Abstract
When resonators are included within a material, as in metamaterials, strong scattering and absorption phenomena occur, which can be used to design sound absorbers. Such phenomena have been explored to create very low-thickness, sub-wavelength absorbing structures. Using metamaterials, degenerate modes can be generated, for example, in a slotted rigid material with embedded resonators, and each degenerate mode is composed of two resonances: one monopolar and one dipolar. In this situation, the transmission and reflection in the structure can be reduced, thus achieving perfect absorption of the incident sound wave at that frequency. However, this behavior is usually observed at selected frequencies, and it becomes difficult to design a highly-porous and ventilated absorbing material exhibiting this behavior over a broad bandwidth, for example, for noise control applications in acoustic engineering.
BibTeX citation
@inproceedings{MateoEuromech2022,
author = {Noé Jiménez and Diana Andrés and Sergio Jiménez-Gambín and Antonios N. Pouliopoulos and José M. Benlloch and Jonathan Vappou and Elisa E. Konofagou and Alicia Carrión-García and Francisco Camarena},
booktitle = {EUROMECH Colloquium 610. Emerging topics in acoustic and mechanical metamaterials. Benicassim, Spain. 25-27 April},
doi = {https://euromech.org/colloquia/2021/610},
editor = {Conference proceedings},
month = {4},
organization = {European Mechanics Society},
pages = {41-42},
series = {Poster},
title = {Tortuous metamaterial for perfect sound absorption in transmission},
url = {https://euromech.org/colloquia/2021/610},
year = {2022}
}