Marc Buret - Academia.edu (original) (raw)

Papers by Marc Buret

Research paper thumbnail of Predictions of Sound Due to a Moving Source Near Finite Impedance Ground

Research paper thumbnail of Development of a guideline for the assessment of low frequency noise in Victoria, Australia

Journal of the Acoustical Society of America, Sep 30, 2023

Research paper thumbnail of Optimisation of ground attenuation for moving sound sources

Applied Acoustics, Feb 1, 2006

ABSTRACT In an earlier study, Attenborough and Li [Attenborough K, Li, KM. Ground effect for A-we... more ABSTRACT In an earlier study, Attenborough and Li [Attenborough K, Li, KM. Ground effect for A-weighted noise in the presence of turbulence and refraction. J Acoust Soc Am 102:1997;1013–22] derived a closed form analytical formula to calculate optimum ground parameters for reducing the A-weighted noise due to a stationary point source. This paper extends this earlier study by deriving an expression to calculate the sound field due to a source moving at a constant speed above a ground surface. An A-weighted mean-square sound pressure has been derived that enables one to estimate the sound exposure levels of a moving source. Numerical calculations for a realistic range of speeds show the influence of the source motion on the noise levels. Although the predicted effects on the ground attenuation are moderate, they are significant at a relatively low Mach number. In addition, the sensitivity to the atmospheric turbulence and the geometrical parameters tends to be altered by the source motion. On the other hand, it is demonstrated that the optimum ground parameters are similar for stationary and moving sources.

Research paper thumbnail of Diffraction of sound due to moving sources by barriers and ground discontinuities

Journal of the Acoustical Society of America, Sep 1, 2006

Research paper thumbnail of A Metric Matrix Establishment for Cases Studies on the Effectiveness of the Key Environmental Protection Policies for Transportation Pollution Control

In a study of the Effectiveness of the Key Environmental Protection Policies for Road Traffic Noi... more In a study of the Effectiveness of the Key Environmental Protection Policies for Road Traffic Noise Control, the authors discussed 20 international case studies of road traffic and noise management. Although the key international environmental policies for road traffic noise control in developed countries are very technologically, economically, legally, and sociologically mature, these policies do not always result in compatible land use: roadways and highways are still built too close to existing residential areas, and vice versa. In China these issues are exacerbated due to its rapid urban growth and industrial expansion. In this paper, the authors expand their study to include non-noise policies (air pollution, public participation in the planning process, and other important factors) but the noise & vibration are the first impact metrics (e.g. airport, railway, shipping), and suggest a multi-dimensional matrix for such cases studies. At last, an airport case in China is employed...

Research paper thumbnail of Long-Term Asphalt Trial: Results of Acoustic Tests After Three Years

Acoustics Australia, Jul 14, 2016

In 2013, VicRoads initiated a long-term trial to investigate the acoustic performance of various ... more In 2013, VicRoads initiated a long-term trial to investigate the acoustic performance of various asphalt pavements constructed as variations to the standard specification for Victorian roads (Simpson et al. in Proceedings of the 26th Australian Road Research Board (ARRB) conference, Sydney, Australia, 2014). Acoustic testing of these five variations included statistical pass-by tests, as well as close proximity (ISO/DIS 11819-2 in Acoustics-measurement of the influence of road surfaces on traffic noise-Part 2: the close-proximity method, International Standard Organization, Geneva, 2013) and onboard sound intensity measurements (AASHTO TP 76-12 in Standard method of test for measurement of tire/pavement noise using the on-board sound intensity (OBSI) method. American Association of State Highway and Transportation Officials, Washington, 2012). The data collected from the most recent trials are presented along with that previously gathered over the first 3 years of the trial. The best-performing section of pavement was found to be a wearing surface that was treated by diamond grinding, and that showed a consistent improvement in noise reduction of up to 3 dB(A) over the standard open-graded asphalt.

