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Advanced Sound Absorption Materials and Applications
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Advanced Sound Absorption Materials and Applications

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Porous Materials".

Deadline for manuscript submissions: closed (20 December 2022) | Viewed by 12645

Special Issue Editor

Dr. Ruben Picó Vila

E-Mail Website
Guest Editor
1. Instituto de Investigación para la Gestión Integrada de Zonas Costeras, Universitat Politècnica de València, Carrer del Paranimf 1, 46730 Gandia, València, Spain
2. Universitat Politècnica de Valènciadisabled, Valencia, Spain
Interests: periodic media; metamaterials; sound absorption

Special Issue Information

Dear Colleagues,

Research on materials for sound absorption and noise mitigation has dramatically evolved in recent years. The discovery of new physical phenomena has provided new innovative solutions and technology for the development of advanced sound absorption materials. Many challenges for the engineering of acoustic materials for sound absorption have motivated this research, such as reducing the density and thickness of materials or developing new promising alternatives for both thermal insulation and acoustic absorption.

New materials like aerogels, bio-based composites, carbon nanotubes, metaporous materials, double-porosity materials, or materials made of natural fibers, among others, have received significant interest due to their mechanical, thermal, and acoustical performances. Prediction tools are very powerful for understanding and describing the acoustic characteristics of different media from the microstructure to demonstrate their acoustical macro-behavior. Acoustic artificial metamaterials with exotic effective parameters have advances in manipulating and absorbing sound waves, particularly in sound absorption. Perfect sound absorption and absorption at subwavelength thickness can be obtained by properly designing these materials. Science and engineering converge in this field of acoustics to discover, develop, and fabricate new advanced sound absorption materials for future promising applications.

Dr. Ruben Picó Vila
Guest Editor

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Keywords

  • sound absorption
  • acoustic materials
  • metamaterials
  • noise mitigation
  • subwavelength
  • porous media

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Published Papers (5 papers)

