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Choi E, Jeon W. Near-perfect sound absorption using hybrid resonance between subwavelength Helmholtz resonators with non-uniformly partitioned cavities. Sci Rep 2024; 14:3174. [PMID: 38326525 PMCID: PMC10850328 DOI: 10.1038/s41598-024-53595-y] [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: 08/26/2023] [Accepted: 02/02/2024] [Indexed: 02/09/2024] Open
Abstract
We present near-perfect sound absorption using a metasurface composed of meta-atoms (MAs) which are subwavelength Helmholtz resonators (HRs) with cavities non-uniformly partitioned by membranes. By embedding the membranes at different horizontal locations in the cavities, we break geometrical symmetry between the MAs so as to derive hybrid resonance between the MAs at our target frequency. The resonance frequency of each MA is determined by delicately adjusting the locations of the membranes, resulting in perfect absorption at the target frequency which is different from the resonance frequencies of MAs. The metasurface is designed to satisfy impedance matching conditions with air at one or more target frequencies with the aid of a theoretical model for frequency-dependent effective acoustic impedance. The theoretical model is established with physical reality by considering the higher-order eigenmodes of the membrane, the visco-thermal losses in narrow orifices, and the end corrections of the subwavelength HR. The designed metasurface is fabricated and its absorption performance is verified experimentally in an impedance tube. Near-perfect absorption of sound is achieved at the target frequency of 500 Hz, which is 12.3% lower than that of near-perfect absorption by previous metasurfaces inducing hybrid resonance between HRs without membranes.
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Affiliation(s)
- Eunji Choi
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Wonju Jeon
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea.
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2
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Zhang L, Xin F. Perfect low-frequency sound absorption of rough neck embedded Helmholtz resonators. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2022; 151:1191. [PMID: 35232096 DOI: 10.1121/10.0009529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 01/19/2022] [Indexed: 06/14/2023]
Abstract
In this paper, an acoustic metamaterial, composed of rough neck embedded Helmholtz resonators, is proposed to achieve perfect sound absorption in the low-frequency range. The wall shape of the embedded neck in Helmholtz resonators can be adjusted to improve the low-frequency sound absorption performance of acoustic metamaterials. As a concern, a full-rough neck embedded Helmholtz resonator (FR-NEHR) is designed, which achieves perfect sound absorption (α>0.999) with a deep subwavelength thickness ( λ/44) at 150 Hz. A theoretical model is developed to predict the performance of the FR-NEHR, which is validated against the experimental measurement and numerical simulation. The results show that for the rough embedded neck, when the axial and circumferential roughness of the neck exist, the sound energy dissipation increases not only in the neck but also in the air cavity. As a result, the acoustic absorption peak value of the FR-NEHR increases 20.2%, and the peak position shifts 20.2% to a lower frequency. This work extends Maa's 50-year-old sound absorption theory from smooth channels to full-rough channels, further developing the traditional channel sound absorption theory. It provides useful guidance for the structural design of broadband low-frequency sound-absorbing metamaterials.
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Affiliation(s)
- Lei Zhang
- State Key Laboratory for Strength and Vibration of Mechanical 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
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Low-Frequency, Open, Sound-Insulation Barrier by Two Oppositely Oriented Helmholtz Resonators. MICROMACHINES 2021; 12:mi12121544. [PMID: 34945394 PMCID: PMC8706626 DOI: 10.3390/mi12121544] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 12/03/2021] [Accepted: 12/09/2021] [Indexed: 11/16/2022]
Abstract
In this work, a low-frequency, open, sound-insulation barrier, composed of a single layer of periodic subwavelength units (with a thickness of λ/28), is demonstrated both numerically and experimentally. Each unit was constructed using two identical, oppositely oriented Helmholtz resonators, which were composed of a central square cavity surrounded by a coiled channel. In the design of the open barrier, the distance between two adjacent units was twice the width of the unit, showing high-performance ventilation, and low-frequency sound insulation. A minimum transmittance of 0.06 could be observed around 121.5 Hz, which arose from both sound reflections and absorptions, created by the coupling of symmetric and asymmetric eigenmodes of the unit, and the absorbed sound energy propagating into the central cavity was greatly reduced by the viscous loss in the channel. Additionally, by introducing a multilayer open barrier, a broadband sound insulation was obtained, and the fractional bandwidth could reach approximately 0.19 with four layers. Finally, the application of the multilayer open barrier in designing a ventilated room was further discussed, and the results presented an omnidirectional, broadband, sound-insulation effect. The proposed open, sound-insulation barrier with the advantages of ultrathin thickness; omnidirectional, low-frequency sound insulation; broad bandwidth; and high-performance ventilation has great potential in architectural acoustics and noise control.
