scholarly journals Lightweight ventilated façade: Acoustic performance in laboratory conditions, analysing the impact of controlled ventilation variations on airborne sound insulation

2020 ◽  
Vol 27 (4) ◽  
pp. 367-379
Author(s):  
Joan Lluis Zamora Mestre ◽  
Andrea Niampira
Keyword(s):  
Sound Insulation ◽  
Air Cavity ◽  
Acoustic Performance ◽  
Controlled Ventilation ◽  
Laboratory Conditions ◽  
Airborne Sound ◽  
Cavity Thickness ◽  
Ventilated Facade ◽  
The Impact ◽  
Real Building

The use of double-sheet enclosures with an intermediate non-ventilated air cavity guarantees a higher airborne sound insulation. The insulation advantages depend on air tightness and the placement of sound absorbing material in the air cavity. The lightweight ventilated façade is a system constructed by the addition of an external light cladding on a heavy single wall to establish an intermediate air cavity. This air cavity can be ventilated under controlled cooling effects, because of Sun’s radiation, and to reduce the risk of dampness caused by rainwater. Owing to this ventilation, acoustic insulation of the lightweight ventilated façade could be less effective. However, some authors indicate that air cavity moderate ventilation does not necessarily lead to a significant reduction in the airborne sound insulation. The authors previously verified this situation in a real building where the existing façade of masonry walls was transformed into a lightweight ventilated façade. The preliminary results indicate the acoustic benefits can be compatible with the hygrothermal benefits derived from controlled ventilation. This article presents the next step, the evaluation of the lightweight ventilated façade acoustic performance under laboratory conditions to revalidate the previous results and refining aspects as the air cavity thickness or the state of openings ventilation. The main results obtained indicate that the airborne sound insulation in laboratory is aligned with the previous results in a real building. Air cavity thickness from 110 to 175 mm and ventilation openings from 0% to 3.84% of the façade area does not lead to a significant reduction in the airborne sound insulation.

scholarly journals Proposal of an Assessment Method of the Impact Sound Insulation of Lightweight Floors

Buildings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 13
Author(s):  
Łukasz Nowotny ◽  
Jacek Nurzyński
Keyword(s):  
Sound Pressure ◽  
Residential Buildings ◽  
Assessment Method ◽  
Sustainable Construction ◽  
Sound Insulation ◽  
Indicator Values ◽  
Floor Covering ◽  
Acoustic Performance ◽  
Quality Rating ◽  
The Impact

Lightweight floors are in line with a sustainable construction concept and have become increasingly popular in residential buildings. The acoustic performance of such floors plays a pivotal role in the overall building quality rating. There is, however, no clear and complete method to predict their impact sound insulation. A new approximation method and new acoustic indicators—equivalent weighted normalized impact sound pressure levels for lightweight floors—are proposed and outlined in this article. The prediction procedure and indicator values were initially validated on the basis of laboratory measurements taken for different lightweight floors with the same well-defined floor covering. These preliminary analyses and comparisons show that the proposed method is promising and should be fully developed on the basis of further research.

Impact sound transmission: experiments of control at the receiver room

2021 ◽  
Vol 263 (1) ◽  
pp. 5595-5599
Author(s):  
Davi Akkerman ◽  
Paola Weitbrecht ◽  
Mariana Shieko ◽  
Marcel Borin ◽  
Leonardo Jacomussi
Keyword(s):  
Social Housing ◽  
Sound Transmission ◽  
Field Tests ◽  
Sound Level ◽  
Sound Insulation ◽  
Total Cost ◽  
Acoustic Performance ◽  
The Impact ◽  
Insulation Performance

Considering Impact sound level requirements accomplishment in Brazil, floating floors are still considered as an inviable solution for building companies due to the implications in the total cost of building, mainly for social housing. Alternative and sometimes cheaper solutions are those undertaken in the receiver room. However, the lack of laboratory and field tests on the acoustic performance of this type of system is still a barrier for acoustic designing in Brazil. The aim of this paper is to study and validate different constructive solutions developed jointly with building companies for improving the impact sound insulation performance on the receiving room of new Brazilian housing constructions.

