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Farhat M, Achaoui Y, Martínez JAI, Addouche M, Wu Y, Khelif A. Observation of Ultra-High-Q Resonators in the Ultrasound via Bound States in the Continuum. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2402917. [PMID: 38962930 PMCID: PMC11434233 DOI: 10.1002/advs.202402917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 06/02/2024] [Indexed: 07/05/2024]
Abstract
The confinement of waves in open systems represents a fundamental phenomenon extensively explored across various branches of wave physics. Recently, significant attention is directed toward bound states in the continuum (BIC), a class of modes that are trapped but do not decay in an otherwise unbounded continuum. Here, the theoretical investigation and experimental demonstration of the existence of quasi-bound states in the continuum (QBIC) for ultrasonic waves are achieved by leveraging an elastic Fabry-Pérot metasurface resonator. Several intriguing properties of the ultrasound quasi-bound states in the continuum that are robust to parameter scanning are unveiled, and experimental evidence of a remarkable Q-factor of 350 at ≈1 MHz frequency, far exceeding the state-of-the-art using a fully acoustic underwater system is presented. The findings contribute novel insights into the understanding of BIC for acoustic waves, offering a new paradigm for the design of efficient, ultra-high Q-factor ultrasound devices.
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Affiliation(s)
- Mohamed Farhat
- Computer, Electrical, and Mathematical Sciences and Engineering DivisionKing Abdullah University of Science and Technology (KAUST)Thuwal23955‐6900Saudi Arabia
| | - Younes Achaoui
- Institut FEMTO‐ST, CNRS UMR 6174University Bourgogne Franche‐Comté15B Avenue des MontbouconsBesançon Cedex25000France
- Faculté des sciencesUniversité Moulay IsmailMeknesbp 11201Morocco
| | | | - Mahmoud Addouche
- Institut FEMTO‐ST, CNRS UMR 6174University Bourgogne Franche‐Comté15B Avenue des MontbouconsBesançon Cedex25000France
| | - Ying Wu
- Computer, Electrical, and Mathematical Sciences and Engineering DivisionKing Abdullah University of Science and Technology (KAUST)Thuwal23955‐6900Saudi Arabia
- Physical Science and Engineering (PSE) DivisionKing Abdullah University of Science and Technology (KAUST)Thuwal23955‐6900Saudi Arabia
| | - Abdelkrim Khelif
- Institut FEMTO‐ST, CNRS UMR 6174University Bourgogne Franche‐Comté15B Avenue des MontbouconsBesançon Cedex25000France
- College of Science and EngineeringHamad Bin Khalifa UniversityDohaQatar
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Chen Y, Hu J, Yin S, Zhang W, Huang W. Bimodal Absorber Frequencies Shift Induced by the Coupling of Bright and Dark Modes. MATERIALS (BASEL, SWITZERLAND) 2024; 17:3379. [PMID: 38998458 PMCID: PMC11243508 DOI: 10.3390/ma17133379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 07/01/2024] [Accepted: 07/05/2024] [Indexed: 07/14/2024]
Abstract
In this paper, we demonstrate that the absorption frequencies of the bimodal absorber shift with the coupling strength of the bright and dark modes. The coupling between the bright mode and the dark mode can acquire electromagnetically induced transparency, we obtain the analytical relationship between the absorbing frequencies, the resonant frequencies, losses of the bright mode and dark mode, and the coupling strength between two modes by combining the coupled mode theory with the interference theory. As the coupling strength between the bright mode and the dark mode decreases, the two absorption peaks gradually move closer to each other, inversely, they will move away from each other. The simulation employs three distinct metasurface structures with coupling of the bright and dark modes, thereby verifying the generality of the theoretical findings.
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Affiliation(s)
- Yun Chen
- Guangxi Key Laboratory of Optoelectronic Information Processing, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.C.); (S.Y.)
