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Antonio Uris - One of the best experts on this subject based on the ideXlab platform.

  • Influence of cavity absorption on Sound insulation of gypsum board walls with circular apertures with varying overlap
    9th European Conference on Noise Control EURONOISE 2012, 2012
    Co-Authors: Jaime Llinares, Jose Maria Bravo, Antonio Uris
    Abstract:

    In this paper, the decrease in Sound Reduction Index double leaf steel stud gypsum board walls with the space between gypsum boards with circular apertures was examined experimentally. The results shows how the distance between centres of the circular apertures on each side of the partition and the presence of mineral wool in the partition cavity affect the Sound Reduction Index of the whole partition. It is shown that the Sound insulation of the partition is strongly dependent on the relative position of the apertures on each steel frame and the Reduction in Sound insulation due to circular apertures is lower in partitions without mineral wool in the cavity, since the effect of circular apertures is more important in the case of partitions with high Sound insulation. © European Acoustics Association.

  • Sound Insulation of Lightweight Partitions with Circular Apertures with Varying Overlap
    Acta Acustica United With Acustica, 2008
    Co-Authors: Jose Maria Bravo, Vicente Gomez-lozano, Antonio Uris, Carmen Llinares, Hermelando Estelles
    Abstract:

    A simple prediction model is developed to predict the decrease in Sound Reduction Index in single and double frame lightweight partitions with the space between gypsum boards filled mineral wool and with circular apertures. The calculation model shows how the distance between centres of the circular apertures on each side of the partition affects the Sound Reduction Index of the whole partition. Calculated results are compared with measured ones. In general, the prediction model developed shows good agreement with the measured results.

  • On the Sound insulation of masonry wall facades
    Building and Environment, 2008
    Co-Authors: Ignacio Guillen, Jaime Llinares, Hermelando Estelles, Antonio Uris, Ana Llopis
    Abstract:

    Abstract In this paper, laboratory measurements of Sound Reduction Index for two types of cavity walls commonly used in facades are presented. The first type consists of “masonry–air cavity–brick” and the second one consists of “masonry–air cavity–-gypsum board”. Data are used to show that masonry walls with gypsum boards provide higher Sound insulation than masonry cavity walls. The influence on Sound Reduction Index of apertures made on external leaf of the wall to ventilate the cavity of the wall is also examined.

  • Application of principal component analysis to the airborne Sound insulation of gypsum board partitions
    Acta Acustica united with Acustica, 2007
    Co-Authors: Alvaro Page, Antonio Uris, Jaime Lunares
    Abstract:

    In this paper the information lost when a single number rating (Rw or STC) instead of Sound Reduction Index curves are used, is quantified by using a novel statistical technology named Functional Data Analysis. This statistical technique works with observations constituted by a function instead of by discrete values. To describe the functions, Principal Component Analysis is used. The statistical analysis is applied to uncoupled gypsum board partitions. The analysis of principal components shows that is possible to represent one Sound Reduction Index curve by means of only two indices, that are able to retain 99% of the original information (measured like explained variance) of a family of partitions with similar characteristics. The first identified component explains the majority of the variability of the curves family (95% of the total variance). It is a global insulation factor that quantifies the airborne Sound insulation of a partition and the correlation with R, and STC ratings is higher than 0.98. The second one is related with the isolation at low frequencies. From these indices, predictive empirical models, based on the physical characteristics of the partitions, can be defined to estimate the Sound Reduction Index curves.

