Uncertainty determination of in situ airborne sound insulation measurements

Machimbarrena, María; Monteiro, Carolina; Pedersoli, Stefano; Johansson, Reine; Smith, Sean

doi:10.1016/j.apacoust.2014.09.018

Cited by 18 publications

(19 citation statements)

References 6 publications

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“…Some recent studies [26][27][28][29] on the uncertainty of SNQs extended to the low frequencies range show an increase in the SNQs uncertainty due to the LF extension, confirming the results found in this RRT. Mahn and Pearse [26] studied the effect on uncertainty of expanding the frequency range included in the calculation of the single number ratings, using laboratory measurements of 200 lightweight walls as data.…”

Section: Airborne Sound Insulationsupporting

confidence: 89%

Managing Measurement Uncertainty in Building Acoustics

Scrosati

Scamoni

2015

Buildings

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In general, uncertainties should preferably be determined following the principles laid down in ISO/IEC Guide 98-3, the Guide to the expression of uncertainty in measurement (GUM:1995). According to current knowledge, it seems impossible to formulate these models for the different quantities in building acoustics. Therefore, the concepts of repeatability and reproducibility are necessary to determine the uncertainty of building acoustics measurements. This study shows the uncertainty of field measurements of a lightweight wall, a heavyweight floor, a façade with a single glazing window and a façade with double glazing window that were analyzed by a Round Robin Test (RRT), conducted in a full-scale experimental building at ITC-CNR (Construction Technologies Institute of the National Research Council of Italy). The single number quantities and their uncertainties were evaluated in both narrow and enlarged range and it was shown that including or excluding the low frequencies leads to very significant differences, except in the case of the sound insulation of façades with single glazing window. The results obtained in these RRTs were compared with other results from literature, which confirm the increase of the uncertainty of single number quantities due to the low frequencies extension. Having stated the measurement uncertainty for a single measurement, in building acoustics, it is also very important to deal with sampling for the purposes of classification of buildings or building units. Therefore, this study also shows an application of the sampling included in the Italian Standard on the acoustic classification of building units on a serial type building consisting of 47 building units. It was found that the greatest variability is observed in the façade and it depends on both the great variability of window's typologies and on workmanship. Finally, it is suggested how to manage the uncertainty in building acoustics, both for one single

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Section: Airborne Sound Insulationsupporting

confidence: 89%

Managing Measurement Uncertainty in Building Acoustics

Scrosati

Scamoni

2015

Buildings

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“…The measurements where performed by Robust Details inspectors. Details of the data set can be found in [17].…”

Section: Results From a Case Studymentioning

confidence: 99%

Dealing with measurement uncertainties in building acoustics

Johansson¹,

Machimbarrena

Monteiro

et al. 2015

17th International Congress of Metrology

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L'acoustique du bâtiment est un domaine où les incertitudes ont traditionnellement été signalés comme indiqué par une norme existante, ou non déclarés du tout. Dans un monde où la performance acoustique des éléments de construction (mesurée dans des laboratoires accrédités) et la performance acoustique des solutions constructives (mesurées sur le terrain) doivent être testés et souvent jugés pour se conformer à une exigence, il est recommandé d'effectuer des calculs d'incertitude détaillés. La norme existante "ISO 12999-1: 2014 Détermination et application des incertitudes de mesure dans l'acoustique des bâtiments -Partie 1: Isolation acoustique." comprend des valeurs d'incertitude générales pour mesurandes typiques tels que l'isolation au bruit aérien et d'impact sonore dans différentes situations de mesure, à la fois pour les bandes de tiers d'octave et les valeurs uniques correspondantes. Cet article soutient l'idée de faire des calculs individuels d'incertitude non seulement pour les mesures d'isolation acoustique, mais pour toute mesure en acoustique du bâtiment. Une collection de ces calculs sont présentés pour soutenir la thèse, montrant que ce calcul de l'incertitude individuelle devient plus important lorsque les valeurs uniques sont considérées.Abstract. Building acoustics is a field where uncertainties have traditionally been reported as stated by an existing standard, or not reported at all. In a world where acoustic performance of building elements (measured in accredited laboratories) and acoustic performance of constructive solutions (measured in the field) must be tested and often judged to comply with a requirement, it is recommended to perform detailed uncertainty calculations. The existing standard "ISO 12999-1:2014 Determination and application of measurement uncertainties in building acoustics -Part 1: Sound insulation" includes general uncertainty values for typical measurands such as airborne and impact sound insulation under different measurement situations, both for third octave bands and single number quantities. This paper supports the idea of making individual uncertainty calculations not only for sound insulation measurements but for any acoustic measurement in building acoustics. A collection of such calculations are shown to support the thesis, showing that this individual uncertainty calculation becomes more important when single number quantities are considered.