- School of Physical Science and Technology, Guangxi Normal University, Guilin 541004, China
| | - Jiangbo Hu
- Institute of Scientific and Technical Information of Guangxi Zhuang Autonomous Region, Nanning 530022, China;
| | - Shan Yin
- Guangxi Key Laboratory of Optoelectronic Information Processing, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.C.); (S.Y.)
| | - Wentao Zhang
- Guangxi Key Laboratory of Optoelectronic Information Processing, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.C.); (S.Y.)
| | - Wei Huang
- Guangxi Key Laboratory of Optoelectronic Information Processing, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China; (Y.C.); (S.Y.)
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Pham TS, Zheng H, Chen L, Khuyen BX, Lee Y. Wide-incident-angle, polarization-independent broadband-absorption metastructure without external resistive elements by using a trapezoidal structure. Sci Rep 2024; 14:10198. [PMID: 38702324 PMCID: PMC11068773 DOI: 10.1038/s41598-024-60171-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 04/19/2024] [Indexed: 05/06/2024] Open
Abstract
The absorption of electromagnetic waves in a broadband frequency range with polarization insensitivity and incidence-angle independence is greatly needed in modern technology applications. Many structures based on metamaterials have been suggested for addressing these requirements; these structures were complex multilayer structures or used special materials or external electric components, such as resistive ones. In this paper, we present a metasurface structure that was fabricated simply by employing the standard printed-circuit-board technique but provides a high absorption above 90% in a broadband frequency range from 12.35 to 14.65 GHz. The metasurface consisted of structural unit cells of 4 symmetric substructures assembled with a metallic bar pattern, which induced broadband absorption by using a planar resistive interaction in the pattern without a real resistive component. The analysis, simulation, and measurement results showed that the metasurface was also polarization insensitive and still maintained an absorption above 90% at incident angles up to 45°. The suggested metasurface plays a role in the fundamental design and can also be used to design absorbers at different frequency ranges. Furthermore, further enhancement of the absorption performance is achieved by improved design and fabrication.
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Affiliation(s)
- Thanh Son Pham
- Department of Physics and Quantum Photonic Science Research Center, Hanyang University, Seoul, 04763, Korea
- Alpha ADT, No.1202, 51-9, Dongtan Advanced Industrial, Hwaseong, 18469, Korea
- Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, 100000, Vietnam
| | - Haiyu Zheng
- Department of Physics and Quantum Photonic Science Research Center, Hanyang University, Seoul, 04763, Korea
- Alpha ADT, No.1202, 51-9, Dongtan Advanced Industrial, Hwaseong, 18469, Korea
| | - Liangyao Chen
- Department of Optical Science and Engineering, Fudan University, Shanghai, 200433, China
| | - Bui Xuan Khuyen
- Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, 100000, Vietnam
| | - YoungPak Lee
- Department of Physics and Quantum Photonic Science Research Center, Hanyang University, Seoul, 04763, Korea.
- Alpha ADT, No.1202, 51-9, Dongtan Advanced Industrial, Hwaseong, 18469, Korea.
- Department of Optical Science and Engineering, Fudan University, Shanghai, 200433, China.