  • Sound insulation of double frame partitions with an internal gypsum board layer
    Applied Acoustics, 2006
    Co-Authors: Antonio Uris, Vicente Gomez-lozano, Jose Maria Bravo, Patricio Ramírez, Jaime Llinares
    Abstract:

    Abstract To avoid the undesirable effects of a faulty sealing of outlet boxes, it is common to insert a gypsum board layer in the middle of a double frame partition. In this paper, measured Sound Reduction Index data for double frame partitions, with and without a gypsum board layer insert, are presented. The results obtained show that the Sound insulation decreases at low frequencies due to the presence of the internal layer. The weighted Sound Reduction Index, which is strongly affected by the low frequency Sound insulation, decreases by 7–8 dB. Since these degradations are greater than those resulting from small gaps in partitions, it can be concluded that the insertion of a gypsum board layer in the middle of a double frame partition is not a suitable solution to the undesirable effects of faulty sealing of outlet boxes.

John Pearse - One of the best experts on this subject based on the ideXlab platform.

  • The Uncertainty of the Proposed Single Number Ratings for Airborne Sound Insulation
    Building Acoustics, 2012
    Co-Authors: Jeffrey Mahn, John Pearse
    Abstract:

    A replacement of the ISO 717-1 standard for the calculation of the single number ratings for airborne Sound insulation has been proposed. The proposed replacement, ISO 16717-1 introduces new single number ratings for airborne Sound insulation. The weighted Sound Reduction Index which has traditionally been calculated from the Sound Reduction Index measured in the 1/3 octave bands from 100 Hz to 3150 Hz will be replaced by a new single number rating Rliving which is calculated from the 1/3 octave bands between 50 Hz and 5000 Hz. The uncertainty of the proposed single number ratings has been estimated using the ISO Guide to the Expression of Uncertainty in Measurement (GUM) and validated using Monte Carlo simulations. The uncertainty of the single number ratings of 200 building elements was evaluated. It was found that the uncertainty of the single number ratings is highly dependent on the shape of the Sound Reduction Index curve. The uncertainty of the new single number rating Rliving was found to be great...

  • revisions to the en12354 prediction method of calculating the flanking Sound Reduction Index of lightweight building elements
    Journal of the Acoustical Society of America, 2012
    Co-Authors: Jeffrey Mahn, John Pearse
    Abstract:

    There is great interest worldwide in applying the standard, EN12354 to predict the flanking Sound Reduction Index to lightweight building elements. However, there are several problems which must be overcome before the prediction method can be accurately applied to lightweight building elements. One problem is the prediction of the resonant component of the Sound Reduction Index of the elements under investigation. As part of the work of COST Action FP0702, several methods of calculating the resonant component have been proposed and 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 measured values for a series of elements. The elements included single, homogeneous elements and double leaf elements. This paper presents the details of that evaluation. A correction factor based on the radiation efficiencies of the elements which was proposed by CSTB is recommended.

  • the calculation of the resonant Sound Reduction Index for use in en12354
    2012
    Co-Authors: Jeffrey Mahn, John Pearse
    Abstract:

    The application of the EN12354 prediction method to lightweight building constructions which typically have critical frequencies in or above the frequency range of interest requires the estimation of the resonant Sound Reduction Index. Since the resonant Sound Reduction Index can not be directly measured, the value must be estimated from measured data or calculated theoretically. Several methods of estimating the resonant Sound Reduction Index have been evaluated. An alternative method of calculating the flanking Sound Reduction Index as proposed by Villot and Guigou-Carter has also 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 several different lightweight building element constructions. The constructions included single, homogeneous elements as well as double leaf elements. The alternative method of predicting the flanking Sound Reduction Index as proposed by Villot and Guigou-Carter is recommended.

  • revising the en12354 method of calculating the flanking Sound Reduction Index of lightweight building elements
    2012
    Co-Authors: Jeffrey Mahn, John Pearse
    Abstract:

    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.

