Parametric uncertainty quantification of sound insulation values

Reynders, Edwin

doi:10.1121/1.4868394

Cited by 9 publications

(8 citation statements)

References 27 publications

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“…However, the final result is assumed to be independent on the par-ticular dimensions of the junctions (as the formulas in the Annex E are). With this purpose in mind and considering the large variability that input data and outputs in building acoustics can have (see for example [20,21]), a group of 27 junction dimensions are always averaged in order to obtain a single result, representative for all of them. The plate dimensions considered are shown in Table 1, according to the sketch and notations in Fig.…”

Section: Methodsmentioning

confidence: 99%

Catalogue of Vibration Reduction Index Formulas for Heavy Junctions Based on Numerical Simulations

Poblet-Puig¹,

Guigou‐Carter²

2017

Acta Acustica united with Acustica

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The vibration reduction index (K ij ) is a key parameter in the prediction of flanking transmissions according to the EN-12354 standard. Formulas for the evaluation of K ij in L, T and X junctions that depend on the mass ratio are available in the Annex E. Junctions of straight elements with different thickness or thin elastic layers are also included. However, other junction types that are important for building industry are not considered: H-shaped junctions, L or T junctions not forming a right angle, asymmetrical T-junctions , X-junctions where only one of the parts is different (thickness or material) from the other two/three. In the current research, expressions for these non-covered junctions are provided. They are obtained by means of numerical simulations based on the spectral finite element method. K ij is predicted for a large population of junctions, considering usual thicknesses and heavy material combinations (no lightweight frame systems have been considered). Statistical analysis is carried out to obtain relatively simple formulae that could be used in acoustic design projects without the need for time-consuming computations with finite element software.

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Section: Methodsmentioning

confidence: 99%

Catalogue of Vibration Reduction Index Formulas for Heavy Junctions Based on Numerical Simulations

Poblet-Puig¹,

Guigou‐Carter²

2017

Acta Acustica united with Acustica

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“…In addition to the uncertainties that result from the limitations of the measurement technique, also the modal behavior of the receiving room creates an additional uncertainty. This uncertainty is related to changes in the receiving room dimensions (amongst different test facilities) and changes in the dynamics of the test wall [6,5,4,3].…”

Section: Sound Power Determinationmentioning

confidence: 99%

“…A standardized manner to determine the sound reduction index R of a building element in laboratory conditions, is described in ISO 10140:2010 [2]. It is known that the acoustic characteristics of the transmission suite can influence the measured sound reduction index [3,4,5,6], especially at low frequencies. Driven by an increasing awareness of the importance of low frequencies in people's perception of the isolation performance of building elements, there is a growing need to extend the reliable frequency range of sound insulation measurements towards frequencies below 100Hz.…”

Section: Introductionmentioning

confidence: 99%

Determining radiated sound power of building structures by means of laser Doppler vibrometry

Roozen

Labelle

Rychtáriková

et al. 2015

Journal of Sound and Vibration

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This paper introduces a methodology that makes use of laser Doppler vibrometry to assess the acoustic insulation performance of a building element. The sound power radated by the surface of the element is numerically determined from the vibrational pattern, offering an alternative for classical microphone measurements. Compared to the latter the proposed analysis is not sensitive to room acoustical effects. This allows the proposed methodology to be used at low frequencies, where the standardized microphone based approach suffers from a high uncertainty due to a low acoustic modal density. Standardized measurements as well as laser Doppler vibrometry measurements and computations have been performed on two test panels, a lightweight wall and a gypsum block wall and are compared and discussed in this paper. The proposed methodology offers an adequate solution for the assessment of the acoustic insulation of building elements at low frequencies. This is crucial in the framework of recent proposals of acoustic standards for measurement approaches and single number sound insulation performance ratings to take into account frequencies down to 50 Hz.

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“…A number of methods have been developed to address uncertainties in vibroacoustics. Reynders [6] uses the maximum entropy principle to compute confidence intervals for the TL of walls between two uncertain rooms, where the probability densities and cross-correlations of the considered parameters are known. Batko and Pawlik [7] use a method derived from interval arithmetics to estimate variability intervals for the same kind of constructions.…”

Section: Introductionmentioning

confidence: 99%

Global sensitivity analysis of analytical vibroacoustic transmission models

Christen

Ichchou

Troclet

et al. 2016

Journal of Sound and Vibration

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International audienceNoise reduction issues arise in many engineering problems. One typical vibroacoustic problem is the transmission loss (TL) optimisation and control. The TL depends mainly on the mechanical parameters of the considered media. At early stages of the design, such parameters are not well known. Decision making tools are therefore needed to tackle this issue. In this paper, we consider the use of the Fourier Amplitude Sensitivity Test (FAST) for the analysis of the impact of mechanical parameters on features of interest. FAST is implemented with several structural configurations. FAST method is used to estimate the relative influence of the model parameters while assuming some uncertainty or variability on their values. The method others a way to synthesize the results of a multiparametric analysis with large variability. Results are presented for transmission loss of isotropic, orthotropic and sandwich plates excited by a diffuse field on one side. Qualitative trends found agree with the physical expectation. Design rules can then be set up for vibroacoustic indicators. The case of a sandwich plate is taken as an example of the use of this method inside an optimisation process and for uncertainty quantification

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Parametric uncertainty quantification of sound insulation values

Cited by 9 publications

References 27 publications

Catalogue of Vibration Reduction Index Formulas for Heavy Junctions Based on Numerical Simulations

Catalogue of Vibration Reduction Index Formulas for Heavy Junctions Based on Numerical Simulations

Determining radiated sound power of building structures by means of laser Doppler vibrometry

Global sensitivity analysis of analytical vibroacoustic transmission models

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