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4
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Li J, Shi L, Chen H, Qu L, Yi Y, Zhang Q, Ma Y, Wang J. Causal optimal and optically transparent ultra-wideband microwave metamaterials absorber with high angular stability. OPTICS EXPRESS 2023; 31:44385-44400. [PMID: 38178511 DOI: 10.1364/oe.494213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 07/01/2023] [Indexed: 01/06/2024]
Abstract
Wideband microwave absorbers, especially those with high optical transparency, are significantly used in civil and military fields. This paper proposes an ultra-wideband optically transparent metamaterial absorber (MMA) with causal optimal thickness and high angular stability. Based on the equivalent circuits model of the MMA, a genetic algorithm is adopted to identify the best circuit parameters that can realize broadband microwave absorption. High transparent indium tin oxide and poly-methyl methacrylate are utilized to realize the absorber. Optimization and simulation results show that the designed MMA presents a high microwave absorption above 90%, covering a wide frequency of 2.05-15.5 GHz with an impressive FBW of 153.3%. The proposed MMA exhibits extraordinary angular stability. For TM polarization, it can still maintain a fractional bandwidth (FBW) over 114.5% at an incidence angle of 70° and over 142% at an incidence angle of 60°, while the FBW of both TE polarization and TM polarization exceeds 150% when the incidence angle is below 45°. Furthermore, the proposed absorber has the advantages of high transparency and polarization insensitiveness. A prototype of the proposed MMA is fabricated and experimentally tested. The measured results are in excellent agreement with the optimized design and the full-wave simulation results, demonstrating its excellent performance. Most significantly, the overall thickness of the absorber is 0.102 λ at the lowest working frequency and only 1.08 times the causality-dictated minimum sample thickness. The MMA proposed herein provides methods to achieve high compatibility with wideband microwave absorption, optical transparency, and wide-angle incidence, thus enabling a wide range of applications in stealth, electromagnetic pollution reduction, and electromagnetic compatible facilities.
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Chen T, Chen J, Yi Z, Zheng C, Zhou L, Wu Y, Cai F, Qin J, Hong Z, Huang Y. Enhanced Ultrasound Transmission through Skull Using Flexible Matching Layer with Gradual Acoustic Impedance. ACS APPLIED MATERIALS & INTERFACES 2023; 15:55510-55517. [PMID: 37991837 DOI: 10.1021/acsami.3c13872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
Transcranial ultrasound imaging and therapy have gained significant attention due to their noninvasive nature, absence of ionizing radiation, and portability. However, the presence of the skull, which has a high acoustic impedance, presents a challenge for the penetration of ultrasound into intracranial tissue. This leads to a low transmission of ultrasound through the skull, hindering energy focusing and imaging quality. To address this challenge, we propose a novel approach that utilizes a flexible matching layer with gradual acoustic impedance to enhance ultrasound transmission through the skull. This matching layer is constructed using Poly(dimethylsiloxane) (PDMS)/tungsten powders as the structural component responsible for the gradual impedance, while agarose serves as the flexible matrix. Our simulation and experimental results demonstrate that the matching layer with an exponential gradual acoustic impedance significantly improves the ultrasound transmission coefficient across a wide frequency range compared to traditional quarter wavelength matching layers. Specifically, at 2 MHz, the maximum transmission coefficient reaches 49.5%, more than four times higher than that of the skull without a matching layer (only 11.7%). Additionally, the good flexibility of our matching layer ensures excellent adhesion to the curved surface of the skull, further enhancing its application potential in transcranial ultrasound imaging and therapy. The improved transmission performance allows for a lower ultrasound transmission power, effectively addressing overheating and safety issues.
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Affiliation(s)
- Tiantian Chen
- School of Materials Science and Engineering, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Jie Chen
- School of Materials Science and Engineering, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Zhenyu Yi
- School of Materials Science and Engineering, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Congqin Zheng
- School of Materials Science and Engineering, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Linming Zhou
- School of Materials Science and Engineering, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Yongjun Wu
- School of Materials Science and Engineering, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Feiyan Cai
- Paul C. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Jiale Qin
- Department of Ultrasound, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310006, China
| | - Zijian Hong
- School of Materials Science and Engineering, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou, Zhejiang 310027, China
| | - Yuhui Huang
- School of Materials Science and Engineering, State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou, Zhejiang 310027, China
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Zhou X, Wang X, Xin F. Ultrathin acoustic metamaterial as super absorber for broadband low-frequency underwater sound. Sci Rep 2023; 13:7983. [PMID: 37198226 DOI: 10.1038/s41598-023-34993-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 05/11/2023] [Indexed: 05/19/2023] Open
Abstract
In this work, an ultrathin acoustic metamaterial formed by space-coiled water channels with a rubber coating is proposed for underwater sound absorption. The proposed metamaterial achieves perfect sound absorption ([Formula: see text] > 0.99) at 181 Hz, which has a deep subwavelength thickness ([Formula: see text]). The theoretical prediction is consistent with the numerical simulation, which demonstrate the broadband low-frequency sound absorption performance of the proposed super absorber. The introduction of rubber coating leads to a significant decrease of the effective sound speed in the water channel, resulting in the phenomenon of slow-sound propagation. From the perspective of numerical simulations and acoustic impedance analysis, it is proved that the rubber coating on the channel boundary causes slow-sound propagation with inherent dissipation, which is the key to meet the impedance matching condition and achieve perfect low-frequency sound absorption. Parametric studies are also carried out to investigate the effect of specific structural and material parameters on sound absorption. By tailoring key geometric parameters, an ultra-broadband underwater sound absorber is constructed, with a perfect absorption range of 365-900 Hz and a deep subwavelength thickness of 33 mm. This work paves a new way for designing underwater acoustic metamaterials and controlling underwater acoustic waves.