  • on the uncertainty of the en12354 1 estimate of the flanking Sound Reduction Index due to the uncertainty of the input data
    Building Acoustics, 2009
    Co-Authors: Jeffrey Mahn, John Pearse
    Abstract:

    Equations to calculate the uncertainty of the EN12354-1 estimate of the flanking Sound Reduction Index due to the uncertainty of the input data are derived using the method of the ISO Guide to the Expression of Uncertainty in Measurement (GUM). The uncertainty equations have been validated using Monte Carlo simulations. It is shown that the magnitude of the uncertainty depends on the uncertainty of the resonant Sound Reduction indices of the elements, the uncertainty of the vibration Reduction Index and the uncertainty of the equivalent absorption lengths and areas of the elements. However, equations could not be derived to calculate the uncertainty of the EN12354 estimate of the apparent Sound Reduction Index which has a log-normal probability density function and is therefore outside of the scope of the method of GUM. Monte Carlo simulations must be used to calculate the uncertainty of the apparent Sound Reduction Index. It is recommended that guidance for calculating and declaring the uncertainty is in...

Ulrica Kernen - One of the best experts on this subject based on the ideXlab platform.

  • acoustic properties of double plate systems part ii the Sound Reduction Index of finite size thin plates
    2005
    Co-Authors: Ulrica Kernen
    Abstract:

    Acoustic Properties of Double Plate Systems, Part II : The Sound Reduction Index of Finite-Size Thin Plates

  • Acoustic Properties of Double Plate Systems, Part I : An Analytical Model
    2005
    Co-Authors: Ulrica Kernen
    Abstract:

    The Sound insulation demands for dwellings and public building has increased over the years as the number of Sound sources has grown. From the outside our homes are exposed to noise from cars, trains, airplanes, etc. Noise intrudes from our neighbours and their television and stereo equipments. Also noise from spaces for mechanical services systems tends to become more important due to increasing energy saving demands. This thesis presents new analytical models for predicting the Sound Reduction Index of single or double plate systems. In the single plate case, a theoretical and experimental analysis of the air-borne Sound transmission through a single plate is presented. The plate is assumed to be excited by a diffuse Sound field and the velocity distribution of the plate is derived from the Kirchoff plate equation in the frequency domain. The resulting Fourier transform is evaluated using residue calculus and the solution is verified numerically. The analytical model is valid for a wide frequency range, both below, above and at the critical frequency. Special interest is paid to the area dependency of the Sound Reduction Index. This technique is further expanded for the double plate case by adding another plate and an intermediate layer which is modelled as a locally reacting spring. The model is valid and continuous through both the mass-spring-mass resonance and the coincidence region. The results from the analytical models show good agreement with measured results in both the single and double plate case. A simplified model is also presented for the Sound Reduction Index of finite size floating floors. The model is valid for two elastic plates with a resilient layer in between where the bottom plate, the load-bearing slab, is assumed to be excited with a diffuse airborne Sound field. The top plate and the resilient layer compose the floating floor. The problem is solved for frequencies below, between and above the critical frequencies of the plates. Above the critical frequency of the load-bearing plate, but below that of the floating slab, the main coupling between the plates will occur at the coincidence angle of the load-bearing plate. Above the critical frequency of both plates, the main transmission will occur at the angle of coincidence of each plate. As the plates will interact, the Sound insulation improvement will to some extent depend on the properties of the load-bearing slab. It is shown how the Sound Reduction Index depends on the physical parameters and the geometry of the plates.

  • Airborne Sound Insulation of a Thin Plate of Finite Dimensions
    Acta Acustica United With Acustica, 2005
    Co-Authors: Ulrica Kernen, Osama Hassan
    Abstract:

