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Area Acoustics and electroacoustics / Architectural acoustics

IEV ref801-31-09

en
Eyring absorption coefficient
sound power absorption coefficient attributed to a surface by the Eyring reverberation-time equation

Note – The Eyring reverberation-time equation is:

T= ( 24ln10 )V cSln( 1 α ¯ ) MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbbjxAHXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeqabiGaciGacaqadmaadaqaaqaaaOqaaiaadsfacqGH9aqpdaWcaaqaamaabmaabaGaaGOmaiaaisdacaaMc8UaaeiBaiaab6gacaaMc8UaaGymaiaaicdaaiaawIcacaGLPaaacaaMc8UaamOvaaqaaiabgkHiTiaadogacaWGtbGaaGPaVlaaykW7caqGSbGaaeOBaiaaykW7daqadaqaaiaaigdacqGHsisliiaacuWFXoqygaqeaaGaayjkaiaawMcaaaaaaaa@512B@

where:
T is the reverberation time
V is the volume of the room
c is the speed of sound in the contained air
S = Σ Si is the total area of surfaces of the room
α ¯ =Σ S i α i /S MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbbjxAHXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeqabiGaciGacaqadmaadaqaaqaaaOqaaiqbeg7aHzaaraGaey ypa0dccaGae83Odm1aaSGbaeaacaWGtbWaaSbaaSqaaiaadMgaaeqa aOGaeqySde2aaSbaaSqaaiaadMgaaeqaaaGcbaGaam4uaaaaaaa@3F41@ is the area-weighted mean Eyring coefficient of all the surfaces
Si is the area of the i-th surface
αi is Eyring sound power absorption coefficient attributed to the i-th surface. The equivalent absorption area of the i-th surface is Siαi.


fr
facteur d'absorption d'Eyring, m
facteur d'absorption acoustique attribué à une surface et relié à la durée de réverbération par la formule d'Eyring

Note – La formule d'Eyring s'écrit:

T= ( 24ln10 )V cSln( 1 α ¯ ) MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbbjxAHXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeqabiGaciGacaqadmaadaqaaqaaaOqaaiaadsfacqGH9aqpdaWcaaqaamaabmaabaGaaGOmaiaaisdacaaMc8UaaeiBaiaab6gacaaMc8UaaGymaiaaicdaaiaawIcacaGLPaaacaaMc8UaamOvaaqaaiabgkHiTiaadogacaWGtbGaaGPaVlaaykW7caqGSbGaaeOBaiaaykW7daqadaqaaiaaigdacqGHsisliiaacuWFXoqygaqeaaGaayjkaiaawMcaaaaaaaa@512B@

où:
T est la durée de réverbération
V est le volume de la salle
c est la célérité du son dans l'air contenu dans la salle
S = Σ Si est l'aire totale des surfaces de la salle
α ¯ =Σ S i α i /S MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbbjxAHXgarqqtubsr4rNCHbGe aGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaq Fn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpe WZqaaeqabiGaciGacaqadmaadaqaaqaaaOqaaiqbeg7aHzaaraGaey ypa0dccaGae83Odm1aaSGbaeaacaWGtbWaaSbaaSqaaiaadMgaaeqa aOGaeqySde2aaSbaaSqaaiaadMgaaeqaaaGcbaGaam4uaaaaaaa@3F41@ est le facteur d'Eyring moyen pour toutes les surfaces
Si est l'aire de la surface de rang i
αi est le facteur d'absorption acoustique (d'Eyring) attribué à la surface de rang i. L'aire d'absorption équivalente de la surface de rang i est Siαi.


ar
معامل إيرينج للإمتصاص

de
Eyringscher Absorptionsgrad, m

es
factor de absorción de Eyring

fi
Eyringin absorptiosuhde

it
coefficiente di assorbimento secondo Eyring

ko
아이링 흡수계수

ja
アイリング吸音率

pl
współczynnik pochłaniania dźwięku Eyringa

pt
factor de absorção de Eyring

sv
Eyrings absorptionsfaktor

Publication date: 1994-07
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