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Affiliation(s)
- Xindong Zhou
- State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China
- MOE Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China
| | - Xiaochen Wang
- State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China
- MOE Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China
| | - Fengxian Xin
- State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China.
- MOE Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China.
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Wang B, Qiao C, Wang YL, Dong X, Zhang W, Lu Y, Yuan J, Zeng H, Wang H. Multifunctional Underwater Adhesive Film Enabled by a Single-Component Poly(ionic liquid). ACS NANO 2023; 17:5871-5879. [PMID: 36926859 DOI: 10.1021/acsnano.2c12767] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Tremendous efforts have been devoted to exploiting synthetic wet adhesives for real-life applications. However, developing low-cost, robust, and multifunctional wet adhesive materials remains a considerable challenge. Herein, a wet adhesive composed of a single-component poly(ionic liquid) (PIL) that enables fast and robust underwater adhesion is reported. The PIL adhesive film possesses excellent stretchability and flexibility, enabling its anchoring on target substrates regardless of deformation and water scouring. Surface force measurements show the PIL can achieve a maximum adhesion of 56.7 mN·m-1 on diverse substrates (both hydrophilic and hydrophobic substrates) in aqueous media, within ∼30 s after being applied. The adhesion mechanisms of the PIL were revealed via the force measurements, and its robust wet adhesive capacity was ascribed to the synergy of different non-covalent interactions, such as of hydrogen bonding, cation-π, electrostatic, and van der Waals interactions. Surprisingly, this PIL adhesive film exhibited impressive underwater sound absorption capacity. The absorption coefficient of a 0.7 mm-thick PIL film to 4-30 kHz sound waves could be as high as 0.80-0.92. This work reports a multifunctional PIL wet adhesive that has promising applications in many areas and provides deep insights into interfacial interaction mechanisms underlying the wet adhesion capability of PILs.
