Improvements in closed-section wind-tunnel beamforming experiments of acoustic sources distributed along a line
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.apacoust.2019.07.022 http://hdl.handle.net/11449/187917 |
Resumo: | Phased-array microphone techniques are widely used tools for the measurement and analysis of aeroacoustic noise sources. Nevertheless, beamforming results of sources distributed along a line, such as airfoil trailing-edge and slat, have not been entirely understood. This paper investigates the performance of beamforming methods in representing sources distributed along a line and estimating their spectral level. Conventional beamforming and the deconvolution techniques DAMAS and CLEAN-SC were employed for both synthetic and physical sources. The physical source is the slat of an MD30P30N high-lift model tested in a closed-section wind-tunnel with array microphones mounted flush to the tunnel wall. The synthetic source consisted of a large number of uncorrelated aligned monopole point sources. DAMAS was found to be the most accurate approach for both synthetic and physical test cases. The physical source results were not as accurate as the synthetic source ones, nevertheless, they were substantially improved by array shading and by an acoustic treatment (foam coating) on the working section walls. The most effective array shading methodology was based on the mean coherence level of each microphone, here referred to as CW (Coherence Weighting shading). |
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Improvements in closed-section wind-tunnel beamforming experiments of acoustic sources distributed along a lineAcoustic treatmentAligned acoustic sourcesArray shadingBeamformingCLEAN-SCDAMASReverberationPhased-array microphone techniques are widely used tools for the measurement and analysis of aeroacoustic noise sources. Nevertheless, beamforming results of sources distributed along a line, such as airfoil trailing-edge and slat, have not been entirely understood. This paper investigates the performance of beamforming methods in representing sources distributed along a line and estimating their spectral level. Conventional beamforming and the deconvolution techniques DAMAS and CLEAN-SC were employed for both synthetic and physical sources. The physical source is the slat of an MD30P30N high-lift model tested in a closed-section wind-tunnel with array microphones mounted flush to the tunnel wall. The synthetic source consisted of a large number of uncorrelated aligned monopole point sources. DAMAS was found to be the most accurate approach for both synthetic and physical test cases. The physical source results were not as accurate as the synthetic source ones, nevertheless, they were substantially improved by array shading and by an acoustic treatment (foam coating) on the working section walls. The most effective array shading methodology was based on the mean coherence level of each microphone, here referred to as CW (Coherence Weighting shading).Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)State University of Santa Catarina (UDESC), Rua Paulo Malschitzki, 200University of Sao Paulo (USP), Av. Trabalhador São-Carlense, 400, São CarlosSao Paulo State University (UNESP) Av. Professora Isette Corrêa Fontão 505, São João da Boa VistaSao Paulo State University (UNESP) Av. Professora Isette Corrêa Fontão 505, São João da Boa VistaCNPq: #141755/2012-1CAPES: #DS00011/07-0State University of Santa Catarina (UDESC)Universidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Amaral, Filipe Ramos dodo Carmo Pagani Junior, Carlos [UNESP]de Medeiros, Marcello Augusto Faraco2019-10-06T15:51:15Z2019-10-06T15:51:15Z2019-12-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article336-350http://dx.doi.org/10.1016/j.apacoust.2019.07.022Applied Acoustics, v. 156, p. 336-350.1872-910X0003-682Xhttp://hdl.handle.net/11449/18791710.1016/j.apacoust.2019.07.0222-s2.0-85069964624Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengApplied Acousticsinfo:eu-repo/semantics/openAccess2021-10-23T16:09:04Zoai:repositorio.unesp.br:11449/187917Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T22:04:42.863607Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Improvements in closed-section wind-tunnel beamforming experiments of acoustic sources distributed along a line |
title |
Improvements in closed-section wind-tunnel beamforming experiments of acoustic sources distributed along a line |
spellingShingle |
Improvements in closed-section wind-tunnel beamforming experiments of acoustic sources distributed along a line Amaral, Filipe Ramos do Acoustic treatment Aligned acoustic sources Array shading Beamforming CLEAN-SC DAMAS Reverberation |
title_short |
Improvements in closed-section wind-tunnel beamforming experiments of acoustic sources distributed along a line |
title_full |
Improvements in closed-section wind-tunnel beamforming experiments of acoustic sources distributed along a line |
title_fullStr |
Improvements in closed-section wind-tunnel beamforming experiments of acoustic sources distributed along a line |
title_full_unstemmed |
Improvements in closed-section wind-tunnel beamforming experiments of acoustic sources distributed along a line |
title_sort |
Improvements in closed-section wind-tunnel beamforming experiments of acoustic sources distributed along a line |
author |
Amaral, Filipe Ramos do |
author_facet |
Amaral, Filipe Ramos do do Carmo Pagani Junior, Carlos [UNESP] de Medeiros, Marcello Augusto Faraco |
author_role |
author |
author2 |
do Carmo Pagani Junior, Carlos [UNESP] de Medeiros, Marcello Augusto Faraco |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
State University of Santa Catarina (UDESC) Universidade de São Paulo (USP) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Amaral, Filipe Ramos do do Carmo Pagani Junior, Carlos [UNESP] de Medeiros, Marcello Augusto Faraco |
dc.subject.por.fl_str_mv |
Acoustic treatment Aligned acoustic sources Array shading Beamforming CLEAN-SC DAMAS Reverberation |
topic |
Acoustic treatment Aligned acoustic sources Array shading Beamforming CLEAN-SC DAMAS Reverberation |
description |
Phased-array microphone techniques are widely used tools for the measurement and analysis of aeroacoustic noise sources. Nevertheless, beamforming results of sources distributed along a line, such as airfoil trailing-edge and slat, have not been entirely understood. This paper investigates the performance of beamforming methods in representing sources distributed along a line and estimating their spectral level. Conventional beamforming and the deconvolution techniques DAMAS and CLEAN-SC were employed for both synthetic and physical sources. The physical source is the slat of an MD30P30N high-lift model tested in a closed-section wind-tunnel with array microphones mounted flush to the tunnel wall. The synthetic source consisted of a large number of uncorrelated aligned monopole point sources. DAMAS was found to be the most accurate approach for both synthetic and physical test cases. The physical source results were not as accurate as the synthetic source ones, nevertheless, they were substantially improved by array shading and by an acoustic treatment (foam coating) on the working section walls. The most effective array shading methodology was based on the mean coherence level of each microphone, here referred to as CW (Coherence Weighting shading). |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-06T15:51:15Z 2019-10-06T15:51:15Z 2019-12-15 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.apacoust.2019.07.022 Applied Acoustics, v. 156, p. 336-350. 1872-910X 0003-682X http://hdl.handle.net/11449/187917 10.1016/j.apacoust.2019.07.022 2-s2.0-85069964624 |
url |
http://dx.doi.org/10.1016/j.apacoust.2019.07.022 http://hdl.handle.net/11449/187917 |
identifier_str_mv |
Applied Acoustics, v. 156, p. 336-350. 1872-910X 0003-682X 10.1016/j.apacoust.2019.07.022 2-s2.0-85069964624 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Applied Acoustics |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
336-350 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129390121320448 |