Research paper thumbnail of New analytical models for outdoor moving sources of sound

Research paper thumbnail of Long-Term Asphalt Trial: Results of Acoustic Tests After Three Years

Acoustics Australia, 2016

Research paper thumbnail of Screening by edge-modified barriers of road traffic noise in high-rise buildings

Optimization of the acoustic performance of roadside noise barriers has been investigated from th... more Optimization of the acoustic performance of roadside noise barriers has been investigated from the 1980´s on in many different countries. In particular, France, Japan, the Netherlands and the U.K conducted extensive research and development for improving the acoustic performance of edge-modified barriers. Several supplemental algorithms to road traffic noise prediction schemes have been developed to account for edge-modified barriers. However, most of these studies only focused on the assessment of the screening performance in the shadow zone where the receivers are at relatively low heights. In the situation of high-rise cities, many noise sensitive receivers are located at significant heights where the attenuation due to a typical noise barrier is greatly reduced. This paper reports a numerical study to estimate the acoustic performance of the edgemodified barriers with four different profiles. The numerical simulations assess and compare the acoustic effectiveness of these edge-modified barriers at various receiver positions. a

Research paper thumbnail of Comparative assessment for low-noise pavements by means of the ISO 11819 and the OBSI

http://www.acoustics.asn.au/conference\_proceedings/INTERNOISE2014/papers/p412.pdf

Research paper thumbnail of Diffraction of Sound from a Dipole Source

An asymptotic approximation for the total sound field for an arbitrarily-orientated dipole placed... more An asymptotic approximation for the total sound field for an arbitrarily-orientated dipole placed above an impedance plane can be written in a form similar to the classical formula for a monopole. Pierce's calculation for the diffraction of spherical waves by a hard wedge has been adapted to the case of dipole sources. By using both of these results, a model for the calculation of the sound field due to a dipole source in the presence of a barrier on finite impedance ground is proposed. The predictions have been found to compare well with laboratory measurements.

Research paper thumbnail of Asphalt trials to reduce traffic noise levels

ABSTRACT This paper concerns a trial aimed at reducing traffic noise levels by means of low noise... more ABSTRACT This paper concerns a trial aimed at reducing traffic noise levels by means of low noise asphalt road pavement surfacings. The trial is being conducted on the Mornington Peninsula Freeway in Melbourne, Australia and includes seven different types of asphalt pavement surfaces which were laid in March 2013. The trial is a joint project involving VicRoads and Boral. Previous investigations in Australia had shown that the acoustic performance of conventional open graded asphalts (OGA) approached that of dense graded asphalts (DGA) after a few years. However, overseas studies have demonstrated that this deterioration in the acoustic performance of OGA could be reduced when OGA were constructed as double layers, at various depths and also when treatments, such as grinding, were applied to the surface. The trial pavement surfaces includes a conventional OGA, an OGA where the surface was treated using diamond grinding to provide a smoother surface whilst maintaining porosity, two sections of double layer OGA, a stone mastic asphalt (SMA) and two proprietary mixes. Road traffic noise generated on each trial section is being determined by the Statistical Pass-by Method, by the Close Proximity Method and by the On Board Sound Intensity Method. The acoustic performances of the trial pavement surfaces will be determined by these methods over a five year period. The paper summarises the planning, design and construction of the trial sections and presents part of the acoustic performance and asphalt testing results of the trial over the initial year.

Research paper thumbnail of Application of Quadratic Residue Diffusers to Transportation Noise Control

While Quadratic residue diffusers (QRD or Schroeder diffusers) have been used in architectural ac... more While Quadratic residue diffusers (QRD or Schroeder diffusers) have been used in architectural acoustics for some time, investigation into the use of diffusive devices on a barrier top for transportation noise abatement is fairly recent. Their potential resides in their high scattering effectiveness that can be tuned to a desired frequency range. Use of QRDs as noise reducers placed on top of noise barriers was investigated at the University of Salford. BEM simulations and scale model measurements have shown the relevance of such devices. On this basis Supreme Environmental Research (Shenzhen) Ltd. developed a line of innovative barrier caps designed to be effective in the low to mid frequency range where normal barrier attenuation is moderate while contribution to A-weighted levels is significant. Measurements at a controlled outdoor site have proven the effectiveness of the noise reducers. They were adopted by the Mass Transit Railway Corporation in Hong Kong as the noise mitigati...

