Comparison Failure and Successful Methodologies for Diffusion Measurements Undertaken inside Two Different Testing Rooms

The scattering phenomenon is known to be of great importance for the acoustic quality of a performance arts space. The scattering of sound can be achieved in different ways: it can be obtained by the presence of architectural and/or decorating elements inside a room (e.g., columns, statues), by the...

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Autores principales:	Lamberto Tronchin, Angelo Farina, Antonella Bevilacqua, Francesca Merli, Pietro Fiumana
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	scattering effect diffusion coefficient reflecting panels QRD ISO 17497 Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/8d3d0874073643cab87225481e35c12d
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id	oai:doaj.org-article:8d3d0874073643cab87225481e35c12d
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spelling	oai:doaj.org-article:8d3d0874073643cab87225481e35c12d2021-11-25T16:30:42ZComparison Failure and Successful Methodologies for Diffusion Measurements Undertaken inside Two Different Testing Rooms10.3390/app1122105232076-3417https://doaj.org/article/8d3d0874073643cab87225481e35c12d2021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10523https://doaj.org/toc/2076-3417The scattering phenomenon is known to be of great importance for the acoustic quality of a performance arts space. The scattering of sound can be achieved in different ways: it can be obtained by the presence of architectural and/or decorating elements inside a room (e.g., columns, statues), by the geometry and roughness of a surface (e.g., Quadratic Residue Diffuser (QRD)) and by the diffraction effect occurring when a sound wave hits the edges of an obstacle. This article deals with the surface scattering effects and the diffusion phenomenon only related to MDF and plywood panels tested by disposing the wells both horizontally and vertically. The test results undertaken inside a semi-reverberant room and inside a large reverberant room have been compared to highlight the success and the failure of the measuring methodologies. In detail, according to the existing standards and regulations (i.e., ISO 17497—Part 2), diffusion measurements have been undertaken on a few selected types of panel: two QRD panels (made of Medium Density Fiberboard (MDF) and plywood) with and without a smooth painted solid wood placed behind the QRD. The panels have been tested inside two rooms of different characteristics: a semi-anechoic chamber (Room A) and a large reverberant room (Room B). The volume size influenced the results that have been analyzed for both chambers, showing an overlap of reflections on panels tested inside Room A and a clear diffusion response for the panels tested inside Room B. In terms of the diffusion coefficient in all the octave bands between 125 Hz and 8 kHz, results should not be considered valid for panels tested in Room A because they were negatively impacted by extraneous reflections, while they are reliable for panels tested in Room B.Lamberto TronchinAngelo FarinaAntonella BevilacquaFrancesca MerliPietro FiumanaMDPI AGarticlescattering effectdiffusion coefficientreflecting panelsQRDISO 17497TechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10523, p 10523 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	scattering effect diffusion coefficient reflecting panels QRD ISO 17497 Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	scattering effect diffusion coefficient reflecting panels QRD ISO 17497 Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Lamberto Tronchin Angelo Farina Antonella Bevilacqua Francesca Merli Pietro Fiumana Comparison Failure and Successful Methodologies for Diffusion Measurements Undertaken inside Two Different Testing Rooms
description	The scattering phenomenon is known to be of great importance for the acoustic quality of a performance arts space. The scattering of sound can be achieved in different ways: it can be obtained by the presence of architectural and/or decorating elements inside a room (e.g., columns, statues), by the geometry and roughness of a surface (e.g., Quadratic Residue Diffuser (QRD)) and by the diffraction effect occurring when a sound wave hits the edges of an obstacle. This article deals with the surface scattering effects and the diffusion phenomenon only related to MDF and plywood panels tested by disposing the wells both horizontally and vertically. The test results undertaken inside a semi-reverberant room and inside a large reverberant room have been compared to highlight the success and the failure of the measuring methodologies. In detail, according to the existing standards and regulations (i.e., ISO 17497—Part 2), diffusion measurements have been undertaken on a few selected types of panel: two QRD panels (made of Medium Density Fiberboard (MDF) and plywood) with and without a smooth painted solid wood placed behind the QRD. The panels have been tested inside two rooms of different characteristics: a semi-anechoic chamber (Room A) and a large reverberant room (Room B). The volume size influenced the results that have been analyzed for both chambers, showing an overlap of reflections on panels tested inside Room A and a clear diffusion response for the panels tested inside Room B. In terms of the diffusion coefficient in all the octave bands between 125 Hz and 8 kHz, results should not be considered valid for panels tested in Room A because they were negatively impacted by extraneous reflections, while they are reliable for panels tested in Room B.
format	article
author	Lamberto Tronchin Angelo Farina Antonella Bevilacqua Francesca Merli Pietro Fiumana
author_facet	Lamberto Tronchin Angelo Farina Antonella Bevilacqua Francesca Merli Pietro Fiumana
author_sort	Lamberto Tronchin
title	Comparison Failure and Successful Methodologies for Diffusion Measurements Undertaken inside Two Different Testing Rooms
title_short	Comparison Failure and Successful Methodologies for Diffusion Measurements Undertaken inside Two Different Testing Rooms
title_full	Comparison Failure and Successful Methodologies for Diffusion Measurements Undertaken inside Two Different Testing Rooms
title_fullStr	Comparison Failure and Successful Methodologies for Diffusion Measurements Undertaken inside Two Different Testing Rooms
title_full_unstemmed	Comparison Failure and Successful Methodologies for Diffusion Measurements Undertaken inside Two Different Testing Rooms
title_sort	comparison failure and successful methodologies for diffusion measurements undertaken inside two different testing rooms
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/8d3d0874073643cab87225481e35c12d
work_keys_str_mv	AT lambertotronchin comparisonfailureandsuccessfulmethodologiesfordiffusionmeasurementsundertakeninsidetwodifferenttestingrooms AT angelofarina comparisonfailureandsuccessfulmethodologiesfordiffusionmeasurementsundertakeninsidetwodifferenttestingrooms AT antonellabevilacqua comparisonfailureandsuccessfulmethodologiesfordiffusionmeasurementsundertakeninsidetwodifferenttestingrooms AT francescamerli comparisonfailureandsuccessfulmethodologiesfordiffusionmeasurementsundertakeninsidetwodifferenttestingrooms AT pietrofiumana comparisonfailureandsuccessfulmethodologiesfordiffusionmeasurementsundertakeninsidetwodifferenttestingrooms
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Comparison Failure and Successful Methodologies for Diffusion Measurements Undertaken inside Two Different Testing Rooms

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