Bi-functional metamaterial based on Helmholtz resonators for sound and heat insulation

TL;DR

This study introduces a bi-functional metamaterial panel with Helmholtz resonators that effectively reduces sound and heat transfer, offering a promising solution for noise and thermal insulation in buildings.

Contribution

The paper presents a novel design of a metamaterial panel combining Helmholtz resonators for simultaneous sound and heat insulation, supported by finite element analysis.

Findings

Attenuates sound in 400 Hz to 2.5 kHz range

Provides heat protection over 24 hours

Outperforms homogeneous panels without resonators

Abstract

Over the last few decades, both heat and broadband sound reduction have become increasingly significant as a result of concerns about the environment and noise pollution. In order to address this challenge, we provide a finite element analysis study of an acoustic metamaterial panel consisting of a unit cell made of two Helmholtz Resonators with a guide in between. These panels can attenuate and control both sound propagation and heat flux. For noise pollution in a building, we first determine the geometric dimension that corresponds to the operative frequency range. Furthermore, we investigate the sound transmission loss of the proposed panel as a function of the periodicity of an array of unit cells. Additionally, we investigate the thermal flux induced by the panel, especially within a 24-hour period. The simulation results show that the proposed panel provides a level of sound attenuation within the frequency range of 400 Hz to 2.5 kHz, as well as interesting heat protection. The structure is compared to panels made up of a homogeneous medium and without Helmholtz resonators.