Vibration damping and acoustic behavior of PU-filled non-stochastic aluminum cellular solids

Detalhes bibliográficos
Autor(a) principal: Carneiro, Vítor Hugo Pimenta
Data de Publicação: 2021
Outros Autores: Puga, Hélder, Meireles, José F.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/73948
Resumo: Aluminum-based cellular solids are promising lightweight structural materials considering their high specific strength and vibration damping, being potential candidates for future railway vehicles with enhanced riding comfort and low fuel consumption. The filling of these lattices with polymer-based (i.e., polyurethane) foams may further improve the overall vibration/noise-damping without significantly increasing their density. This study explores the dynamic (i.e., frequency response) and acoustic properties of unfilled and polyurethane-filled aluminum cellular solids to characterize their behavior and explore their benefits in terms of vibration and noise-damping. It is shown that polyurethane filling can increase the vibration damping and transmission loss, especially if the infiltration process uses flexible foams. Considering sound reflection, however, it is shown that polyurethane filled samples (0.27–0.30 at 300 Hz) tend to display lower values of sound absorption coefficient relatively to unfilled samples (0.75 at 600 Hz), is this attributed to a reduction in overall porosity, tortuosity and flow resistivity. Foam-filled samples (43–44 dB at 700–1200 Hz) were shown to be more suitable to reduce sound transmission rather than reflection than unfilled samples (21 dB at 700 Hz). It was shown that the morphology of these cellular solids might be optimized depending on the desired application: (i) unfilled aluminum cellular solids are appropriate to mitigate internal noises due to their high sound absorption coefficient; and (ii) PU filled cellular solids are appropriate to prevent exterior noises and vibration damping due to their high transmission loss in a wide range of frequencies and vibration damping.
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spelling Vibration damping and acoustic behavior of PU-filled non-stochastic aluminum cellular solidsCellular solidsAluminum latticesVibration dampingNoise-dampingSound absorption coefficientTransmission lossScience & TechnologyAluminum-based cellular solids are promising lightweight structural materials considering their high specific strength and vibration damping, being potential candidates for future railway vehicles with enhanced riding comfort and low fuel consumption. The filling of these lattices with polymer-based (i.e., polyurethane) foams may further improve the overall vibration/noise-damping without significantly increasing their density. This study explores the dynamic (i.e., frequency response) and acoustic properties of unfilled and polyurethane-filled aluminum cellular solids to characterize their behavior and explore their benefits in terms of vibration and noise-damping. It is shown that polyurethane filling can increase the vibration damping and transmission loss, especially if the infiltration process uses flexible foams. Considering sound reflection, however, it is shown that polyurethane filled samples (0.27–0.30 at 300 Hz) tend to display lower values of sound absorption coefficient relatively to unfilled samples (0.75 at 600 Hz), is this attributed to a reduction in overall porosity, tortuosity and flow resistivity. Foam-filled samples (43–44 dB at 700–1200 Hz) were shown to be more suitable to reduce sound transmission rather than reflection than unfilled samples (21 dB at 700 Hz). It was shown that the morphology of these cellular solids might be optimized depending on the desired application: (i) unfilled aluminum cellular solids are appropriate to mitigate internal noises due to their high sound absorption coefficient; and (ii) PU filled cellular solids are appropriate to prevent exterior noises and vibration damping due to their high transmission loss in a wide range of frequencies and vibration damping.This work was supported by Fundação para a Ciência e a Tecnologia FCT under the research Doctoral Grant PD/BD/114096/2015, project UIDP/04077/2020 and UIDB/04436/2020, and Stimulus of Scientific Employment Application CEECIND/03991/2017.Multidisciplinary Digital Publishing Institute (MDPI)Universidade do MinhoCarneiro, Vítor Hugo PimentaPuga, HélderMeireles, José F.2021-04-282021-04-28T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/73948engCarneiro, V.H.; Puga, H.; Meireles, J. Vibration Damping and Acoustic Behavior of PU-Filled Non-Stochastic Aluminum Cellular Solids. Metals 2021, 11, 725. https://doi.org/10.3390/met110507252075-470110.3390/met11050725https://www.mdpi.com/2075-4701/11/5/725info: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:RCAAP2023-07-21T12:22:46Zoai:repositorium.sdum.uminho.pt:1822/73948Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:16:20.141414Repositório 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 Vibration damping and acoustic behavior of PU-filled non-stochastic aluminum cellular solids