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Shao C, Xiong W, Long H, Tao J, Cheng Y, Liu X. Ultra-sparse metamaterials absorber for broadband low-frequency sound with free ventilation. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2021; 150:1044. [PMID: 34470305 DOI: 10.1121/10.0005850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
An absorptive device for broadband low-frequency sound with ventilation is essential but challenging in acoustic engineering, which is subjected to the narrow-band limitation and difficulty of balancing high-efficiency absorption and excellent ventilation. Here, we have theoretically and experimentally demonstrated an ultra-sparse (with filling ratio of 53.7%) broadband metamaterial absorber which can efficiently absorb (absorptance >90%) sound energy ranging from 307 to 341 Hz, while enabling air to flow freely. The broadband absorber is constructed by parallel coupling four ventilated metamaterials absorbers (VMAs) showing different operating frequencies. Each VMA is composed of three folded Fabry-Pérot resonators as paste components, which are patched subsequently to the walls of a waveguide and correspondingly act as dark, middle, and bright modes following the coupled mode theory. In the VMA, the dark mode is highly over-damped to absorb sound energy, while the bright mode is highly under-damped to be an effective acoustic soft boundary, and the middle mode in-between should be slightly over-damped to strengthen the absorptions. Further investigation demonstrates that broadband high-efficiency absorption is robust against oblique incident angles. The proposed VMA provides a clear scheme for efficiently absorbing low-frequency sound while allowing free air flow simultaneously, which may prompt versatile applications in noise control.
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Affiliation(s)
- Chen Shao
- Key Laboratory of Modern Acoustics, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Wei Xiong
- Key Laboratory of Modern Acoustics, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Houyou Long
- Key Laboratory of Modern Acoustics, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Jiancheng Tao
- Key Laboratory of Modern Acoustics, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Ying Cheng
- Key Laboratory of Modern Acoustics, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Xiaojun Liu
- Key Laboratory of Modern Acoustics, Department of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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Li X, Becker T, Ravasi M, Robertsson J, van Manen DJ. Closed-aperture unbounded acoustics experimentation using multidimensional deconvolution. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2021; 149:1813. [PMID: 33765824 DOI: 10.1121/10.0003706] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 02/19/2021] [Indexed: 06/12/2023]
Abstract
In physical acoustic laboratories, wave propagation experiments often suffer from unwanted reflections at the boundaries of the experimental setup. We propose using multidimensional deconvolution (MDD) to post-process recorded experimental data such that the scattering imprint related to the domain boundary is completely removed and only the Green's functions associated with a scattering object of interest are obtained. The application of the MDD method requires in/out wavefield separation of data recorded along a closed surface surrounding the object of interest, and we propose a decomposition method to separate such data for arbitrary curved surfaces. The MDD results consist of the Green's functions between any pair of points on the closed recording surface, fully sampling the scattered field. We apply the MDD algorithm to post-process laboratory data acquired in a two-dimensional acoustic waveguide to characterize the wavefield scattering related to a rigid steel block while removing the scattering imprint of the domain boundary. The experimental results are validated with synthetic simulations, corroborating that MDD is an effective and general method to obtain the experimentally desired Green's functions for arbitrary inhomogeneous scatterers.
