Separation of Resonant and Non-Resonant Components—Part I: Sound Reduction Index

Mahn, Jeffrey; Pearse, John

doi:10.1260/135101008785082489

Cited by 7 publications

(15 citation statements)

References 15 publications

(17 reference statements)

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“…The normal incidence mass law produced positive values from 250 to 5000 Hz. It should be noted that the results given here are different from the results given in Mahn and Pearse (2008b). An error in the calculation of the non-resonant radiation efficiency has been discovered and corrected (Mahn, 2010).…”

Section: The En12354 Prediction Methodscontrasting

confidence: 59%

“…Below the critical frequency, the resonant sound transmission factor can be much smaller than the non-resonant sound transmission factor. Because of the measurement and prediction uncertainties, the calculated value can produce non-physical negative values (Mahn and Pearse, 2008b).…”

Section: The En12354 Prediction Methodsmentioning

confidence: 99%

“…Does only one leaf of a multi-leaf wall need to be considered? Mahn and Pearse (2008b) measured the sound transmission factor of a 1.6 mm thick steel panel from 100 Hz to 5 kHz and used various theories to predict the non-resonant sound transmission factor and subtracted it from the total sound transmission factor in order to obtain the resonant sound transmission factor. The critical frequency was in the 8 kHz band and the surface density was 12.51 kg/m 2 .…”

Section: The En12354 Prediction Methodsmentioning

confidence: 99%

“…The methods which have been proposed in the literature for the calculation of the resonant sound reduction index of lightweight elements will only work with single leaf, homogeneous, isotropic elements with the exception of the correction factor proposed by the Centre Scientifique et Technique du Bâtiment (CSTB). Mahn and Pearse (2008b) and Mahn and Stevenson (2008) tried a number of different methods of determining the resonant sound transmission factors of lightweight elements and found that the different methods resulted in a wide range of values, some of which were invalid.…”

Section: Introductionmentioning

confidence: 99%

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The prediction of flanking sound transmission below the critical frequency

Davy

Mahn

Guigou‐Carter

et al. 2012

The Journal of the Acoustical Society of America

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Although reliable methods exist to predict the apparent sound reduction index of heavy, homogeneous isotopic building constructions, these methods are not appropriate for use with lightweight building constructions which typically have critical frequencies in or above the frequency range of interest. Three main methods have been proposed for extending the prediction of flanking sound transmission to frequencies below the critical frequency. The first method is the direct prediction which draws on a database of measurements of the flanking transmission of individual flanking paths. The second method would be a modification of the method in existing standards. This method requires the calculation of the resonant sound transmission factors. However, most of the approaches proposed to calculate the resonant sound transmission factor work only for the case of single leaf homogeneous isotropic building elements and therefore are not readily applicable to complex building elements. The third method is the measurement or prediction of the resonant radiation efficiency and the airborne diffuse field excited radiation efficiency which includes both the resonant and the non-resonant radiation efficiencies. The third method can currently deal with complex building elements if the radiation efficiencies can be measured or predicted. This paper examines these prediction methods.

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Section: The En12354 Prediction Methodscontrasting

confidence: 59%

Section: The En12354 Prediction Methodsmentioning

confidence: 99%

Section: The En12354 Prediction Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The prediction of flanking sound transmission below the critical frequency

Davy

Mahn

Guigou‐Carter

et al. 2012

The Journal of the Acoustical Society of America

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“…The elements were connected by a corner junction and the vibration transmission factors were measured according to the standard, EN10848-1. The resonant sound reduction index of the elements was calculated according to the theory of Leppington [12] which was shown to give good results in one study [13]. Since the elements were identical, it was assumed that and therefore the radiation efficiency terms were excluded from the calculations.…”

Section: Rijen12354mentioning

confidence: 99%

Reciprocity and the Prediction of the Apparent Sound Reduction Index for Lightweight Structures According to EN12354

Mahn

Pearse

2008

The Journal of the Acoustical Society of America

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EN12354 makes use of reciprocity to cancel the radiation efficiency terms from the equations used to predict the apparent sound reduction index. The use of reciprocity works well for the application of EN12354 to massive, concrete structures with diffuse wave fields and with critical frequencies below the frequency range of interest. However, lightweight constructions may have critical frequencies above the frequency range of interest and may not support diffuse wave fields. The use of reciprocity for application to lightweight structures may introduce errors into the predictions. This study investigates the uncertainty introduced into the predictions of the apparent sound reduction index of lightweight constructions due to the use of reciprocity.

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Sound Transmission between Rooms with Curtain Wall Façades: A Case Study

et al. 2015

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Curtain walls have reached good performances in terms of façade sound and thermal insulation, as well as solar protection. Nevertheless, the sound insulation performance of the partition between adjoining rooms with continuous curtain wall façades is often reduced by the presence of direct and flanking transmission through the junction with the façade itself.\ud In this work, flanking and direct structural transmissions are analysed with reference to the joints of the mullion of the curtain wall with lightweight plasterboard partitions. Airborne sound insulation and vibration measurements were made in two adjacent rooms affected by the acoustic problems determined by the curtain wall joint. Traditional acoustic measurements, carried out according to EN ISO 16283–1, highlighted problems in sound insulation between rooms, but without any indication on different sound transmission paths through the wall. Vibration measurements were made for every part of the system (frame columns and beams, window panes, plasterboard wall, plasterboard false ceiling, etc.) to better understand the sound transmission paths in these kinds of structures. In this paper the results of this analysis are presented. Moreover, taking into account previous works and measurements made in this research field, different solutions for curtain wall structures are analysed and technical suggestions are given to improve airborne sound insulation between rooms separated by partitions mounted up to metal frames

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Separation of Resonant and Non-Resonant Components—Part I: Sound Reduction Index

Cited by 7 publications

References 15 publications

The prediction of flanking sound transmission below the critical frequency

The prediction of flanking sound transmission below the critical frequency

Reciprocity and the Prediction of the Apparent Sound Reduction Index for Lightweight Structures According to EN12354

Sound Transmission between Rooms with Curtain Wall Façades: A Case Study

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