    The Sound insulation demands for dwellings and public building has increased over the years as the number of Sound sources has grown. From the outside our homes are exposed to noise from cars, trains, airplanes, etc. Noise intrudes from our neighbours and their television and stereo equipments. Also noise from spaces for mechanical services systems tends to become more important due to increasing energy saving demands. This thesis presents new analytical models for predicting the Sound Reduction Index of single or double plate systems. In the single plate case, a theoretical and experimental analysis of the air-borne Sound transmission through a single plate is presented. The plate is assumed to be excited by a diffuse Sound field and the velocity distribution of the plate is derived from the Kirchoff plate equation in the frequency domain. The resulting Fourier transform is evaluated using residue calculus and the solution is verified numerically. The analytical model is valid for a wide frequency range, both below, above and at the critical frequency. Special interest is paid to the area dependency of the Sound Reduction Index. This technique is further expanded for the double plate case by adding another plate and an intermediate layer which is modelled as a locally reacting spring. The model is valid and continuous through both the mass-spring-mass resonance and the coincidence region. The results from the analytical models show good agreement with measured results in both the single and double plate case. A simplified model is also presented for the Sound Reduction Index of finite size floating floors. The model is valid for two elastic plates with a resilient layer in between where the bottom plate, the load-bearing slab, is assumed to be excited with a diffuse airborne Sound field. The top plate and the resilient layer compose the floating floor. The problem is solved for frequencies below, between and above the critical frequencies of the plates. Above the critical frequency of the load-bearing plate, but below that of the floating slab, the main coupling between the plates will occur at the coincidence angle of the load-bearing plate. Above the critical frequency of both plates, the main transmission will occur at the angle of coincidence of each plate. As the plates will interact, the Sound insulation improvement will to some extent depend on the properties of the load-bearing slab. It is shown how the Sound Reduction Index depends on the physical parameters and the geometry of the plates.

  • Sound insulation of a single plate a discussion on the area dependency of the Sound Reduction Index
    Inter-Noise 2004 Prag Tjeckien 22 8-25 8 2004., 2004
    Co-Authors: Ulrica Kernen
    Abstract:

    The Sound insulation demands for dwellings and public building has increased over the years as the number of Sound sources has grown. From the outside our homes are exposed to noise from cars, trains, airplanes, etc. Noise intrudes from our neighbours and their television and stereo equipments. Also noise from spaces for mechanical services systems tends to become more important due to increasing energy saving demands. This thesis presents new analytical models for predicting the Sound Reduction Index of single or double plate systems. In the single plate case, a theoretical and experimental analysis of the air-borne Sound transmission through a single plate is presented. The plate is assumed to be excited by a diffuse Sound field and the velocity distribution of the plate is derived from the Kirchoff plate equation in the frequency domain. The resulting Fourier transform is evaluated using residue calculus and the solution is verified numerically. The analytical model is valid for a wide frequency range, both below, above and at the critical frequency. Special interest is paid to the area dependency of the Sound Reduction Index. This technique is further expanded for the double plate case by adding another plate and an intermediate layer which is modelled as a locally reacting spring. The model is valid and continuous through both the mass-spring-mass resonance and the coincidence region. The results from the analytical models show good agreement with measured results in both the single and double plate case. A simplified model is also presented for the Sound Reduction Index of finite size floating floors. The model is valid for two elastic plates with a resilient layer in between where the bottom plate, the load-bearing slab, is assumed to be excited with a diffuse airborne Sound field. The top plate and the resilient layer compose the floating floor. The problem is solved for frequencies below, between and above the critical frequencies of the plates. Above the critical frequency of the load-bearing plate, but below that of the floating slab, the main coupling between the plates will occur at the coincidence angle of the load-bearing plate. Above the critical frequency of both plates, the main transmission will occur at the angle of coincidence of each plate. As the plates will interact, the Sound insulation improvement will to some extent depend on the properties of the load-bearing slab. It is shown how the Sound Reduction Index depends on the physical parameters and the geometry of the plates.

  • Airborne Sound Insulation of Floating Floors
    Acustica, 2000
    Co-Authors: Ulrica Kernen
    Abstract:

    An analytical model is presented for the Sound Reduction Index of finite size floating floors. The model consists of two elastic plates with a resilient layer in between. The bottom plate, the lo ...

Jeffrey Mahn - One of the best experts on this subject based on the ideXlab platform.