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Affiliation(s)
- Xun Li
- Institute of Geophysics, Eidgenössische Technische Hochschule Zurich, Sonneggstrasse 5, 8092 Zurich, Switzerland
| | - Theodor Becker
- Institute of Geophysics, Eidgenössische Technische Hochschule Zurich, Sonneggstrasse 5, 8092 Zurich, Switzerland
| | - Matteo Ravasi
- Earth Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955, Kingdom of Saudi Arabia
| | - Johan Robertsson
- Institute of Geophysics, Eidgenössische Technische Hochschule Zurich, Sonneggstrasse 5, 8092 Zurich, Switzerland
| | - Dirk-Jan van Manen
- Institute of Geophysics, Eidgenössische Technische Hochschule Zurich, Sonneggstrasse 5, 8092 Zurich, Switzerland
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Shao C, Liu C, Ma C, Long H, Chen K, Cheng Y, Liu X. Multiband asymmetric sound absorber enabled by ultrasparse Mie resonators. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2021; 149:2072. [PMID: 33810767 DOI: 10.1121/10.0003822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 03/02/2021] [Indexed: 06/12/2023]
Abstract
On the quest towards efficiently eliminating noises, the development of a subwavelength sound absorber with the capability of free ventilation remains challenging. Here, we theoretically propose and experimentally demonstrate an asymmetric metamaterial absorber constructed by tuned Mie resonators (MRs) with unbalanced intrinsic losses. The lossy MR layer is highly dissipative to consume the sound energy while the lossless one acts as an acoustically soft boundary. Thus, the absorber presents quasi-perfect absorption (95% in experiment) for sound waves incident from the port nearer the dissipative MR and large-amount reflection (71% in experiment) from the opposite port. Moreover, the fluid dynamics investigation confirms the superior character of free air circulation owing to the ultrasparsity (volume filling ratio as low as 5%) of the absorber and its robustness to the velocity of airflows. Due to the multiple-order resonant modes of MR, we further demonstrate the flexibility of a methodology to extend asymmetric absorptions into multibands. Coupled mode analysis is employed to reveal the physical mechanism and further indicates that sparsity can be tuned by attentively controlling the reference leakage factor and intrinsic loss.
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Affiliation(s)
- Chen Shao
- Department of Physics, Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China
| | - Chen Liu
- Department of Physics, Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China
| | - Chengrong Ma
- Department of Physics, Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China
| | - Houyou Long
- Department of Physics, Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China
| | - Kai Chen
- Department of Physics, Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China
| | - Ying Cheng
- Department of Physics, Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China
| | - Xiaojun Liu
- Department of Physics, Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China
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Muhazeli NS, Nordin NA, Ubaidillah U, Mazlan SA, Abdul Aziz SA, Nazmi N, Yahya I. Magnetic and Tunable Sound Absorption Properties of an In-Situ Prepared Magnetorheological Foam. MATERIALS 2020; 13:ma13245637. [PMID: 33321851 PMCID: PMC7763640 DOI: 10.3390/ma13245637] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 12/05/2020] [Accepted: 12/07/2020] [Indexed: 11/16/2022]
Abstract
Conventional polyurethane foam has non-tunable sound absorption properties. Here, a magneto-induced foam, called magnetorheological (MR) foam, was fabricated with the feature of being able to tune sound absorption properties, primarily from the middle- to higher-frequency ranges. Three different samples of MR foams were fabricated in situ by varying the concentration of Carbonyl Iron Particles (CIPs) (0, 35, and 75 wt.%). The magnetization properties and tunable sound absorption characteristics were evaluated. From the magnetic saturation properties, the results showed very narrow and small coercivity of hysteresis loops relative to the soft magnetic properties of the CIPs. MR foam with 75 wt.% CIPs showed a higher magnetic saturation at 91.350 emu/g compared to MR foam with 35 wt.% CIPs at 63.896 emu/g. For tunable sound absorption testing, the effect of 'shifting' to higher frequency was also observed when the magnetic field was applied, which was ~10 Hz for MR foam with 35 wt.% CIPs and ~130 Hz for MR foam with 75 wt.% CIPs. As the latest evolution of semi-active noise control materials, the results from this study are valuable guidance for the advancement of MR-based devices.
