Results 141 to 150 of about 2,450 (178)

Metamaterials acoustic barrier

Applied Acoustics, 2021
Abstract Metamaterials represent a new technology in noise control fields. The first studies about metamaterials date back to the 1900s. The ability to deflect acoustic waves is due to the geometric of the structures that generate resonance effects, and to the periodic arrangement within the material.
Iannace G., Ciaburro G., Trematerra A.
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The 2024 acoustic metamaterials roadmap [PDF]

Journal of Physics D: Applied Physics
Abstract Today, acoustic metamaterials (AMMs) form a core area of metamaterial research. They offer bespoke wave control, achievable through their rationally designed structure and are at the forefront of metamaterial applications and commercialisation.
Gregory James Chaplain, Felix Langfeldt, Vicent Romero-García, Noé Jiménez, Yang Meng, Jean-Philippe Groby, Vincent Pagneux, Daniel Moore, Alastair P Hibbins, J Roy Sambles, Timothy Starkey, Bogdan-Ioan Popa, Zhiwang Zhang, Johan Christensen, Xinhua Wen, Jensen Li, Romain Fleury, Samuel Wallen, Michael R. Haberman, Charles Galluscio, Shishir Damani, Nathan Alexander, William Devenport, Mahmoud I Hussein, Gianluca Memoli, Gioia Fusaro, Dario D'Orazio, Luca Barbaresi, Massimo Garai, Letizia Chisari, Prateek Mittal, QI ZHU, Sriram Subramanian, Stephane BRULE, Stefan Enoch, Sebastien Guenneau, Rachel Stoakes, Conor McLean and Alicia Gardiner   +37 more
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A multilayered acoustic hyperlens with acoustic metamaterials

Applied Physics A, 2011
The acoustic hyperlens can be realized by an alternating layered structure of water and fluid with negative mass density. Based on this alternating layered principle, we propose that an acoustic metamaterial consisting of three layers in water background can be designed to replace the fluid with negative mass density.
Tzeh-Yi Chiang, Liang-Yu Wu, Chia-Nien Tsai, Lien-Wen Chen   +3 more
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New acoustics, based on metamaterial

The Journal of the Acoustical Society of America, 2012
With the capability to fabricate acoustical metamaterial:phononic crystals, double negative material and materials with material parameters based on the predetermined direction of sound propagation, one can control and manipulate sound propagation in solids and fluids.
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'Maxwellian' macroscopic acoustics and acoustic metamaterials

The Journal of the Acoustical Society of America, 2008
For electromagnetic wave propagation it was found that there exist composite media exhibiting strong spatial dispersion. This has raised the question of the relevance of the spatial dispersion in the characterization of the new metamaterials. The present communication intends to show that exactly the same problematic occurs in acoustics when ...
Denis Lafarge, Aroune Duclos
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Effective Parameters of Acoustic Metamaterials

Russian Physics Journal, 2018
Analytical expressions are presented for the wave number, the characteristic wave impedance, and the refractive index of homogeneous longitudinal plane waves propagating in an acoustic metamaterial with dissipative losses. The metamaterial is characterized by the effective scalar material parameters: the complex density and the compressibility.
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Acoustic Metamaterials

2023
Bo Song, Aiguo Zhao, Yusheng Shi
  +4 more sources

Acoustic conjugate metamaterials

Physical Review B, 2019
Compared to metamaterials based on regulation of real material parameters, artificial materials designed by controlling complex parameters exhibit richer physics and different functions. In this work, we present acoustic conjugate metamaterials, which possess complex mass densities and bulk compressibilities with opposite phases, to manipulate acoustic
Liang Chen, Li Fan, Shu-yi Zhang
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Soft Acoustic Metamaterials

Science, 2013
Soft materials that embed small resonators in a host material can dampen or focus sound.
Brunet, Thomas, Leng, Jacques, Mondain-Monval, Olivier   +2 more
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Bubbly Acoustic Metamaterials

2021
Bubbly metamaterials are created by exploiting the low-frequency Minnaert resonance of bubbles, and can radically modify acoustic wave behaviour. In this presentation, I will first review the properties of bubble metascreens, which consist of a single layer of bubbles in a soft solid, and can be very efficient absorbers of waterborne acoustic waves ...
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