The Uncertainty of the Proposed Single Number Ratings for Airborne Sound Insulation

Mahn, Jeffrey; Pearse, John

doi:10.1260/1351-010x.19.3.145

Cited by 25 publications

(25 citation statements)

References 13 publications

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“…Recently, a replacement for ISO 717-1, designated as ISO 16717-1 [7], has been proposed [8], which includes changes to the frequency range included in the single number ratings [9,10]. However, no evaluation has been introduced into the proposed new standard that classifies hearing sensation.…”

Section: Introductionmentioning

confidence: 99%

Airborne sound insulation in terms of a loudness model

Neubauer

Kang

2014

Applied Acoustics

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A B S T R A C TOne of the main goals of building acoustics is the prediction of airborne sound insulation between rooms to determine the quality of sound protection. In many practical cases, however, the objective measures of the airborne sound insulation using procedures in standards are not in agreement with the subjective assessment. This paper, therefore, after reviewing the conventional model to calculate airborne sound insulation, introduces a calculation scheme based on loudness level linked with specific fluctuation strength, yielding a weighted normalised loudness level difference, L nor,w . By analysing the difference between standard airborne sound insulation values and the introduced weighted normalised loudness level difference, it is revealed that the sound pressure level that is transmitted through a partition decreases with increasing frequency, and this is independent of the type of signal and of the airborne sound insulation values (R' w -values), whereas if the transmitted signal is converted into a loudness level, it tends to rise with increasing frequency. Moreover, it is found that, whereas a simple level difference does not exhibit the effect of a given signal to the frequency-dependent airborne sound insulation curve, using L nor,w , a significant change can be observed, in terms of both computed and measured results. Furthermore, the frequency-dependent results allow more details to be investigated for a certain sound insulation. A comparison between the measured and predicted airborne sound insulation with no obvious malfunction suggests that at some frequency ranges, a hypothetical subjective related failure might occur. Overall, the proposed L nor,w could reveal detailed insights into the in situ measured airborne sound insulation compared with standard airborne sound insulation values. The frequency-dependent values discussed in this paper form a basis for developing a single-number index.

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Section: Introductionmentioning

confidence: 99%

Airborne sound insulation in terms of a loudness model

Neubauer

Kang

2014

Applied Acoustics

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“…It has been assumed that DnTA has a Gaussian distribution, which could be discussed [22,23], and a coverage factor k = 1.7 which corresponds to approximately 95% confidence level for a cumulative distribution (single sided) has been used.…”

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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“…Conducted in previous research (Mahn, Pearse 2012;Janusevicius et al 2016;Yu et al 2017), the noise control is calculated through analysis of Area of the aperture from Sound Reduction Index (SRI) of building material and opened aperture (developed from De Salis et al (2002), see Equation (4)). The setting for WWR analysis considers distance important factor on noise propagation, different distance source to receiver effects on the maximum of WWR.…”

Section: Recommendation For Thermoacoustic Improvementmentioning

confidence: 99%

Analysis of Resilient Design by Thermoacoustic Adaptation of Tropical Urban Model

Samodra

2017

Journal of Architecture and Urbanism

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Abstract. Climate and urban environment changes lead to tropical building adaptation and resilient strategy. They focus especially on thermal comfort and noise propagation variation as the result of global warming and urban growth. This study analyzes a conceptual design of tropical urban model on integrated design of thermal and acoustic (thermoacoustic) issues. By experimental measurement and simulation method using Computational Fluid Dynamics, the findings are directed to meet the standards and to recommend the new guidelines for sustainable urban building. The research location is in Surabaya as the urban tropical lowland area and EcoHouse of ITS, a tropical building model in an urban environment, was built as experiment model. The results highlighted that the noise barrier should consider 5.24% of the maximum window to wall ratio (WWR) in tree dimensionally analysis, horizontally and vertically. Providing vertical ventilation is the best solution for urban density, but the orientation and its flanking noise affect the passive cooling. In general, there are some factors having a high contribution in addition to WWR, such as wind acceleration, the distance, and building material.

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The Uncertainty of the Proposed Single Number Ratings for Airborne Sound Insulation

Cited by 25 publications

References 13 publications

Airborne sound insulation in terms of a loudness model

Airborne sound insulation in terms of a loudness model

Dealing with measurement uncertainties in building acoustics

Analysis of Resilient Design by Thermoacoustic Adaptation of Tropical Urban Model

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