  • on the measurement of the radiation efficiency for the estimate of the resonant Sound Reduction Index
    Journal of the Acoustical Society of America, 2017
    Co-Authors: Jeffrey Mahn, Christoph Holler
    Abstract:

    The estimate of the resonant Sound Reduction Index has received attention over the years as the prediction method described in the standard, ISO 15712 has been applied to lightweight building constructions. A method of estimating the resonant Sound Reduction Index involves the measurement of the total and the resonant radiation efficiencies of the building elements involved in the first order flanking paths. The radiation efficiencies of different lightweight wall constructions were evaluated as part of a study conducted at the National Research Council Canada are presented. The study focused on the measurement of the radiation efficiencies with the aim of developing guidelines for the measurements. Predicted values of the flanking transmission loss for each flanking path are compared to data which was measured in the National Research Council's eight room flanking facility.

  • The Uncertainty of the Proposed Single Number Ratings for Airborne Sound Insulation
    Building Acoustics, 2012
    Co-Authors: Jeffrey Mahn, John Pearse
    Abstract:

    A replacement of the ISO 717-1 standard for the calculation of the single number ratings for airborne Sound insulation has been proposed. The proposed replacement, ISO 16717-1 introduces new single number ratings for airborne Sound insulation. The weighted Sound Reduction Index which has traditionally been calculated from the Sound Reduction Index measured in the 1/3 octave bands from 100 Hz to 3150 Hz will be replaced by a new single number rating Rliving which is calculated from the 1/3 octave bands between 50 Hz and 5000 Hz. The uncertainty of the proposed single number ratings has been estimated using the ISO Guide to the Expression of Uncertainty in Measurement (GUM) and validated using Monte Carlo simulations. The uncertainty of the single number ratings of 200 building elements was evaluated. It was found that the uncertainty of the single number ratings is highly dependent on the shape of the Sound Reduction Index curve. The uncertainty of the new single number rating Rliving was found to be great...

  • revisions to the en12354 prediction method of calculating the flanking Sound Reduction Index of lightweight building elements
    Journal of the Acoustical Society of America, 2012
    Co-Authors: Jeffrey Mahn, John Pearse
    Abstract:

    There is great interest worldwide in applying the standard, EN12354 to predict the flanking Sound Reduction Index to lightweight building elements. However, there are several problems which must be overcome before the prediction method can be accurately applied to lightweight building elements. One problem is the prediction of the resonant component of the Sound Reduction Index of the elements under investigation. As part of the work of COST Action FP0702, several methods of calculating the resonant component have been proposed and 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 measured values for a series of elements. The elements included single, homogeneous elements and double leaf elements. This paper presents the details of that evaluation. A correction factor based on the radiation efficiencies of the elements which was proposed by CSTB is recommended.

  • the calculation of the resonant Sound Reduction Index for use in en12354
    2012
    Co-Authors: Jeffrey Mahn, John Pearse
    Abstract:

    The application of the EN12354 prediction method to lightweight building constructions which typically have critical frequencies in or above the frequency range of interest requires the estimation of the resonant Sound Reduction Index. Since the resonant Sound Reduction Index can not be directly measured, the value must be estimated from measured data or calculated theoretically. Several methods of estimating the resonant Sound Reduction Index have been evaluated. An alternative method of calculating the flanking Sound Reduction Index as proposed by Villot and Guigou-Carter has also 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 several different lightweight building element constructions. The constructions included single, homogeneous elements as well as double leaf elements. The alternative method of predicting the flanking Sound Reduction Index as proposed by Villot and Guigou-Carter is recommended.

  • revising the en12354 method of calculating the flanking Sound Reduction Index of lightweight building elements
    2012
    Co-Authors: Jeffrey Mahn, John Pearse
    Abstract:

    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.

Jaime Llinares - One of the best experts on this subject based on the ideXlab platform.

