On the Uncertainty of the EN12354-1: Estimate of the Flanking Sound Reduction Index Due to the Uncertainty of the Input Data

Mahn, Jeffrey; Pearse, John

doi:10.1260/135101009789877059

Cited by 10 publications

(6 citation statements)

References 26 publications

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“…This can be attributed to differences in the modelling such as the mesh, element type, excitation points, and post-processing. Mahn and Pearse [24] show that for this direction-average quantity, the uncertainty also depends on the difference between the directional velocity level differences. For these reasons the average difference would be expected to vary for different junctions.…”

Section: Finite Element Modelling With Fem and Sfemmentioning

confidence: 99%

Regression curves for vibration transmission across junctions of heavyweight walls and floors based on finite element methods and wave theory

et al. 2016

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Sound insulation prediction models in European and International standards use the vibration reduction index to calculate flanking transmission across junctions of walls and floors. These standards contain empirical relationships between the ratio of mass per unit areas for the walls/floors that form the junction and a frequency-independent vibration reduction index. Calculations using wave theory show that there is a stronger relationship between the ratio of characteristic moment impedances and the transmission loss from which the vibration reduction index can subsequently be calculated. In addition, the assumption of frequency-independent vibration reduction indices has been shown to be incorrect due to in-plane wave generation at the junction. Therefore numerical experiments with FEM, SFEM and wave theory have been used to develop new regression curves between these variables for the low-, mid- and high-frequency ranges. The junctions considered were L-, T- and X-junctions formed from heavyweight walls and floors. These new relationships have been implemented in the prediction models and they tend to improve the agreement between the measured and predicted airborne and impact sound insulation.Peer ReviewedPostprint (author's final draft

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Section: Finite Element Modelling With Fem and Sfemmentioning

confidence: 99%

Regression curves for vibration transmission across junctions of heavyweight walls and floors based on finite element methods and wave theory

et al. 2016

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“…In the building, the transmission of vibrations through the junctions of the structure are very important in order to predict the indirect sound insulation. Final design quality highly depends on the uncertainty of input parameters such as D ν,ij [10]. But it depends on the specific situation (dimensions, boundary conditions, damping) or the laboratory conditions.…”

Section: Introductionmentioning

confidence: 99%

Using spectral finite elements for parametric analysis of the vibration reduction index of heavy junctions oriented to flanking transmissions and EN-12354 prediction method

Poblet-Puig

Guigou‐Carter

2015

Applied Acoustics

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The vibration reduction index of heavy junctions is predicted by means of a model based on spectral finite elements. This is equivalent to a finite element method but faster and with smaller computational costs. This advantage is used in order to perform a parametric analysis of the vibration reduction index for several junction types: T-shaped, L-shaped and +-shaped. The influence of several parameters such as: damping, junction dimensions or the mass ratio on the vibration reduction index is observed. The study is focussed to provide data and guidelines oriented to the EN-12354 design method for flanking transmission in buildings.

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“…The error bars in the figure are the 95% confidence interval based on the standard deviation of repeatability of the measurements calculated according to GUM. 11 The Calculated Input Data Method is shown to over predict the flanking sound reduction index by up to 15.5 dB. The CSTB correction factor based on the measured radiation efficiencies was within 2 dB and a maximum of 6.9 dB of the measured value.…”

Section: Resultsmentioning

confidence: 81%

Revisions to the EN12354 prediction method of calculating the flanking sound reduction index of lightweight building elements

Mahn

Pearse

2012

The Journal of the Acoustical Society of America

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There is great interest worldwide in using the standard, EN12354 to predict the flanking sound reduction index of lightweight building constructions. However, there are several problems which must be overcome before the prediction method can be accurately applied to lightweight building elements. One problem is that the resonant component of the sound reduction index of lightweight elements must typically be determined for the predictions. Three methods of determining the resonant component which are being considered by COST Action FP0702 have been evaluated. The evaluation was conducted by comparing the predicted flanking sound reduction indices which were calculated using the different methods of calculating the resonant sound reduction index to the measured flanking intensity sound reduction index for a series of elements. The elements included single, homogeneous elements and double leaf elements. The determination of the resonant sound reduction index using a correction factor proposed by CSTB based on the radiation efficiencies of the elements is recommended.

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On the Uncertainty of the EN12354-1: Estimate of the Flanking Sound Reduction Index Due to the Uncertainty of the Input Data

Cited by 10 publications

References 26 publications

Regression curves for vibration transmission across junctions of heavyweight walls and floors based on finite element methods and wave theory

Regression curves for vibration transmission across junctions of heavyweight walls and floors based on finite element methods and wave theory

Using spectral finite elements for parametric analysis of the vibration reduction index of heavy junctions oriented to flanking transmissions and EN-12354 prediction method

Revisions to the EN12354 prediction method of calculating the flanking sound reduction index of lightweight building elements

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