Sound transmission loss of glass and windows in laboratories with different room design

Cops, A.; Soubrier, D.

doi:10.1016/0003-682x(88)90061-8

Cited by 10 publications

(11 citation statements)

References 6 publications

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“…Recently, the standards related to the pressure method were updated [13,14,15]. Pedersen et al [1] proposed a new intensity method to improve the repeatability and reproducibility at low frequencies (50-160 Hz), which was incorporated in ISO between the pressure method and the classical intensity method according to ISO 15186-1 [9] have been discussed by several authors [22,23,24,25]. The intensity method typically yielded lower sound insulation values at the low frequencies than the pressure method, which can be partly explained by the Waterhouse correction [26].…”

Section: Introductionmentioning

confidence: 99%

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

Dijckmans

Vermeir²

2013

Acta Acustica united with Acustica

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An extensive parametric study has been carried out with a wave based model to numerically investigate the fundamental repeatability and reproducibility of labo- elements, the reproducibility of the intensity method is better. For heavy walls and lightweight double constructions, however, the predicted uncertainty is similar for the three measurement methods. The results of the reproducibility study are also used to investigate systematic differences between the pressure method and both intensity methods.

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Section: Introductionmentioning

confidence: 99%

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

Dijckmans

Vermeir²

2013

Acta Acustica united with Acustica

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“…Some decades ago, several experimental studies demonstrated the niche effect [5][6][7][8][9], which was later investigated in theoretical and numerical studies [10][11][12][13]. So far, the following general findings on the niche effect have been obtained: 1) the effect is significant below the critical coincidence frequency; 2) the effect depends on the position of the specimen in the niche; 3) the lowest STL is obtained when the sample is located in the middle of the niche; 4) the highest STL is obtained when the sample is mounted flush at one of the edges of the niche; 5) the effect depends on the sectional shape of the niche around the specimen.…”

Section: Introductionmentioning

confidence: 99%

Numerical examination of niche effect on sound transmission loss of glass panes

Sakuma

Inoue

Seike

2017

Acoust. Sci. & Tech.

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In the laboratory measurement of the sound transmission loss of platelike building elements, a specimen mounted between coupled rooms causes the so-called niche effect. Normally a specimen is mounted inside an aperture in a thick wall, whereas in a special case where a specimen is mounted flush with the wall, a projecting box frame is additionally installed outside the opening. Firstly, the measurements of a glass pane with the two types of niche are numerically modeled by vibro-acoustic simulation, and the niche effect is examined while changing the niche depth and specimen position. As a result, it is revealed that the effect of the projecting niche is generally smaller than that of the recessing niche. Secondly, regarding the cross-sectional shape of the recessing niche, the smaller effect of the staggered niche specified in ISO 10140 is validated by comparison with that of a flat niche. Additionally, the incidence angle dependence of the niche effect is clarified.

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“…A practical concern in the determination of the sound transmission loss is indeed that the direct sound insulation of a building element can differ strongly from one laboratory to another, especially at low frequencies. [2][3][4][5][6] Even within a single laboratory, significant variations in the sound transmission loss have been measured, e.g., when changing the direction of transmission between both rooms. 7 Deterministic models have been employed for investigating the influence of individual parameters independently and without measurement errors, mainly at low frequencies.…”

Section: Introductionmentioning

confidence: 99%

Parametric uncertainty quantification of sound insulation values

Reynders

2014

The Journal of the Acoustical Society of America

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A probabilistic framework is developed for quantifying the combined effect of uncertain parameters in sound insulation measurements, such as test sample dimensions, room properties, and loudspeaker positions, on the sound insulation values. The joint probability distribution of the uncertain parameters is constructed from the available information by means of a maximum entropy approach. The resulting sound insulation predictions are fully compatible with the available information but otherwise maximally conservative, so that the robustness of the predictions is guaranteed. Fundamental insight in the inherent uncertainty of the measurement procedure for airborne sound insulation is obtained by combining the method with detailed numerical simulations of the measurement procedure for single and double walls. The resulting uncertainty levels are very large, especially in the lowest frequency bands, and agree with experimental results. Furthermore, the probability distribution of the band-averaged sound reduction index of modally sparse walls can be of bimodal form.

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Sound transmission loss of glass and windows in laboratories with different room design

Cited by 10 publications

References 6 publications

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

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

Numerical examination of niche effect on sound transmission loss of glass panes

Parametric uncertainty quantification of sound insulation values

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