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“…Uma parede de bloco de concreto tem maiores valores de isolamento sonoro aéreo do que a parede modular em placas, o que acontece devido à sua densidade (MATOSKI; RIBEIRO, 2016 Machimbarrena et al (2015) avaliaram 300 paredes internas com as mesmas condições ambientais e de entorno, divididas em paredes pesadas e leves, concluindo que o isolamento acústico pode apresentar uma dispersão bastante alta mesmo apresentando as mesmas características, sobretudo nas baixas e altas frequências. A faixa de frequência, portanto, utilizada para a avaliação afeta a incerteza do número único pra o isolamento, o Dnt,w.…”

Section: O Desempenho Acústico Das Vedações Verticaisunclassified

Contribuição do componente e da espessura no desempenho acústico de vedações verticais

Andrade

Lordsleem

Souza

et al. 2018

PARC Pesq. em Arquit. e Constr.

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ResumoO desempenho das edificações tem se tornado preocupação crescente das construtoras, tendo em vista as exigências dos usuários e a competitividade do mercado imobiliário; além da norma brasileira de desempenho de edificações habitacionais. Como uma destas exigências, pode-se citar o isolamento sonoro das vedações verticais, que causam desconforto acústico quando deficiente. O presente trabalho tem por objetivo avaliar a conformidade das vedações verticais internas e externas em campo em relação aos critérios estabelecidos pela norma brasileira de desempenho, analisando os resultados obtidos em relação ao tipo de componente e às espessuras total e do revestimento. Para tanto, foram coletados dados em 15 edifícios de múltiplos pavimentos, que utilizaram os seguintes componentes: tijolo cerâmico, bloco cerâmico, bloco de concreto ou bloco de gesso. Constatou-se que apenas 25% dos componentes avaliados estão em conformidade com a norma, no caso das vedações verticais internas. Para as vedações verticais externas, apenas 10% dos componentes avaliados estão em conformidade com o critério de classe de ruído II e nenhum com o critério de classe de ruído III. Verificou-se também que o bloco de concreto apresenta melhor desempenho para vedações internas e externas, devido ao seu comportamento mais constante na faixa de frequências de 100 a 3150 Hz. As espessuras totais e de revestimento que corresponderam ao melhor desempenho acústico, obtido na amostragem, também foram identificadas.Palavras-chave: Desempenho acústico. Isolamento acústico. Vedação vertical. Desempenho do componente. Espessuras do revestimento. Abstract The performance of the buildings has become a growing concern of the builders, considering the demands of the users and the competitiveness of the real estate market; besides the Brazilian norm of performance of residential buildings. As one of these requirements, one can cite the sound insulation of vertical fences, which cause acoustic discomfort when deficient. The objective of the present work is to evaluate the compliance of the internal and external walls in the field

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Uncertainty determination of in situ airborne sound insulation measurements

Cited by 18 publications

References 6 publications

Managing Measurement Uncertainty in Building Acoustics

Managing Measurement Uncertainty in Building Acoustics

Dealing with measurement uncertainties in building acoustics

Contribuição do componente e da espessura no desempenho acústico de vedações verticais

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