Multiresonant Layered Acoustic Metamaterial (MLAM) solution for broadband low-frequency noise attenuation through double-peak sound transmission loss response

TL;DR

This paper introduces the MLAM, a layered acoustic metamaterial that achieves broadband low-frequency noise attenuation with a double-peak sound transmission loss, addressing manufacturing complexity and narrow bandwidth issues of previous solutions.

Contribution

The paper presents the MLAM concept, a novel layered metamaterial design utilizing coupled resonances for enhanced broadband low-frequency noise attenuation.

Findings

Achieves double-peak sound transmission loss response.

Suitable for large-scale manufacturing.

Provides broadband low-frequency noise attenuation.

Abstract

The problem of noise control and attenuation is of interest in a broad range of applications, especially in the low-frequency range, below 1000 Hz. Acoustic metamaterials allow us to tackle this problem with solutions that do not necessarily rely on high amounts of mass, however most of them still present two major challenges: they rely on complex structures making them difficult to manufacture, and their attenuating capabilities are limited to narrow frequency bandwidths. Here we propose the Multiresonant Layered Acoustic Metamaterial (MLAM) concept as a novel kind of acoustic metamaterial based on coupled resonances mechanisms. Their main advantages hinge on providing enhanced sound attenuation capabilities in terms of a double-peak sound transmission loss response by means of a layered configuration suitable for large scale manufacturing.