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Affiliation(s)
- Noor Sahirah Muhazeli
- Engineering Materials and Structures (eMast), Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kampung Datuk Keramat, Kuala Lumpur 54100, Malaysia; (N.S.M.); (S.A.M.); (S.A.A.A.); (N.N.)
| | - Nur Azmah Nordin
- Engineering Materials and Structures (eMast), Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kampung Datuk Keramat, Kuala Lumpur 54100, Malaysia; (N.S.M.); (S.A.M.); (S.A.A.A.); (N.N.)
- Correspondence: (N.A.N.); (U.U.)
| | - Ubaid Ubaidillah
- Mechanical Engineering Department, Universitas Sebelas Maret, J1. Ir. Sutami 36A, Kentingan, Surakarta 57126, Indonesia
- Correspondence: (N.A.N.); (U.U.)
| | - Saiful Amri Mazlan
- Engineering Materials and Structures (eMast), Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kampung Datuk Keramat, Kuala Lumpur 54100, Malaysia; (N.S.M.); (S.A.M.); (S.A.A.A.); (N.N.)
- International Center, Tokyo City University, 1 Chome-28-1 Tamazutsumi, Setagaya, Tokyo 158-0087, Japan
| | - Siti Aishah Abdul Aziz
- Engineering Materials and Structures (eMast), Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kampung Datuk Keramat, Kuala Lumpur 54100, Malaysia; (N.S.M.); (S.A.M.); (S.A.A.A.); (N.N.)
| | - Nurhazimah Nazmi
- Engineering Materials and Structures (eMast), Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kampung Datuk Keramat, Kuala Lumpur 54100, Malaysia; (N.S.M.); (S.A.M.); (S.A.A.A.); (N.N.)
| | - Iwan Yahya
- Department of Physics, Universitas Sebelas Maret, J1. Ir. Sutami 36A, Kentingan, Surakarta 57126, Indonesia;
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Long H, Liu C, Shao C, Cheng Y, Chen K, Qiu X, Liu X. Subwavelength broadband sound absorber based on a composite metasurface. Sci Rep 2020; 10:13823. [PMID: 32796874 PMCID: PMC7429509 DOI: 10.1038/s41598-020-70714-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 08/03/2020] [Indexed: 11/13/2022] Open
Abstract
Suppressing broadband low-frequency sound has great scientific and engineering significance. However, normal porous acoustic materials backed by a rigid wall cannot really play its deserved role on low-frequency sound absorption. Here, we demonstrate that an ultrathin sponge coating can achieve high-efficiency absorptions if backed by a metasurface with moderate surface impedance. Such a metasurface is constructed in a wide frequency range by integrating three types of coiled space resonators. By coupling an ultrathin sponge coating with the designed metasurface, a deep-subwavelength broadband absorber with high absorptivity (\documentclass[12pt]{minimal}
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\begin{document}$$\lambda $$\end{document}λ from 17.7 to 8.5 times of thickness of the absorber) has been demonstrated theoretically and experimentally. The construction mechanism is analyzed via coupled mode theory. The study provides a practical way in constructing broadband low-frequency sound absorber.
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Affiliation(s)
- Houyou Long
- Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing, 210093, China
| | - Chen Liu
- Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing, 210093, China
| | - Chen Shao
- Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing, 210093, China
| | - Ying Cheng
- Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing, 210093, China
| | - Kai Chen
- Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing, 210093, China.
| | - Xiaojun Qiu
- Centre for Audio, Acoustics and Vibration, Faculty of Engineering and IT, University of Technology Sydney, Sydney, NSW, 2007, Australia
| | - Xiaojun Liu
- Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing, 210093, China.
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