Development of a small-scale reverberant chamber for performing sound transmission loss tests

Detalhes bibliográficos
Autor(a) principal: Relva, Hugo Luís Oliveira Loureiro da Silva
Data de Publicação: 2023
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/40928
Resumo: The present work has the purpose of developing a small reverberant chamber that is suitable for performing sound transmission loss measurements of material samples. Initially, requirements for the chamber were defined and dimension and materials were selected based on the literature. A CAD model was created in order to define the assembly process. A simulation study was done using the I-Simpa software in order to evaluate the sound field diffusivity inside the chamber. Simulation showed good results, with only a variation in sound pressure of approximately 2 dB. However, experimental validation tests revealed that the chamber exhibited a modal behaviour in the frequency range between 200 and 500 Hz, which caused a significant variation in the sound field. Sound transmission loss tests performed on WPC samples showcased that the boards with oval holes performed the best regarding sound blocking. STL tests performed on geopolymer samples did not produce a significant difference in the results. Panel vibration tests revealed that they contributed to the modal behaviour of the sound field inside the chamber.
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spelling Development of a small-scale reverberant chamber for performing sound transmission loss testsAcousticsReverberant chamberSound transmission lossWood-plastic compositeSoundNoise reductionThe present work has the purpose of developing a small reverberant chamber that is suitable for performing sound transmission loss measurements of material samples. Initially, requirements for the chamber were defined and dimension and materials were selected based on the literature. A CAD model was created in order to define the assembly process. A simulation study was done using the I-Simpa software in order to evaluate the sound field diffusivity inside the chamber. Simulation showed good results, with only a variation in sound pressure of approximately 2 dB. However, experimental validation tests revealed that the chamber exhibited a modal behaviour in the frequency range between 200 and 500 Hz, which caused a significant variation in the sound field. Sound transmission loss tests performed on WPC samples showcased that the boards with oval holes performed the best regarding sound blocking. STL tests performed on geopolymer samples did not produce a significant difference in the results. Panel vibration tests revealed that they contributed to the modal behaviour of the sound field inside the chamber.O presente trabalho tem o objetivo de desenvolver uma pequena câmara reverberante que possa ser utilizada para realizar medições de perda por transmissão sonora de amostras de materiais. Inicialmente, foram definidos os requisitos a cumprir e foram selecionadas dimensões e materiais a partir da literatura. De seguida foi criado um modelo CAD, de modo a definir o processo de montagem. Foi realizada uma simulação utilizando o software I-Simpa com o objetivo de avaliar a difusividade do campo sonoro dentro da câmara. A simulação mostrou bons resultados, havendo apenas uma variação de pressão sonora de aproximadamente 2 dB. No entanto, os testes experimentais de validação, revelaram que a câmara exibia um comportamento modal na gama de frequências entre 200 e 500 Hz, o que causou uma variação significativa no campo sonoro. Os testes de perda por transmissão realizados com amostras de WPC permitiram identificar que as placas com ocos ovais internos têm um melhor desempenho quanto ao bloqueio de som. Os testes realizados com geopolímeros acoplados ao WPC não produziram uma diferença significativa nos resultados. Testes de vibração realizados aos painéis revelaram que estes contribuíam para o comportamento modal do campo sonoro dentro da câmara.2024-03-04T10:46:20Z2023-11-21T00:00:00Z2023-11-21info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10773/40928engRelva, Hugo Luís Oliveira Loureiro da Silvainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T01:46:42Zoai:ria.ua.pt:10773/40928Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:19:53.824947Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Development of a small-scale reverberant chamber for performing sound transmission loss tests
title Development of a small-scale reverberant chamber for performing sound transmission loss tests
spellingShingle Development of a small-scale reverberant chamber for performing sound transmission loss tests
Relva, Hugo Luís Oliveira Loureiro da Silva
Acoustics
Reverberant chamber
Sound transmission loss
Wood-plastic composite
Sound
Noise reduction
title_short Development of a small-scale reverberant chamber for performing sound transmission loss tests
title_full Development of a small-scale reverberant chamber for performing sound transmission loss tests
title_fullStr Development of a small-scale reverberant chamber for performing sound transmission loss tests
title_full_unstemmed Development of a small-scale reverberant chamber for performing sound transmission loss tests
title_sort Development of a small-scale reverberant chamber for performing sound transmission loss tests
author Relva, Hugo Luís Oliveira Loureiro da Silva
author_facet Relva, Hugo Luís Oliveira Loureiro da Silva
author_role author
dc.contributor.author.fl_str_mv Relva, Hugo Luís Oliveira Loureiro da Silva
dc.subject.por.fl_str_mv Acoustics
Reverberant chamber
Sound transmission loss
Wood-plastic composite
Sound
Noise reduction
topic Acoustics
Reverberant chamber
Sound transmission loss
Wood-plastic composite
Sound
Noise reduction
description The present work has the purpose of developing a small reverberant chamber that is suitable for performing sound transmission loss measurements of material samples. Initially, requirements for the chamber were defined and dimension and materials were selected based on the literature. A CAD model was created in order to define the assembly process. A simulation study was done using the I-Simpa software in order to evaluate the sound field diffusivity inside the chamber. Simulation showed good results, with only a variation in sound pressure of approximately 2 dB. However, experimental validation tests revealed that the chamber exhibited a modal behaviour in the frequency range between 200 and 500 Hz, which caused a significant variation in the sound field. Sound transmission loss tests performed on WPC samples showcased that the boards with oval holes performed the best regarding sound blocking. STL tests performed on geopolymer samples did not produce a significant difference in the results. Panel vibration tests revealed that they contributed to the modal behaviour of the sound field inside the chamber.
publishDate 2023
dc.date.none.fl_str_mv 2023-11-21T00:00:00Z
2023-11-21
2024-03-04T10:46:20Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10773/40928
url http://hdl.handle.net/10773/40928
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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