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samenvatting Akoestiek 2: H4: akoestische absorptie en nagalm
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samenvatting Akoestiek 2: hoofdstuk 4: akoestische absorptie en nagalm
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Akoestiek2022-2023: Pieter SCHEVENELS
Hoofdstuk 4_akoestische absorptie & nagalm
INHOUD
Nagalm ................................................................................................................................................... 2
• Gevolgen..................................................................................................................................... 2
Grootheden ............................................................................................................................................ 2
• Coëfficiënten .............................................................................................................................. 2
− Reflec�ecoëfficiënt ρ .............................................................................................................. 2
− Transmissiecoëfficiënt τ .......................................................................................................... 2
− Absorp�ecoëfficiënt α ........................................................................................................... 2
• Absorp�ecoëfficiënt α ................................................................................................................ 2
• Nagalm�jd T berekenen.............................................................................................................. 3
Normen en richtwaarden ....................................................................................................................... 3
• NBN S01-400 .............................................................................................................................. 3
• Akoes�sche capaciteit N ............................................................................................................. 4
Absorberende materialen ...................................................................................................................... 4
• Massa-absorbers / poreuze absorbers ....................................................................................... 4
− Massa-absorbers op de markt ................................................................................................ 4
• Holte-absorbers / Helmholtzresonatoren ................................................................................... 5
• Paneelabsorbers (membranen) .................................................................................................. 5
• Aandachtspunten ....................................................................................................................... 5
Interac�e met andere domeinen............................................................................................................ 5
Pagina 1 van 5
, Nagalm
= Lang heen- & weer blijven kaatsen v. geluidsgolven tegen ruimtebegrenzingen
• Gevolgen
− Geluid blij� hangen
− Spraakverstaanb.h. ↓
− Lawaaierigh. ↑
Grootheden
• Coëfficiënten
− Reflec�ecoëfficiënt ρ
· Geluid w weerkaatst: 𝐼𝐼𝑟𝑟
𝐼𝐼𝑟𝑟
· 𝜌𝜌 =
𝐼𝐼𝑖𝑖
− Transmissiecoëfficiënt τ
· Geluid gaat er door: 𝐼𝐼𝑡𝑡
𝐼𝐼𝑡𝑡
· τ= 𝐼𝐼𝑖𝑖
− Absorp�ecoëfficiënt α
· Geluid w geabsorbeerd = w omgezet in warmte: 𝐼𝐼𝑎𝑎
𝐼𝐼𝑎𝑎
· 𝛼𝛼 =
𝐼𝐼𝑖𝑖
Behoud v. energie: 𝐼𝐼𝑖𝑖 = 𝐼𝐼𝑟𝑟 + 𝐼𝐼𝑡𝑡 + 𝐼𝐼𝑎𝑎
𝜌𝜌 + 𝜏𝜏 + 𝛼𝛼 = 1
• Absorp�ecoëfficiënt α
− Geluidsabsorp�e vs. -isola�e
· -absorp�e: controleren v. nagalm in 1 ruimte
· -isola�e: verhinderen v. geluidoverdracht tss 2 ruimtes
− W bepaald in labo
· Nagalmkamer: leeg vs. 10-12m2 mat. in ruimte = absorp�e
· Absorp�e ↑ bij hogere frequen�es: korte golflengtes w meer verhinderd door mat.
− Ééngetalswaarde αw – wegingscurve
· Aflezen αw bij 500 Hz op wegingscurve
· Toch meer info?
Toevoegen L / M / H
Aanduiding of mat. beter/slechter absorbeert bij lage/middelhoge/hoge tonen
Pagina 2 van 5
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