Research paper thumbnail of Hybrid sound absorbers combining micro-perforated panels with conventional absorption mechanisms

The Journal of the Acoustical Society of America, 2012

Combination of microperforated panels with optimised efficiency in the low frequency range and ot... more Combination of microperforated panels with optimised efficiency in the low frequency range and other sound absorption systems that provide performance in the mid and high frequencies is presented for two sound absorber designs. In the first instance, proprietary fabric cover and fibrous absorption have been used to extend the performance range of discrete microperforated absorber units by optimising sound absorption by the edge of the units. The second development consists of conventional Helmholtz resonator perforated panels that have been customised using a micro-perforated panel in view to tune and enhance the low frequency performance. Results of testing conducted in a reverberation chamber are presented.

Research paper thumbnail of Optimisation of ground attenuation for moving sound sources

Applied Acoustics, 2006

ABSTRACT In an earlier study, Attenborough and Li [Attenborough K, Li, KM. Ground effect for A-we... more ABSTRACT In an earlier study, Attenborough and Li [Attenborough K, Li, KM. Ground effect for A-weighted noise in the presence of turbulence and refraction. J Acoust Soc Am 102:1997;1013–22] derived a closed form analytical formula to calculate optimum ground parameters for reducing the A-weighted noise due to a stationary point source. This paper extends this earlier study by deriving an expression to calculate the sound field due to a source moving at a constant speed above a ground surface. An A-weighted mean-square sound pressure has been derived that enables one to estimate the sound exposure levels of a moving source. Numerical calculations for a realistic range of speeds show the influence of the source motion on the noise levels. Although the predicted effects on the ground attenuation are moderate, they are significant at a relatively low Mach number. In addition, the sensitivity to the atmospheric turbulence and the geometrical parameters tends to be altered by the source motion. On the other hand, it is demonstrated that the optimum ground parameters are similar for stationary and moving sources.

Research paper thumbnail of Diffraction of sound due to moving sources by barriers and ground discontinuities

Journal of The Acoustical Society of America, 2006

The solution for diffraction of sound by a wedge is extended to sources in uniform motion paralle... more The solution for diffraction of sound by a wedge is extended to sources in uniform motion parallel to the obstacle. By means of an auxiliary transformation the problem is reduced to that of a set of stationary sources so that the resulting solution is in accordance with well-known models. Applications to prediction and abatement of transportation noise are considered. The formulation for the diffracted wave is combined with the solution for ground reflection of sound due to moving sources. New models for the sound field due to a source in motion along a barrier above the ground and for a source moving parallel to an impedance discontinuity are derived. In both situations, greater sensitivity to motion of the resulting sound pressure levels is found on source approach. However, attenuation of sound from moving sources by barriers is found to be so little affected by motion that design schemes for stationary source are relevant. On the other hand, it is noted that noise predictions must account for source motion.

Research paper thumbnail of Diffraction of sound from a dipole source near to a barrier or an impedance discontinuity

Journal of The Acoustical Society of America, 2003

Pierce's formulation for the diffraction of spherical waves by a hard wedge has been extended to ... more Pierce's formulation for the diffraction of spherical waves by a hard wedge has been extended to the case of the sound field due to a dipole source. The same approach is also used to extend a semiempirical model for sound propagation above an impedance discontinuity due to a dipole source. The resulting formulas have been validated by comparing their numerical solutions with that computed by summing the sound fields due to two closely spaced monopole sources of equal magnitude but opposite in phase. These new formulations are then used to develop a simple model for calculating the dipole sound field diffracted by a barrier above an impedance ground. Applications of these models relate to transportation noise prediction, particularly railway noise abatement, for which dipole sources are commonly used. The numerical predictions have been found to compare reasonably well with indoor measurements using piezoceramic transducers as dipole sources.

