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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
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
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10307 - Acoustics

Project
<a href="/en/project/EF16_027%2F0008465" target="_blank" >EF16_027/0008465: International Mobility of Researchers in CTU</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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