title Vibration damping and acoustic behavior of PU-filled non-stochastic aluminum cellular solids
spellingShingle Vibration damping and acoustic behavior of PU-filled non-stochastic aluminum cellular solids
Carneiro, Vítor Hugo Pimenta
Cellular solids
Aluminum lattices
Vibration damping
Noise-damping
Sound absorption coefficient
Transmission loss
Science & Technology
title_short Vibration damping and acoustic behavior of PU-filled non-stochastic aluminum cellular solids
title_full Vibration damping and acoustic behavior of PU-filled non-stochastic aluminum cellular solids
title_fullStr Vibration damping and acoustic behavior of PU-filled non-stochastic aluminum cellular solids
title_full_unstemmed Vibration damping and acoustic behavior of PU-filled non-stochastic aluminum cellular solids
title_sort Vibration damping and acoustic behavior of PU-filled non-stochastic aluminum cellular solids
author Carneiro, Vítor Hugo Pimenta
author_facet Carneiro, Vítor Hugo Pimenta
Puga, Hélder
Meireles, José F.
author_role author
author2 Puga, Hélder
Meireles, José F.
author2_role author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Carneiro, Vítor Hugo Pimenta
Puga, Hélder
Meireles, José F.
dc.subject.por.fl_str_mv Cellular solids
Aluminum lattices
Vibration damping
Noise-damping
Sound absorption coefficient
Transmission loss
Science & Technology
topic Cellular solids
Aluminum lattices
Vibration damping
Noise-damping
Sound absorption coefficient
Transmission loss
Science & Technology
description Aluminum-based cellular solids are promising lightweight structural materials considering their high specific strength and vibration damping, being potential candidates for future railway vehicles with enhanced riding comfort and low fuel consumption. The filling of these lattices with polymer-based (i.e., polyurethane) foams may further improve the overall vibration/noise-damping without significantly increasing their density. This study explores the dynamic (i.e., frequency response) and acoustic properties of unfilled and polyurethane-filled aluminum cellular solids to characterize their behavior and explore their benefits in terms of vibration and noise-damping. It is shown that polyurethane filling can increase the vibration damping and transmission loss, especially if the infiltration process uses flexible foams. Considering sound reflection, however, it is shown that polyurethane filled samples (0.27–0.30 at 300 Hz) tend to display lower values of sound absorption coefficient relatively to unfilled samples (0.75 at 600 Hz), is this attributed to a reduction in overall porosity, tortuosity and flow resistivity. Foam-filled samples (43–44 dB at 700–1200 Hz) were shown to be more suitable to reduce sound transmission rather than reflection than unfilled samples (21 dB at 700 Hz). It was shown that the morphology of these cellular solids might be optimized depending on the desired application: (i) unfilled aluminum cellular solids are appropriate to mitigate internal noises due to their high sound absorption coefficient; and (ii) PU filled cellular solids are appropriate to prevent exterior noises and vibration damping due to their high transmission loss in a wide range of frequencies and vibration damping.
publishDate 2021
dc.date.none.fl_str_mv 2021-04-28
2021-04-28T00:00:00Z
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://hdl.handle.net/1822/73948
url http://hdl.handle.net/1822/73948
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Carneiro, V.H.; Puga, H.; Meireles, J. Vibration Damping and Acoustic Behavior of PU-Filled Non-Stochastic Aluminum Cellular Solids. Metals 2021, 11, 725. https://doi.org/10.3390/met11050725
2075-4701
10.3390/met11050725
https://www.mdpi.com/2075-4701/11/5/725
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.publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute (MDPI)
publisher.none.fl_str_mv Multidisciplinary Digital Publishing Institute (MDPI)
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
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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