Research paper thumbnail of Predictions of Sound Due to a Moving Source Near Finite Impedance Ground

Research paper thumbnail of Development of a guideline for the assessment of low frequency noise in Victoria, Australia

Journal of the Acoustical Society of America, Sep 30, 2023

Research paper thumbnail of Optimisation of ground attenuation for moving sound sources

Applied Acoustics, Feb 1, 2006

ABSTRACT In an earlier study, Attenborough and Li [Attenborough K, Li, KM. Ground effect for A-we... more ABSTRACT In an earlier study, Attenborough and Li [Attenborough K, Li, KM. Ground effect for A-weighted noise in the presence of turbulence and refraction. J Acoust Soc Am 102:1997;1013–22] derived a closed form analytical formula to calculate optimum ground parameters for reducing the A-weighted noise due to a stationary point source. This paper extends this earlier study by deriving an expression to calculate the sound field due to a source moving at a constant speed above a ground surface. An A-weighted mean-square sound pressure has been derived that enables one to estimate the sound exposure levels of a moving source. Numerical calculations for a realistic range of speeds show the influence of the source motion on the noise levels. Although the predicted effects on the ground attenuation are moderate, they are significant at a relatively low Mach number. In addition, the sensitivity to the atmospheric turbulence and the geometrical parameters tends to be altered by the source motion. On the other hand, it is demonstrated that the optimum ground parameters are similar for stationary and moving sources.

Research paper thumbnail of Diffraction of sound due to moving sources by barriers and ground discontinuities

Journal of the Acoustical Society of America, Sep 1, 2006

Research paper thumbnail of A Metric Matrix Establishment for Cases Studies on the Effectiveness of the Key Environmental Protection Policies for Transportation Pollution Control

In a study of the Effectiveness of the Key Environmental Protection Policies for Road Traffic Noi... more In a study of the Effectiveness of the Key Environmental Protection Policies for Road Traffic Noise Control, the authors discussed 20 international case studies of road traffic and noise management. Although the key international environmental policies for road traffic noise control in developed countries are very technologically, economically, legally, and sociologically mature, these policies do not always result in compatible land use: roadways and highways are still built too close to existing residential areas, and vice versa. In China these issues are exacerbated due to its rapid urban growth and industrial expansion. In this paper, the authors expand their study to include non-noise policies (air pollution, public participation in the planning process, and other important factors) but the noise & vibration are the first impact metrics (e.g. airport, railway, shipping), and suggest a multi-dimensional matrix for such cases studies. At last, an airport case in China is employed...

Research paper thumbnail of Long-Term Asphalt Trial: Results of Acoustic Tests After Three Years

Acoustics Australia, Jul 14, 2016

In 2013, VicRoads initiated a long-term trial to investigate the acoustic performance of various ... more In 2013, VicRoads initiated a long-term trial to investigate the acoustic performance of various asphalt pavements constructed as variations to the standard specification for Victorian roads (Simpson et al. in Proceedings of the 26th Australian Road Research Board (ARRB) conference, Sydney, Australia, 2014). Acoustic testing of these five variations included statistical pass-by tests, as well as close proximity (ISO/DIS 11819-2 in Acoustics-measurement of the influence of road surfaces on traffic noise-Part 2: the close-proximity method, International Standard Organization, Geneva, 2013) and onboard sound intensity measurements (AASHTO TP 76-12 in Standard method of test for measurement of tire/pavement noise using the on-board sound intensity (OBSI) method. American Association of State Highway and Transportation Officials, Washington, 2012). The data collected from the most recent trials are presented along with that previously gathered over the first 3 years of the trial. The best-performing section of pavement was found to be a wearing surface that was treated by diamond grinding, and that showed a consistent improvement in noise reduction of up to 3 dB(A) over the standard open-graded asphalt.