scholarly journals ANÁLISE DO DESEMPENHO ACÚSTICO DE FACHADAS VENTILADAS DE PORCELANATO À LUZ DA NORMA DE DESEMPENHO: ESTUDO DE CASO EM UM EDIFÍCIO HABITACIONAL EM BRASÍLIA-DF

2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Vamberto Machado dos Santos Filho ◽  
Rosa Maria Sposto ◽  
Lucas Rosse Caldas
Keyword(s):  
Residential Building ◽  
Performance Standard ◽  
Sound Insulation ◽  
Model Design ◽  
Acoustic Performance ◽  
Building Model ◽  
Isolation Index ◽  
New Construction ◽  
And Performance ◽  
Ventilated Facade

RESUMO: A entrada de novos sistemas construtivos no mercado brasileiro tem sido acompanhada de diversos questionamentos sobre o seu desempenho. Entre estes novos sistemas estão as fachadas ventiladas, que surgem com o apelo de um sistema com o potencial de melhorar os aspectos de habitabilidade da edificação. Neste trabalho foi realizado um estudo de desempenho acústico de fachadas ventiladas com porcelanato (FVPo), comparativamente às fachadas de porcelanato aderido (FPoA). Para isto, foi utilizado um projeto de uma edificação habitacional modelo (EHM) para reproduzir as edificações típicas do Plano Piloto de Brasília-DF. Para os cálculos foi utilizado o software Insul e os critérios da norma de desempenho, a NBR 15575 (ABNT, 2013). Para cada critério da norma, os dois sistemas foram comparados e analisados com base nos resultados obtidos na simulação. Os dois sistemas apresentaram o mesmo índice de isolamento sonoro, com um nível mínimo de desempenho. Foi possível verificar a importância da esquadria no isolamento do sistema de fachada, pois ao aumentar a área da esquadria, o índice de isolamento diminui. Este trabalho traz como principal contribuição a avaliação de desempenho acústico para sistemas inovadores no setor brasileiro de edificações. 
 
 ABSTRACT: The insertion of new construction systems in the Brazilian market has been accompanied by many questions about its performance. Among these new systems there is the ventilated façades, which has the potential to improve aspects of building habitability. In this paper, the acoustic performance of a porcelain ventilated façade (FVPo) was compared to a joined porcelain façade (FPoA). A residential building model design (EHM) was used to reproduce the typical buildings of Brasilia-DF. The software Insul and performance standard criteria, in the NBR 15575 (ABNT, 2013), was used to calculate the values. For each criteria of the performance standard, the two systems were compared and analyzed based on the results of the simulation. Both systems presented the same sound insulation index, attending the minimum level of the performance standard. It was possible to verify the importance of the windows in the isolation of the façade system, because when the window frame area increases, the is a decrease of the system isolation index. The main contribution of this paper was the acoustic performance evaluation of innovative systems in the Brazilian building sector.

A Sound Insulation Prediction Model for Floor Structures in Wooden Buildings Using Neural Networks Approach

2021 ◽  
Vol 263 (2) ◽  
pp. 4166-4176
Author(s):  
Mohamad Bader Eddin ◽  
Sylvain Menard ◽  
Delphine Bard ◽  
Jean-Luc Kouyoumji ◽  
Nikolas-Georgios Vardaxis
Keyword(s):  
Neural Networks ◽  
Prediction Model ◽  
Large Error ◽  
Design Stage ◽  
Sound Insulation ◽  
Low Frequencies ◽  
Airborne Sound ◽  
Initial Stage ◽  
Building Acoustics ◽  
The Impact

Recently, machine learning and its applications have gained a large attraction in different fields. Accurate predictions in building acoustics is vital especially in the design stage. This paper presents a sound insulation prediction model based on Artificial Neural Networks (ANNs) to estimate acoustic performance for airborne and impact sound insulation of floor structures. At an initial stage, the prediction model was developed and tested for a small amount of data, specifically 67 measurement curves in one third octave bands. The results indicate that the model can predict the weighted airborne sound insulation for various floors with an error around 1 dB, while the accuracy decreases for the impact sound especially for complex floor configurations due to large error deviations in high frequency bands between the real and estimated values. The model also shows a very good accuracy in predicting the airborne and impact sound insulation curves in the low frequencies, which are of higher interest usually in building acoustics. Keywords: building acoustics, airborne sound, impact sound, prediction model, neural networks

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