Minimizing Indoor Sound Energy with Tunable Metamaterial Surfaces

Qu, Sichao; Sheng, Ping

doi:10.1103/physrevapplied.14.034060

Cited by 14 publications

(11 citation statements)

References 21 publications

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“…The physical phenomena of waves are closely linked to the ratio between the wavelength and the size of the structure, usually denoted the scaling factor ( 34 ). For instance, if the dimensions of the ring structure are uniformly scaled by α (<1), while the material properties (e.g., the resistance, dielectric constant of the substrate) are kept unchanged, the operating band can be extended to a higher frequency range, that is, from 3.6/ α -9/ α GHz.…”

Section: Resultsmentioning

confidence: 99%

“…In our case, the overall thickness of the absorber is 14.2 mm, only 5% over the minimum thickness dictated by the causality limit. This theoretical limit also plays a crucial role in the impedance design of the acoustic ( 34 – 38 ) and microwave transmission line network systems ( 6 , 39 , 40 ). The causal optimality of broadband metamaterial absorber has been reported in acoustic systems ( 35 , 36 ).…”

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confidence: 99%

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Conceptual-based design of an ultrabroadband microwave metamaterial absorber

Hou

Sheng

2021

Proc. Natl. Acad. Sci. U.S.A.

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By introducing metallic ring structural dipole resonances in the microwave regime, we have designed and realized a metamaterial absorber with hierarchical structures that can display an averaged −19.4 dB reflection loss (∼99% absorption) from 3 to 40 GHz. The measured performance is independent of the polarizations of the incident wave at normal incidence, while absorption at oblique incidence remains considerably effective up to 45°. We provide a conceptual basis for our absorber design based on the capacitive-coupled electrical dipole resonances in the lateral plane, coupled to the standing wave along the incident wave direction. To realize broadband impedance matching, resistive dissipation of the metallic ring is optimally tuned by using the approach of dispersion engineering. To further extend the absorption spectrum to an ultrabroadband range, we employ a double-layer self-similar structure in conjunction with the absorption of the diffracted waves at the higher end of the frequency spectrum. The overall thickness of the final sample is 14.2 mm, only 5% over the theoretical minimum thickness dictated by the causality limit.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Conceptual-based design of an ultrabroadband microwave metamaterial absorber

Hou

Sheng

2021

Proc. Natl. Acad. Sci. U.S.A.

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“…Self-Similar Hierarchical Structures. The physical phenomena of waves are closely linked to the ratio between the wavelength and the size of the structure, usually denoted the scaling factor (34). For instance, if the dimensions of the ring structure are uniformly scaled by α (<1), while the material properties (e.g., the resistance, dielectric constant of the substrate) are kept unchanged, the operating band can be extended to a higher frequency range, that is, from 3.6/α-9/α GHz.…”

Section: Resultsmentioning

confidence: 99%

“…In our case, the overall thickness of the absorber is 14.2 mm, only 5% over the minimum thickness dictated by the causality limit. This theoretical limit also plays a crucial role in the impedance design of the acoustic (34)(35)(36)(37)(38) and microwave transmission line network systems (6,39,40). The causal optimality of broadband metamaterial absorber has been reported in acoustic systems (35,36).…”

mentioning

confidence: 99%

Conceptual-based design of ultra-broadband microwave metamaterial absorber

Sheng

2021

Preprint

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“…Studies have been discussed using acoustic metamaterial to control sound transmission by absorbing low-frequency sound in linear and nonlinear regions [1,2] and doping impurities inside zero-index metamaterial [3]. Also, the method for minimizing indoor sound energy by using an acoustic metamaterial with a flat panel structure [4] and the method for detecting an acoustic image by constructing an acoustic superlens using membrane-based a two-dimensional metamaterial having a negative density were reported [5]. In addition, a non-resonant metasurface design for broadband elastic wave mode division that be used for elastic communication and biomedical diagnostic evaluation has also been proposed [6].…”

Section: Introductionmentioning

confidence: 99%

Influence of geometric structure, convection, and eddy on sound propagation in acoustic metamaterial with turbulent flow

Pak,

Kim,

Pak

et al. 2020

Preprint

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The problem of reducing noise in the transportation is an important research field to prevent accidents and to provide a civilized environment for people. A material that has recently attracted attention in research to reduce noise is acoustic metamaterial, and most of the research projects so far have been limited to the case of static media without flow. We have studied the sound transmission properties of acoustic metamaterial with turbulent flow to develop acoustic metamaterial that be used in transportation. In this paper, the effect of geometrical structure, the convective effect, and the eddy effect on sound propagation in acoustic metamaterial with turbulent flow are investigated, and the relationships between them are analyzed. The convective effect and the eddy effect both reduce the resonant strength of sound transmission loss resulting from the unique geometry of the acoustic crystal, but shift the resonant frequencies in opposite directions. In addition, when the convective effect and the eddy effect of the airflow, as well as the intrinsic interaction effect generated from the unique geometrical structure of the acoustic metamaterial cannot be ignored, they exhibit competition phenomena with each other, resulting in a widening of the resonance peak. As a result, these three effects cause the shift of the resonance frequency of the sound transmission loss and the widening of the resonance peak. The results of this study show that even in the case of turbulent flow, acoustic metamaterial can be used for transportation by properly controlling the geometric size and shape of the acoustic metamaterial.

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Minimizing Indoor Sound Energy with Tunable Metamaterial Surfaces

Cited by 14 publications

References 21 publications

Conceptual-based design of an ultrabroadband microwave metamaterial absorber

Conceptual-based design of an ultrabroadband microwave metamaterial absorber

Conceptual-based design of ultra-broadband microwave metamaterial absorber

Influence of geometric structure, convection, and eddy on sound propagation in acoustic metamaterial with turbulent flow

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