@article {Aberkane-Gauthier:2021:0736-2935:2296,
title = "Phononic crystal sandwich for broadband and low frequency acoustic insulation under diffuse field",
journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings",
parent_itemid = "infobike://ince/incecp",
publishercode ="ince",
year = "2021",
volume = "263",
number = "4",
publication date ="2021-08-01T00:00:00",
pages = "2296-2303",
itemtype = "ARTICLE",
issn = "0736-2935",
url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2021/00000263/00000004/art00037",
doi = "doi:10.3397/IN-2021-2098",
author = "Aberkane-Gauthier, Natacha and Moler{\‘o}n, Miguel and Lecoq, Damien and Lagarrigue, Cl{\’e}ment and P{\’e}zerat, Charles and Romero-Garc{\’ı}a, Vincente",
abstract = "Light and thin structures exhibiting high sound insulation over a wide frequency range are a major industrial concern, especially in the transport and building sectors. Phononic crystals constitute promising solutions to solve this issue due to their particular dispersion properties.
In this work, we build a system consisting of a well-known sandwich panel comprising a soft elastic core layer hosting periodically arranged rigid inclusions. Diffuse field measurements show a huge improvement of the Transmission Loss compared to the system without inclusions. In fact, for
this kind of panel, the structured core enables Bragg band-gap opening for guided slow propagating waves leading to low frequency and broadband enhancement of the Transmission Loss. Using a 3cm-thick material we are able to improve the response from 300 Hz on (/38 in air). We then
develop a finite elements model to achieve a precise description and understanding of the problem. We also propose a numerical tool to analyze the system's band-structures from a vibroacoustic point of view. It proves very useful for the further development of practical solutions.",
}