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Advances in Emerging Acoustic Materials

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

Deadline for manuscript submissions: closed (20 October 2023) | Viewed by 4738

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Special Issue Editors

Dr. Jie Deng

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Guest Editor

School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
Interests: acoustic black holes; vibroacoustic control; sound absorption; acoustic metamaterials; phononic crystals; structural dynamics; vibration energy harvesting; Rayleigh-Ritz method, statistical energy analysis

Dr. Nansha Gao

E-Mail Website
Guest Editor

School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
Interests: noise and vibration reduction; acoustic metamaterial; underwater absorption/insulation; composite porous metastructure
Special Issues, Collections and Topics in MDPI journals

Prof. Dr. Long Bai

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Guest Editor

State Key Laboratory of Mechanical Transmission, College of Mechanical and Vehicle Engineering Chongqing University, Chongqing 400044, China
Interests: robotics; lattice structures; metamaterial

Special Issue Information

Dear Colleagues,

In recent years, noise pollution has become a significant global problem and, unfortunately, conventional acoustic materials cannot offer substantial improvements in its reduction. Presently, the rapid development of emerging acoustic materials, exemplified by acoustic metamaterials, acoustic black holes, and phononic crystals, are providing new solutions for controlling sound waves and have huge potential for mitigating noise propagation, drawing the attention of researchers worldwide. These technologies are often both lightweight and compact and capable of reducing noise from low to high frequencies. Recent progress has illustrated that acoustic metamaterials effectively control sound waves, and optimizing their structure enables functionality based on new physical phenomena.

This Special Issue aims to prompt the development of emerging acoustic materials, the underlying physical mechanism, application scenarios, and emerging research trends for both passive and active noise reduction metamaterials. The articles presented in this Special Issue will cover various topics ranging from, but not limited to, the following topics:

Acoustic black holes for vibration reduction;
New designs for sound absorption and insulation;
Acoustic lenses and novel refractive devices for energy harvesting;
Advances in porous materials;
Digital and programmable acoustic metamaterials;
Optimization design for phononic crystals;
Deep learning-based approaches in phononics;
Nanophononics and integrated systems;
Any other topics or approaches not covered in the above list but addressing the same goal.

Dr. Jie Deng
Dr. Nansha Gao
Prof. Dr. Long Bai
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

acoustic black holes
vibroacoustic control
sound absorption
acoustic metamaterials
phononic crystals
bandgaps

Published Papers (4 papers)

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Research

19 pages, 8300 KiB

Open AccessArticle

Quasi-Static Modelling of a Full-Channel Effective Magnetorheological Damper with Trapezoidal Magnetic Rings

by Huan Wu, Yiming Hu, Yinong Li, Sanbao Gu, Ziyang Yue, Xiaoxue Yang and Ling Zheng

Materials 2023, 16(20), 6820; https://doi.org/10.3390/ma16206820 - 23 Oct 2023

Viewed by 721

Abstract

Magnetorheological damper (MRD) has been successfully applied to vehicle suspension systems as an intelligent core component. Most conventional MRDs have closed rectangle-shaped magnetic circuits, resulting in a short effective working length and negligible damping force. To address the above issues, a novel full-channel effective MRD with trapezoidal magnetic rings (FEMRD_TMR) is proposed. The trapezoidal magnetic ring can shunt the magnetic circuit, distributing it evenly along the damping channel and increasing the effective working length. Additionally, which has the same variation trend as the magnetic flux through it, makes the magnetic induction intensity distribution more uniform to reduce the magnetic saturation problem. Theoretically analyzing the damping characteristics of the FEMRD_TMR, a quasi-static model is developed to forecast the output damping force. The structural design of MRD is challenging since conventional quasi-static models rely on the yield stress of magnetorheological fluid (MRF) to reflect the rheological property, which cannot be directly observed and is challenging to calculate. The Takagi–Sugeno (T–S) fuzzy neural network and a unique magnetic circuit computation are offered as a novel quasi-static modeling approach to address the issue. The MRF’s yield stress is linearized into magnetic induction intensity functions by the T–S fuzzy neural network and then converted into the MRD’s structural size by the special magnetic circuit calculation. Therefore, the proposed quasi-static model can directly reflect the relationship between the damping force and structure size, simplifying MRD’s structure design. The novel quasi-static model is shown to be more straightforward and understandable than the conventional Bingham quasi-static model and to have approximately accurate damping force prediction when compared to experimental data. Full article

(This article belongs to the Special Issue Advances in Emerging Acoustic Materials)

