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IEVref:801-31-09ID:
Language:enStatus: Standard
Term: Eyring absorption coefficient
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Definition: 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.


Publication date:1994-07
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Internal notes:2017-06-02: Cleanup - Remove Attached Image 801-31-091.gif

2017-06-02: Cleanup - Remove Attached Image 801-31-092.gif
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