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Research

10 pages, 3051 KiB  
Article
All-Natural Moss-Based Microstructural Composites in Deformable Form for Use as Graffiti and Artificial-Porous-Material Replacement
by Bu-Gon Kim, Min-Ho Yoon, Jaehwan Kim and Jung-Hwan Oh
Materials 2022, 15(24), 9053; https://doi.org/10.3390/ma15249053 - 18 Dec 2022
Cited by 1 | Viewed by 1899
Abstract
Although artificial porous materials are useful for dissipating acoustic waves, they pose a major environmental threat as most are non-recyclable. Developing sustainable structural materials with the mechanical and energy-absorption properties required to replace artificial porous materials is currently a key challenge. Here, we [...] Read more.
Although artificial porous materials are useful for dissipating acoustic waves, they pose a major environmental threat as most are non-recyclable. Developing sustainable structural materials with the mechanical and energy-absorption properties required to replace artificial porous materials is currently a key challenge. Here, we report, for the first time, a novel microstructure using all-natural moss with a compressive strength of up to 2.35 GPa and a sound-absorption performance of up to 90%, depending on the additives, such as yogurt, starch, and beer. In addition, the moss-based microstructure was applied as graffiti to a three-dimensionally printed house model to demonstrate improved performance against the effects of sound. By incorporating energy-absorbing materials without harmful substances, the desired structure can be decorated with the graffiti method. This work could pave the way for attenuating sound-wave and impact noise by using graffiti work on structural composite materials. Full article
(This article belongs to the Special Issue Advanced Sound Absorption Materials and Applications)
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26 pages, 7484 KiB  
Article
Development of Adjustable Parallel Helmholtz Acoustic Metamaterial for Broad Low-Frequency Sound Absorption Band
by Xiaocui Yang, Fei Yang, Xinmin Shen, Enshuai Wang, Xiaonan Zhang, Cheng Shen and Wenqiang Peng
Materials 2022, 15(17), 5938; https://doi.org/10.3390/ma15175938 - 27 Aug 2022
Cited by 21 | Viewed by 2381
Abstract
For the common difficulties of noise control in a low frequency region, an adjustable parallel Helmholtz acoustic metamaterial (APH-AM) was developed to gain broad sound absorption band by introducing multiple resonant chambers to enlarge the absorption bandwidth and tuning length of rear cavity [...] Read more.
For the common difficulties of noise control in a low frequency region, an adjustable parallel Helmholtz acoustic metamaterial (APH-AM) was developed to gain broad sound absorption band by introducing multiple resonant chambers to enlarge the absorption bandwidth and tuning length of rear cavity for each chamber. Based on the coupling analysis of double resonators, the generation mechanism of broad sound absorption by adjusting the structural parameters was analyzed, which provided a foundation for the development of APH-AM with tunable chambers. Different from other optimization designs by theoretical modeling or finite element simulation, the adjustment of sound absorption performance for the proposed APH-AM could be directly conducted in transfer function tube measurement by changing the length of rear cavity for each chamber. According to optimization process of APH-AM, The target for all sound absorption coefficients above 0.9 was achieved in 602–1287 Hz with normal incidence and that for all sound absorption coefficients above 0.85 was obtained in 618–1482 Hz. The distributions of sound pressure for peak absorption frequency points were obtained in the finite element simulation, which could exhibit its sound absorption mechanism. Meanwhile, the sound absorption performance of the APH-AM with larger length of the aperture and that with smaller diameter of the aperture were discussed by finite element simulation, which could further show the potential of APH-AM in the low-frequency sound absorption. The proposed APH-AM could improve efficiency and accuracy in adjusting sound absorption performance purposefully, which would promote its practical application in low-frequency noise control. Full article
(This article belongs to the Special Issue Advanced Sound Absorption Materials and Applications)
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19 pages, 6862 KiB  
Article
Development and Optimization of Broadband Acoustic Metamaterial Absorber Based on Parallel–Connection Square Helmholtz Resonators
by Enshuai Wang, Fei Yang, Xinmin Shen, Haiqin Duan, Xiaonan Zhang, Qin Yin, Wenqiang Peng, Xiaocui Yang and Liu Yang
Materials 2022, 15(10), 3417; https://doi.org/10.3390/ma15103417 - 10 May 2022
Cited by 17 | Viewed by 2964
Abstract
An acoustic metamaterial absorber of parallel–connection square Helmholtz resonators is proposed in this study, and its sound absorption coefficients are optimized to reduce the noise for the given conditions in the factory. A two–dimensional equivalent simulation model is built to obtain the initial [...] Read more.
An acoustic metamaterial absorber of parallel–connection square Helmholtz resonators is proposed in this study, and its sound absorption coefficients are optimized to reduce the noise for the given conditions in the factory. A two–dimensional equivalent simulation model is built to obtain the initial value of parameters and a three–dimensional finite element model is constructed to simulate the sound absorption performance of the metamaterial cell, which aims to improve the research efficiency. The optimal parameters of metamaterial cells are obtained through the particle swarm optimization algorithm, and its effectiveness and accuracy are validated through preparing the experimental sample using 3D printing and measuring the sound absorption coefficient by the standing wave tube detection. The consistency between the experimental data and simulation data verifies feasibility of the proposed optimization method and usefulness of the developed acoustic metamaterial absorber, and the desired sound absorption performances for given conditions are achieved. The experimental results prove that parallel–connection square Helmholtz resonators can achieve an adjustable frequency spectrum for the low frequency noise control by parameter optimization, which is propitious to promote its application in reducing the noise in the factory. Full article
(This article belongs to the Special Issue Advanced Sound Absorption Materials and Applications)
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14 pages, 1951 KiB  
Article
Bending and Buckling of Circular Sandwich Plates with a Hardened Core
by Zizi Pi, Zilong Zhou, Zongbai Deng and Shaofeng Wang
Materials 2021, 14(16), 4741; https://doi.org/10.3390/ma14164741 - 22 Aug 2021
Cited by 3 | Viewed by 2230
Abstract
Hard-core sandwich plates are widely used in the field of aviation, aerospace, transportation, and construction thanks to their superior mechanical properties such as sound absorption, heat insulation, shock absorption, and so on. As an important form, the circular sandwich is very common in [...] Read more.
Hard-core sandwich plates are widely used in the field of aviation, aerospace, transportation, and construction thanks to their superior mechanical properties such as sound absorption, heat insulation, shock absorption, and so on. As an important form, the circular sandwich is very common in the field of engineering. Thus, theoretical analysis and numerical simulation of bending and buckling for isotropic circular sandwich plates with a hard core (SP-HC) are conducted in this study. Firstly, the revised Reissner’s theory was used to derive the bending equations of isotropic circular SP-HC for the first time. Then, the analytic solutions to bending deformation for circular and annular sandwich SP-HCs under some loads and boundary conditions were obtained through the decoupled simplification. Secondly, an analytic solution to bending deformation for a simply supported annular SP-HC under uniformly distributed bending moment and shear force along the inner edge was given. Finally, the differential equations of buckling for circular SP-HCs in polar coordinates were derived to obtain the critical loads of overall instability of SP-HC under simply supported and fixed-end supported boundary conditions. Meanwhile, the numerical simulations using Nastran software were conducted to compare with the theoretical analyses using Reissner’s theory and the derived models in this study. The theoretical and numerical results showed that the present formula proposed in this study can be suitable to both SP-HC and SP-SC. The efforts can provide valuable information for safe and stable application of multi-functional composite material of SP-HC. Full article
(This article belongs to the Special Issue Advanced Sound Absorption Materials and Applications)
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16 pages, 5301 KiB  
Article
Analysis of the Influence of Thickness and Density on Acoustic Absorption of Materials Made from Used Cigarette Butts
by Valentín Gómez Escobar, Celia Moreno González and Guillermo Rey Gozalo
Materials 2021, 14(16), 4524; https://doi.org/10.3390/ma14164524 - 12 Aug 2021
Cited by 8 | Viewed by 2174
Abstract
The effects of the density and thickness of samples made from used cigarette butts on acoustic characteristics were analyzed in this study. All the analyzed samples showed high acoustic performance, indicating that the fabrication of acoustic absorbing material may be a good use [...] Read more.
The effects of the density and thickness of samples made from used cigarette butts on acoustic characteristics were analyzed in this study. All the analyzed samples showed high acoustic performance, indicating that the fabrication of acoustic absorbing material may be a good use for this problematic waste (due to its toxicity, continuous generation, lack of recycling method, etc.). An increase in either density or thickness shifted the absorption characteristics of the samples to lower frequencies and increased the overall absorption. The relationships of the frequency and value of the maximum absorption coefficient with thickness and/or density were analyzed. The shift of the maximum absorption coefficient value due to varying thickness is in good agreement with previous studies. Full article
(This article belongs to the Special Issue Advanced Sound Absorption Materials and Applications)
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