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17 pages, 5492 KiB

Open AccessArticle

Sustainable Perforated Acoustic Wooden Panels Designed Using Third-Degree-of-Freedom Bezier Curves with Broadband Sound Absorption Coefficients

by Bartlomiej Chojnacki, Kamil Schynol, Mateusz Halek and Alicja Muniak

Materials 2023, 16(18), 6089; https://doi.org/10.3390/ma16186089 - 06 Sep 2023

Cited by 1 | Viewed by 1009

Abstract

The current interior design scope places high demands on acoustic treatment manufacturers. The state of the art does not provide satisfactory material proposals for architects to satisfy design needs. There is a need for a novel approach concerning decorative, recognized materials that adapts them to the acoustic surface properties. The final design proposed in this study presents a modern functional solution with high acoustic properties, which can be produced with sustainable materials such as FSC wood and has a low environmental impact because of its low waste production. This research presents the complete design process of a novel type of wooden acoustic panel. A comprehensive explanation of the scientific development is covered, including basic material testing in an impedance tube, FEM simulations of the initial designs, and final measurements in a reverberation chamber. The solution’s novelty is based on the optimized placement of the perforation holes on the surface of a wooden overlay using a ship deck optimization algorithm. The methods used cover the original solution of mixing FEM modeling of the surface impedance with the application of the Jeong–Thomasson correction for random incidence sound absorption coefficient simulation. The contribution of this research is the development of wooden perforated panels with Class A sound absorption and an overall depth of 90 mm, including the 50 mm depth of the backing material. The discussion will explain the difficulties of working with this material and the need for a combination of the aesthetic and acoustic sides of the project. Full article

(This article belongs to the Special Issue Advances in Emerging Acoustic Materials)

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17 pages, 6550 KiB

Open AccessArticle

Multimodal Local Resonators for Low-Frequency Amelioration of Acoustic Black Holes

by Jing Zhao, Zhixin Ma, Yiyang Hu, Jiacheng Zeng, Yuxin Xu, Jie Deng and Nansha Gao

Materials 2023, 16(13), 4579; https://doi.org/10.3390/ma16134579 - 25 Jun 2023

Viewed by 1165

Abstract

Acoustic black holes (ABHs) are effective at suppressing vibrations at high frequencies, but their performance at low frequencies is limited. This paper aims to improve the low-frequency performance of ABH plates through the design of a metamaterial acoustic black hole (MMABH) plate. The MMABH plate consists of a double-layer ABH plate with a set of periodic local resonators installed between the layers. The resonators are tuned to the low-frequency peak points of the ABH plate, which are identified using finite element analysis. To dissipate vibration energy, the beams of the resonators are covered with damping layers. A modal analysis of the MMABH plate is performed, confirming its damping effect over a wide frequency band, especially at low frequencies. Full article

(This article belongs to the Special Issue Advances in Emerging Acoustic Materials)

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15 pages, 4775 KiB

Open AccessArticle

Numerical Study of Casing Microleakage Flow Field Sensitivity and Acoustic Field Characteristics

by Jingcui Li, Jifang Wan, Hangming Liu, Xianzhong Yi, Yuxian He, Kang Chen and Xinbo Zhao

Materials 2023, 16(1), 386; https://doi.org/10.3390/ma16010386 - 31 Dec 2022

Cited by 2 | Viewed by 982

Abstract

The casing leakage phenomenon seriously affects the safety and economic problems of oil and gas production and transportation. In this paper, the numerical simulation study of the casing’s micro-leakage flow field and acoustic field is carried out by taking the oil and gas well casing as the research object. The CFD numerical model of the casing micro-leakage is established, and the influence of the size of the leakage hole, the shape of the leakage hole, and the pressure difference between the inside and outside the casing on the microleakage flow field is analyzed. An acoustic-vibroacoustic coupling calculation model based on Fluent and LMS Virtual LAB is established, and the sound pressure value and distribution at different frequencies are calculated. The results show that the flow rate of the leakage hole increases with the pressure difference between the inside and the outside leakage hole and the area of the leakage hole. Moreover, the flow rate of the circular leakage hole is higher for the same leakage hole area. The simulation model based on the equivalent sound source can be used to calculate and analyze the sound field in the tubing. By sound field computation based on the near-field equivalent sound source, when the frequency is 32,000 Hz, the amplitude of sound pressure is maximum. In addition, the sound pressure is greatly reduced once the sound wave passes through the tubing pipeline. Lastly, the sound pressure is higher at the position facing the leakage hole in the tubing, making detecting the leakage sound field signal easier. The results can provide a reference for further research on oil casing microleakage detection technology. Full article

(This article belongs to the Special Issue Advances in Emerging Acoustic Materials)

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