et al. 2023

Polymer Composites

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Noise reduction with materials of finite thickness has been a hot research topic. In this study, multi‐layer gradient fiber‐based composites integrating porous, resonant and damping structures were prepared for efficient sound absorption. Here, the effects of composite structure, fiber‐based thickness and micro‐perforated membrane fabric (MPMF) structure on the sound absorption of the composites were investigated. From the results, the sound absorption band of the composite can be effectively tuned by adjusting the structure of the MPMF or the thickness of the fiber‐based. In addition, the established acoustic model can accurately predict the sound absorption performance of the structure. It is worth mentioning that the gradient structure optimized by the algorithm exhibits broadband sound absorption (noise reduction coefficient of 0.42) and thin feature (thickness of 0.9 cm). Moreover, the medium and low frequency sound waves can be propagated and absorbed more easily by optimizing the structure of the composite. This work provides a reference for the preparation of multi‐layer gradient sound‐absorbing structures and the design of acoustic products in a specific frequency range.

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A hybrid acoustic structure for low-frequency and broadband underwater sound absorption

Cited by 16 publications

References 41 publications

Finite Element Solution for Dynamic Mechanical Parameter Influence on Underwater Sound Absorption of Polyurethane-Based Composite

Finite Element Solution for Dynamic Mechanical Parameter Influence on Underwater Sound Absorption of Polyurethane-Based Composite

Recent study progress of underwater sound absorption coating

Fabrication, sound absorption simulation and performance optimization of multi‐layer gradient fiber‐based composites

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