  • Influence of cavity absorption on Sound insulation of gypsum board walls with circular apertures with varying overlap
    9th European Conference on Noise Control EURONOISE 2012, 2012
    Co-Authors: Jaime Llinares, Jose Maria Bravo, Antonio Uris
    Abstract:

    In this paper, the decrease in Sound Reduction Index double leaf steel stud gypsum board walls with the space between gypsum boards with circular apertures was examined experimentally. The results shows how the distance between centres of the circular apertures on each side of the partition and the presence of mineral wool in the partition cavity affect the Sound Reduction Index of the whole partition. It is shown that the Sound insulation of the partition is strongly dependent on the relative position of the apertures on each steel frame and the Reduction in Sound insulation due to circular apertures is lower in partitions without mineral wool in the cavity, since the effect of circular apertures is more important in the case of partitions with high Sound insulation. © European Acoustics Association.

  • On the Sound insulation of masonry wall facades
    Building and Environment, 2008
    Co-Authors: Ignacio Guillen, Jaime Llinares, Hermelando Estelles, Antonio Uris, Ana Llopis
    Abstract:

    Abstract In this paper, laboratory measurements of Sound Reduction Index for two types of cavity walls commonly used in facades are presented. The first type consists of “masonry–air cavity–brick” and the second one consists of “masonry–air cavity–-gypsum board”. Data are used to show that masonry walls with gypsum boards provide higher Sound insulation than masonry cavity walls. The influence on Sound Reduction Index of apertures made on external leaf of the wall to ventilate the cavity of the wall is also examined.

  • Sound insulation of double frame partitions with an internal gypsum board layer
    Applied Acoustics, 2006
    Co-Authors: Antonio Uris, Vicente Gomez-lozano, Jose Maria Bravo, Patricio Ramírez, Jaime Llinares
    Abstract:

    Abstract To avoid the undesirable effects of a faulty sealing of outlet boxes, it is common to insert a gypsum board layer in the middle of a double frame partition. In this paper, measured Sound Reduction Index data for double frame partitions, with and without a gypsum board layer insert, are presented. The results obtained show that the Sound insulation decreases at low frequencies due to the presence of the internal layer. The weighted Sound Reduction Index, which is strongly affected by the low frequency Sound insulation, decreases by 7–8 dB. Since these degradations are greater than those resulting from small gaps in partitions, it can be concluded that the insertion of a gypsum board layer in the middle of a double frame partition is not a suitable solution to the undesirable effects of faulty sealing of outlet boxes.

  • Sound insulation of double frame partitions with an internal gypsum board layer
    Applied Acoustics, 2006
    Co-Authors: Antonio Uris, Vicente Gomez-lozano, Jose Maria Bravo, Patricio Ramírez, Jaime Llinares
    Abstract:

    To avoid the undesirable effects of a faulty sealing of outlet boxes, it is common to insert a gypsum board layer in the middle of a double frame partition. In this paper, measured Sound Reduction Index data for double frame partitions, with and without a gypsum board layer insert, are presented. The results obtained show that the Sound insulation decreases at low frequencies due to the presence of the internal layer. The weighted Sound Reduction Index, which is strongly affected by the low frequency Sound insulation, decreases by 7-8 dB. Since these degradations are greater than those resulting from small gaps in partitions, it can be concluded that the insertion of a gypsum board layer in the middle of a double frame partition is not a suitable solution to the undesirable effects of faulty sealing of outlet boxes. © 2005 Elsevier Ltd. All rights reserved.

  • The influence of slits on Sound transmission through a lightweight partition
    Applied Acoustics, 2004
    Co-Authors: Antonio Uris, Jaime Llinares, Jose Maria Bravo, Hermelando Estelles
    Abstract:

    Abstract In this paper the influence on Sound Reduction Index of the length and the depth of Sound leaks at the perimeter of lightweight partitions was examined. It was shown that the most important decrease on Sound Reduction Index is caused by the first slit between lightweight partition and one of the structural members. When the length of the slit is increased, the decrease on Sound Reduction Index is less significative. Calculated results show the same effects as measured ones.