Research paper thumbnail of New analytical models for outdoor moving sources of sound

Research paper thumbnail of Long-Term Asphalt Trial: Results of Acoustic Tests After Three Years

Acoustics Australia, 2016

Research paper thumbnail of Screening by edge-modified barriers of road traffic noise in high-rise buildings

Optimization of the acoustic performance of roadside noise barriers has been investigated from th... more Optimization of the acoustic performance of roadside noise barriers has been investigated from the 1980´s on in many different countries. In particular, France, Japan, the Netherlands and the U.K conducted extensive research and development for improving the acoustic performance of edge-modified barriers. Several supplemental algorithms to road traffic noise prediction schemes have been developed to account for edge-modified barriers. However, most of these studies only focused on the assessment of the screening performance in the shadow zone where the receivers are at relatively low heights. In the situation of high-rise cities, many noise sensitive receivers are located at significant heights where the attenuation due to a typical noise barrier is greatly reduced. This paper reports a numerical study to estimate the acoustic performance of the edgemodified barriers with four different profiles. The numerical simulations assess and compare the acoustic effectiveness of these edge-modified barriers at various receiver positions. a

Research paper thumbnail of Comparative assessment for low-noise pavements by means of the ISO 11819 and the OBSI

http://www.acoustics.asn.au/conference\_proceedings/INTERNOISE2014/papers/p412.pdf

Research paper thumbnail of Diffraction of Sound from a Dipole Source

An asymptotic approximation for the total sound field for an arbitrarily-orientated dipole placed... more An asymptotic approximation for the total sound field for an arbitrarily-orientated dipole placed above an impedance plane can be written in a form similar to the classical formula for a monopole. Pierce's calculation for the diffraction of spherical waves by a hard wedge has been adapted to the case of dipole sources. By using both of these results, a model for the calculation of the sound field due to a dipole source in the presence of a barrier on finite impedance ground is proposed. The predictions have been found to compare well with laboratory measurements.

Research paper thumbnail of Asphalt trials to reduce traffic noise levels

ABSTRACT This paper concerns a trial aimed at reducing traffic noise levels by means of low noise... more ABSTRACT This paper concerns a trial aimed at reducing traffic noise levels by means of low noise asphalt road pavement surfacings. The trial is being conducted on the Mornington Peninsula Freeway in Melbourne, Australia and includes seven different types of asphalt pavement surfaces which were laid in March 2013. The trial is a joint project involving VicRoads and Boral. Previous investigations in Australia had shown that the acoustic performance of conventional open graded asphalts (OGA) approached that of dense graded asphalts (DGA) after a few years. However, overseas studies have demonstrated that this deterioration in the acoustic performance of OGA could be reduced when OGA were constructed as double layers, at various depths and also when treatments, such as grinding, were applied to the surface. The trial pavement surfaces includes a conventional OGA, an OGA where the surface was treated using diamond grinding to provide a smoother surface whilst maintaining porosity, two sections of double layer OGA, a stone mastic asphalt (SMA) and two proprietary mixes. Road traffic noise generated on each trial section is being determined by the Statistical Pass-by Method, by the Close Proximity Method and by the On Board Sound Intensity Method. The acoustic performances of the trial pavement surfaces will be determined by these methods over a five year period. The paper summarises the planning, design and construction of the trial sections and presents part of the acoustic performance and asphalt testing results of the trial over the initial year.

Research paper thumbnail of Application of Quadratic Residue Diffusers to Transportation Noise Control

While Quadratic residue diffusers (QRD or Schroeder diffusers) have been used in architectural ac... more While Quadratic residue diffusers (QRD or Schroeder diffusers) have been used in architectural acoustics for some time, investigation into the use of diffusive devices on a barrier top for transportation noise abatement is fairly recent. Their potential resides in their high scattering effectiveness that can be tuned to a desired frequency range. Use of QRDs as noise reducers placed on top of noise barriers was investigated at the University of Salford. BEM simulations and scale model measurements have shown the relevance of such devices. On this basis Supreme Environmental Research (Shenzhen) Ltd. developed a line of innovative barrier caps designed to be effective in the low to mid frequency range where normal barrier attenuation is moderate while contribution to A-weighted levels is significant. Measurements at a controlled outdoor site have proven the effectiveness of the noise reducers. They were adopted by the Mass Transit Railway Corporation in Hong Kong as the noise mitigati...

