Separation of Resonant and Non-Resonant Components—Part II: Surface Velocity

Mahn, Jeffrey; Stevenson, D. C.

doi:10.1260/135101008785082524

Cited by 5 publications

(6 citation statements)

References 10 publications

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“…additional uncertainty to the calculations. Two methods of separating the components of the mean square velocity are examined in a companion paper [10]. The correction factors that depend on the mean square velocity of the element include: Nightingale [5]: (9) where η tot is the total loss factor of the element, f c is the critical frequency and and are the resonant and non-resonant components of the mean square velocity of the element, respectively.…”

Section: Correction Factors Based On the Mean Square Velocitymentioning

confidence: 99%

“…The correction factors that depend on the mean square velocity of the panel were calculated for the steel panel using a modified least square method and data from a series of damped, steel panels as described in a companion paper [10]. The components of the mean square velocity of the MDF panels were not evaluated.…”

Section: Prediction Of the Resonant Component By Correction Factorsmentioning

confidence: 99%

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

Mahn

Pearse

2008

Building Acoustics

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There is much interest in applying EN12354-1 to lightweight buildings elements which may have critical frequencies above the frequency range of interest. The standard requires that only the resonant component of the sound reduction index be used in the predictions and therefore a reliable method of calculating the resonant component is needed for these elements. Several methods of calculating the resonant component are examined in this study. It was found that the various predictions of the resonant component can differ by as much as 18 dB. Calculation of the resonant component by subtracting the theoretical non-resonant component from the measured value was unreliable due to measurement uncertainty. Calculation of the resonant component using correction factors based on the components of the mean square velocity may be possible but may also be susceptible to measurement uncertainty. Definitive guidance for calculating the resonant component is needed in future revisions of EN12354-1 if it is to be applied to lightweight constructions.

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Section: Correction Factors Based On the Mean Square Velocitymentioning

confidence: 99%

Section: Prediction Of the Resonant Component By Correction Factorsmentioning

confidence: 99%

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

Mahn

Pearse

2008

Building Acoustics

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“…Nevertheless, it is known [16,17] that also in the case of homogeneous single panels it is difficult to accurately estimate the radiation efficiency and to calculate the Sound Reduction Index, due to the complexity of the separation of the resonant and non-resonant components. It is well known that the method described in the EN 12354-1 is not suitable for multilayer lightweight structures [18,19], with relatively small dimensions and various edge conditions: only approximate results are given with this method.…”

Section: Estimation Of Different Transmission Pathsmentioning

confidence: 99%

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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“…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%

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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Separation of Resonant and Non-Resonant Components—Part II: Surface Velocity

Cited by 5 publications

References 10 publications

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

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

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

The prediction of flanking sound transmission below the critical frequency

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