Numerical Investigation of the Repeatability and Reproducibility of Laboratory Sound Insulation Measurements

Dijckmans, Arne; Vermeir, Gerrit

doi:10.3813/aaa.918623

Cited by 21 publications

(14 citation statements)

References 22 publications

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“…It was demonstrated that the uncertainties of lightweight samples are lower than the uncertainties of heavy types of construction; therefore it will be important for datasets of different constructions to be considered separately. A similar difference between the uncertainty of heavy and lightweight test samples was shown by Dijckmans and Vermeir [23] who made a numerical investigation of the repeatability and reproducibility of laboratory sound insulation measurements by investigating both the pressure method and the intensity method. Dijckmans and Vermeir [23] found that for large, heavy test elements, like concrete walls, the reproducibility in the lowest frequency bands is not improved by using the intensity method, while, for double plasterboard walls, the theoretical uncertainty is decreased by 1 dB by using the intensity method.…”

Section: Airborne Sound Insulationsupporting

confidence: 63%

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: 63%

Managing Measurement Uncertainty in Building Acoustics

Scrosati

Scamoni

2015

Buildings

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“…Parts of this study have been published in previous papers. 15,16 These studies formed the basis of the present research.…”

Section: Introductionmentioning

confidence: 88%

The repeatability and reproducibility of laboratory building acoustic measurements: Numerical study

Dijckmans¹,

Geetere²,

Ingelaere³

2017

Proceedings of Meetings on Acoustics

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“…Even above the Schroeder frequency, the pressure field is not perfectly homogeneous and the lack of grazing incidence plane waves has been pointed out in the literature. Inter-laboratory variations of vibroacoustic measurements in reverberant rooms can be attributed to these phenomena, but other parameters are involved such as room dimensions, niche effects, panel mounting conditions, aperture size and measuring protocols [5] [6] [7].…”

Section: Introductionmentioning

confidence: 99%

Vibroacoustic response of panels under diffuse acoustic field excitation from sensitivity functions and reciprocity principles

Marchetto

Maxit

Robin

et al. 2017

The Journal of the Acoustical Society of America

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This paper aims at developing an experimental method to characterize the vibroacoustic response of a panel to a diffuse acoustic field (DAF) excitation with a different laboratory setup than those used in standards (i.e., coupled rooms). The proposed methodology is based on a theoretical model of the DAF and on the measurement of the panel's sensitivity functions, which characterize its vibroacoustic response to wall plane waves. These functions can be estimated experimentally using variations of the reciprocity principle, which are described in the present paper. These principles can either be applied for characterizing the structural response by exciting the panel with a normal force at the point of interest or for characterizing the acoustic response (radiated pressure, acoustic intensity) by exciting the panel with a monopole and a dipole source. For both applications, the validity of the proposed approach is numerically and experimentally verified on a test case composed of a baffled simply supported plate. An implementation for estimating the sound transmission loss of the plate is finally proposed. The results are discussed and compared with measurements performed in a coupled anechoic-reverberant room facility following standards.

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Numerical Investigation of the Repeatability and Reproducibility of Laboratory Sound Insulation Measurements

Cited by 21 publications

References 22 publications

Managing Measurement Uncertainty in Building Acoustics

Managing Measurement Uncertainty in Building Acoustics

The repeatability and reproducibility of laboratory building acoustic measurements: Numerical study

Vibroacoustic response of panels under diffuse acoustic field excitation from sensitivity functions and reciprocity principles

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