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Affiliation(s)
- Binmin Wang
- Key Laboratory of Functional Polymer Materials (Ministry of Education), Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Chenyu Qiao
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Yong-Lei Wang
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm 10691, Sweden
- Department of Electrochemical Energy Storage, Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany
| | - Xiaoxiao Dong
- Key Laboratory of Functional Polymer Materials (Ministry of Education), Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Wangqing Zhang
- Key Laboratory of Functional Polymer Materials (Ministry of Education), Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Yan Lu
- Department of Electrochemical Energy Storage, Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany
| | - Jiayin Yuan
- Department of Materials and Environmental Chemistry, Stockholm University, Stockholm 10691, Sweden
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Hong Wang
- Key Laboratory of Functional Polymer Materials (Ministry of Education), Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
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8
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Study on the phase structure and sound absorption properties of Eucommia ulmoides gum composites. POLYMER 2023. [DOI: 10.1016/j.polymer.2023.125801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
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9
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Kang Y, Yang H, Wang C, Li Y, Xu P. Plasmonic field-regulating characteristics of alloy-based multilaminar films in 300-800 nm. Heliyon 2023; 9:e13084. [PMID: 36785831 PMCID: PMC9918773 DOI: 10.1016/j.heliyon.2023.e13084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 01/11/2023] [Accepted: 01/16/2023] [Indexed: 01/21/2023] Open
Abstract
Based on a petal-like microstructure model of alloy particles we proposed, the field-regulating characteristics of alloy-based metamaterial films in the wavelength range of 300-800 nm are analyzed. It is found that Au/Ag alloy particles can support a broader resonance band with higher averaged resonance intensities than that of pure silver or gold particles, which, named alloy plasmonic effect, proves to be a universal feature of alloy-based plasmonics. Upon optimizing the coupling interaction between the alloy plasmonic effect and absorption saturation effect within alloy-based multilaminar structures, a broadband electromagnetic wave absorber consisting of a Cu/Al alloy-based composites layer and an aluminum base layer is demonstrated. Furthermore, a generalized method is proposed to evaluate the absorption performance of this kind of plasmonic absorber. The achieved alloy-based absorber proves to be nearly non-iridescent and the quality factor AP throughout the range of 300-800 nm remains higher than 0.8 even if the incident angle increases up to 60°.
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Affiliation(s)
- Yifan Kang
- Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an 710119, China,University of Chinese Academy of Sciences, Beijing 100049, China,Air Force Engineering University, Xi'an 710051, China
| | - Hongtao Yang
- Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an 710119, China
| | - Chao Wang
- Center for Attosecond Science and Technology, State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an 710119, China,Corresponding author.
| | - Yongfeng Li
- Department of Microelectronics, School of Electronic Engineering, Xi'an University of Posts & Telecommunications, Xi'an 710121, China
| | - Peng Xu
- Center for Attosecond Science and Technology, State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi'an 710119, China
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Li Z, Li X, Wang Z, Zhai W. Multifunctional sound-absorbing and mechanical metamaterials via a decoupled mechanism design approach. MATERIALS HORIZONS 2023; 10:75-87. [PMID: 36300521 DOI: 10.1039/d2mh00977c] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Multifunctional materials are in high demand for practical engineering applications. Owing to the ubiquitous noise and impact energy hazards in many settings, traditional materials and conventionally designed metamaterials are incapable of preventing these types of hazard simultaneously. Herein, we report a new paradigm, via a decoupled approach, in the design of acousto-mechanical multifunctional metamaterials. We leverage the morphology of a Helmholtz resonator, such that the sound-absorbing and mechanical components are designed independently. For sound absorption, we adopt a coherent coupling design for a favorable resonant response, while for the mechanical response, we adopt customized struts. We then demonstrate our concept via 3D printing. Experimentally measured remarkable broadband absorption in the practical low-frequency range (<1.0 kHz) is achieved. Absorption mechanisms are attributed to viscous and thermal boundary dissipation. Compression tests also reveal that the metamaterials are highly deformation resilient with a recovery of up to 98%, owing to both the lattice structure design and the viscoelastic behavior of the base material. Through this decoupled design, we further demonstrate the potential of our metamaterials in customizable absorption, strength, pseudo-reusability, and impact resistance. The proposed design paradigm broadens the horizon for the design of multifunctional materials, offering an impetus to their exploration for practical applications.
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Affiliation(s)
- Zhendong Li
- School of Traffic & Transportation Engineering, Central South University, Changsha 410075, Hunan, China.
- Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore.
| | - Xinwei Li
- Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore.
| | - Zhonggang Wang
- School of Traffic & Transportation Engineering, Central South University, Changsha 410075, Hunan, China.
| | - Wei Zhai
- Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore.
