On the use of dynamic vibration absorbers to counteract the loss of sound insulation due to mass-spring-mass resonance effects in external thermal insulation composite systems

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F21%3A00357057" target="_blank" >RIV/68407700:21230/21:00357057 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.apacoust.2021.107999" target="_blank" >https://doi.org/10.1016/j.apacoust.2021.107999</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apacoust.2021.107999" target="_blank" >10.1016/j.apacoust.2021.107999</a>

Jazyk výsledku

angličtina

Název v původním jazyce

On the use of dynamic vibration absorbers to counteract the loss of sound insulation due to mass-spring-mass resonance effects in external thermal insulation composite systems

Popis výsledku v původním jazyce

One of the common ways to increase the energy performance of existing buildings is to add a thermal insulation layer to their facade elements, which in turn is covered by a thin protecting cement plaster. Such an arrangement is commonly known as External Thermal Insulation Composite System (ETICS). This article studies the effect of an ETICS implementation induced mechanical resonance mechanism, which results in a loss of performance in the sound insulation spectrum. A mitigating approach is proposed, which is based on an array of dynamic vibration absorbers that were designed to counteract the decrease of the sound reduction index. Using a wavenumber domain approach combined with unit cell FEM-modelling employing Bloch-Floquet boundary conditions, numerical predictions are presented for the sound reduction index. A number of different dynamic vibration absorber designs were tested on a silicate cement brick wall in a transmission loss facility. The predictions are in good agreement with experimental data obtained by classical, microphone based acoustic isolation measurements and laser Doppler vibrometry. (C) 2021 Elsevier Ltd. All rights reserved.

Název v anglickém jazyce

On the use of dynamic vibration absorbers to counteract the loss of sound insulation due to mass-spring-mass resonance effects in external thermal insulation composite systems

Popis výsledku anglicky

One of the common ways to increase the energy performance of existing buildings is to add a thermal insulation layer to their facade elements, which in turn is covered by a thin protecting cement plaster. Such an arrangement is commonly known as External Thermal Insulation Composite System (ETICS). This article studies the effect of an ETICS implementation induced mechanical resonance mechanism, which results in a loss of performance in the sound insulation spectrum. A mitigating approach is proposed, which is based on an array of dynamic vibration absorbers that were designed to counteract the decrease of the sound reduction index. Using a wavenumber domain approach combined with unit cell FEM-modelling employing Bloch-Floquet boundary conditions, numerical predictions are presented for the sound reduction index. A number of different dynamic vibration absorber designs were tested on a silicate cement brick wall in a transmission loss facility. The predictions are in good agreement with experimental data obtained by classical, microphone based acoustic isolation measurements and laser Doppler vibrometry. (C) 2021 Elsevier Ltd. All rights reserved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10307 - Acoustics

Projekt

<a href="/cs/project/EF16_027%2F0008465" target="_blank" >EF16_027/0008465: Mezinárodní mobility výzkumných pracovníků ČVUT</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Acoustics

ISSN

0003-682X

e-ISSN

1872-910X

Svazek periodika

178

Číslo periodika v rámci svazku

107999

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

23

Strana od-do

—

Kód UT WoS článku

000640183600034

EID výsledku v databázi Scopus

2-s2.0-85102348977