Research paper thumbnail of Hybrid sound absorbers combining micro-perforated panels with conventional absorption mechanisms

The Journal of the Acoustical Society of America, 2012

Combination of microperforated panels with optimised efficiency in the low frequency range and ot... more Combination of microperforated panels with optimised efficiency in the low frequency range and other sound absorption systems that provide performance in the mid and high frequencies is presented for two sound absorber designs. In the first instance, proprietary fabric cover and fibrous absorption have been used to extend the performance range of discrete microperforated absorber units by optimising sound absorption by the edge of the units. The second development consists of conventional Helmholtz resonator perforated panels that have been customised using a micro-perforated panel in view to tune and enhance the low frequency performance. Results of testing conducted in a reverberation chamber are presented.

Research paper thumbnail of Optimisation of ground attenuation for moving sound sources

Applied Acoustics, 2006

ABSTRACT In an earlier study, Attenborough and Li [Attenborough K, Li, KM. Ground effect for A-we... more ABSTRACT In an earlier study, Attenborough and Li [Attenborough K, Li, KM. Ground effect for A-weighted noise in the presence of turbulence and refraction. J Acoust Soc Am 102:1997;1013–22] derived a closed form analytical formula to calculate optimum ground parameters for reducing the A-weighted noise due to a stationary point source. This paper extends this earlier study by deriving an expression to calculate the sound field due to a source moving at a constant speed above a ground surface. An A-weighted mean-square sound pressure has been derived that enables one to estimate the sound exposure levels of a moving source. Numerical calculations for a realistic range of speeds show the influence of the source motion on the noise levels. Although the predicted effects on the ground attenuation are moderate, they are significant at a relatively low Mach number. In addition, the sensitivity to the atmospheric turbulence and the geometrical parameters tends to be altered by the source motion. On the other hand, it is demonstrated that the optimum ground parameters are similar for stationary and moving sources.

Research paper thumbnail of Diffraction of sound due to moving sources by barriers and ground discontinuities

Journal of The Acoustical Society of America, 2006

The solution for diffraction of sound by a wedge is extended to sources in uniform motion paralle... more The solution for diffraction of sound by a wedge is extended to sources in uniform motion parallel to the obstacle. By means of an auxiliary transformation the problem is reduced to that of a set of stationary sources so that the resulting solution is in accordance with well-known models. Applications to prediction and abatement of transportation noise are considered. The formulation for the diffracted wave is combined with the solution for ground reflection of sound due to moving sources. New models for the sound field due to a source in motion along a barrier above the ground and for a source moving parallel to an impedance discontinuity are derived. In both situations, greater sensitivity to motion of the resulting sound pressure levels is found on source approach. However, attenuation of sound from moving sources by barriers is found to be so little affected by motion that design schemes for stationary source are relevant. On the other hand, it is noted that noise predictions must account for source motion.

Research paper thumbnail of Diffraction of sound from a dipole source near to a barrier or an impedance discontinuity

Journal of The Acoustical Society of America, 2003

Pierce's formulation for the diffraction of spherical waves by a hard wedge has been extended to ... more Pierce's formulation for the diffraction of spherical waves by a hard wedge has been extended to the case of the sound field due to a dipole source. The same approach is also used to extend a semiempirical model for sound propagation above an impedance discontinuity due to a dipole source. The resulting formulas have been validated by comparing their numerical solutions with that computed by summing the sound fields due to two closely spaced monopole sources of equal magnitude but opposite in phase. These new formulations are then used to develop a simple model for calculating the dipole sound field diffracted by a barrier above an impedance ground. Applications of these models relate to transportation noise prediction, particularly railway noise abatement, for which dipole sources are commonly used. The numerical predictions have been found to compare reasonably well with indoor measurements using piezoceramic transducers as dipole sources.