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Yang F, Bi S, Shen X, Li Z, Zhang X, Wang E, Yang X, Peng W, Huang C, Liang P, Sun G. Adjustable Sound Absorber of Multiple Parallel-Connection Helmholtz Resonators with Tunable Apertures Prepared by Low-Force Stereolithography of Photopolymer Resin. Polymers (Basel) 2022; 14:polym14245434. [PMID: 36559802 PMCID: PMC9786290 DOI: 10.3390/polym14245434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 12/07/2022] [Accepted: 12/09/2022] [Indexed: 12/14/2022] Open
Abstract
The variable noise spectrum for many actual application scenarios requires a sound absorber to adapt to this variation. An adjustable sound absorber of multiple parallel-connection Helmholtz resonators with tunable apertures (TA-MPCHRs) is prepared by the low-force stereolithography of photopolymer resin, which aims to improve the applicability of the proposed sound absorber for noise with various frequency ranges. The proposed TA-MPCHR metamaterial contains five metamaterial cells. Each metamaterial cell contains nine single Helmholtz resonators. It is treated as a basic structural unit for an array arrangement. The tunable aperture is realized by utilizing four segments of extendable cylindrical chambers with length l0, which indicates that the length of the aperture l is in the range of [l0, 4l0], and that it is tunable. With a certain group of specific parameters for the proposed TA-MPCHR, the influence of the tunable aperture with a variable length is investigated by acoustic finite element simulation with a two-dimensional rotational symmetric model. For the given noise spectrum of certain actual equipment with four operating modes, the TA-MPCHR sample with a limited total thickness of 40 mm is optimized, which is made of photopolymer resin by the low-force stereolithography, and its actual average sound absorption coefficients for the frequency ranges of 500-800 Hz, 550-900 Hz, 600-1000 Hz and 700-1150 Hz reach 0.9203, 0.9202, 0.9436 and 0.9561, respectively. Relative to common non-adjustable metamaterials, the TA-MPCHR made of photopolymer resin can reduce occupied space and improve absorption efficiency, which is favorable in promoting its practical applications in the noise pollution prevention.
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Affiliation(s)
- Fei Yang
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
| | - Shaohua Bi
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
| | - Xinmin Shen
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
- Correspondence: (X.S.); (Z.L.); Tel.: +86-025-8082-1451 (X.S.)
| | - Zhizhong Li
- State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, College of Defense Engineering, Army Engineering University of PLA, Nanjing 210007, China
- Correspondence: (X.S.); (Z.L.); Tel.: +86-025-8082-1451 (X.S.)
| | - Xiangpo Zhang
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
| | - Enshuai Wang
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
| | - Xiaocui Yang
- Engineering Training Center, Nanjing Vocational University of Industry Technology, Nanjing 210023, China
- MIIT Key Laboratory of Multifunctional Lightweight Materials and Structures (MLMS), Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Wenqiang Peng
- College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China
| | - Changchuang Huang
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
| | - Peng Liang
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
| | - Guoxin Sun
- Field Engineering College, Army Engineering University of PLA, Nanjing 210007, China
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12
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A Flexible Meta-Curtain for Simultaneous Soundproofing and Ventilation. Symmetry (Basel) 2022. [DOI: 10.3390/sym14112348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
We demonstrate a flexible meta-curtain that can simultaneously block the propagation of sound waves of selected frequencies and let air flow through freely. Such a meta-curtain is assembled by two soft and perforated polyvinyl chloride films with an optimized distance between them. The total thickness of the meta-curtain is 1.16 cm and the holes on it have a diameter of 5 cm. The functionality of soundproofing is bestowed by the resonances formed between the films, which is verified by band structure analysis, numerical simulations, and experimental measurements. We experimentally observed sound transmission loss with a peak of 50 dB near 1700 Hz and an average of 26 dB from 1000 Hz to 1760 Hz, which is consistent with the numerical results. Attributing to the softness of the films and the robustness of the resonance, this meta-curtain retains its functionality even at deformations such as bending. Our work paves a way toward soundproof structures with the advantages of ventilation, flexibility, and light weight.
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