Slow sound propagation in lossy locally resonant periodic structures
TLDR
In this article, the authors investigate the sound propagation in an air-filled tube periodically loaded with Helmholtz resonators and study the efficiency of slow sound propagation under the presence of the intrinsic viscothermal losses of the system.Abstract:
We investigate the sound propagation in an air-filled tube periodically loaded with Helmholtz resonators. By tuning the Helmholtz with the Bragg resonance, we study the efficiency of slow sound propagation in the presence of the intrinsic viscothermal losses of the system. While in the lossless case the overlapping of the resonances results in slow sound induced transparency of a narrow frequency band surrounded by a strong and broadband gap, the inclusion of the unavoidable losses imposes limits to the slowdown factor and the maximum transmission. Experiments, theory and finite element simulations have been used for the characterization of acoustic wave propagation. Experiments, in good agreement with the lossy theory, reveal the possibility of slowing sound at low frequencies by 20 times. A trade-off among the relevant parameters (delay time, maximum transmission, bandwidth) as a function of the tuning between Bragg and Helmholtz resonance frequency is also presented.read more
Citations
More filters
Journal ArticleDOI
Ultra-thin metamaterial for perfect and quasi-omnidirectional sound absorption
TL;DR: Using the concepts of slow sound and critical coupling, an ultra-thin acoustic metamaterial panel for perfect and quasi-omnidirectional absorption is theoretically and experimentally conceived in this paper.
Journal ArticleDOI
Rainbow-trapping absorbers: Broadband, perfect and asymmetric sound absorption by subwavelength panels for transmission problems
TL;DR: This work reports quasi-perfect sound absorption over almost two frequency octaves ranging from 300 to 1000 Hz for a panel composed of 9 resonators with a total thickness of 11 cm, i.e., 10 times smaller than the wavelength at 300 Hz.
Journal ArticleDOI
Perfect and broadband acoustic absorption by critically coupled sub-wavelength resonators
Vicent Romero-García,Georgios Theocharis,Olivier Richoux,Aurélien Merkel,Vincent Tournat,Vincent Pagneux +5 more
TL;DR: The reported concepts and methodology provide guidelines for the design of broadband perfect absorbers which could contribute to solve the major issue of noise reduction.
Journal ArticleDOI
Ultra-thin metamaterial for perfect and omnidirectional sound absorption
TL;DR: In this article, an ultra-thin acoustic metamaterial panel for perfect and omnidirectional absorption is theoretically and experimentally conceived in a system made of a rigid panel with a periodic distribution of thin closed slits, the upper wall of which is loaded by Helmholtz Resonators.
Journal ArticleDOI
Control of acoustic absorption in one-dimensional scattering by resonant scatterers
TL;DR: In this article, the authors experimentally report perfect acoustic absorption through the interplay of the inherent losses and transparent modes with high Q factor generated in a two-port, one-dimensional waveguide, which is sideloaded by isolated resonators of moderate Q factor.
References
More filters
Journal ArticleDOI
Locally Resonant Sonic Materials
TL;DR: In this article, a 2-centimeter slab of this composite material is shown to break the conventional mass-density law of sound transmission by one or more orders of magnitude at 400 hertz.
Journal ArticleDOI
Slow light in photonic crystals
TL;DR: In this article, the background theory of slow light, as well as an overview of recent experimental demonstrations based on photonic-band engineering are reviewed, and practical issues related to real devices and their applications are also discussed.
Journal ArticleDOI
Ultrasonic metamaterials with negative modulus
Nicholas X. Fang,Dongjuan Xi,Jianyi Xu,Muralidhar Ambati,Werayut Srituravanich,Cheng Sun,Xiang Zhang +6 more
TL;DR: A new class of ultrasonic metamaterials consisting of an array of subwavelength Helmholtz resonators with designed acoustic inductance and capacitance with an effective dynamic modulus with negative values near the resonance frequency is reported.
Journal ArticleDOI
‘Trapped rainbow’ storage of light in metamaterials
TL;DR: It is demonstrated theoretically that an axially varying heterostructure with a metamaterial core of negative refractive index can be used to efficiently and coherently bring light to a complete standstill, and allows for high in-coupling efficiencies and broadband, room-temperature operation.
BookDOI
Acoustic metamaterials and phononic crystals
TL;DR: In this paper, the authors introduce one-dimensional and two-dimensional (2D-3D) phononic band structures and transmission coefficients, and propose methods and approaches for constructing them.