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IEVref: | 801-31-09 | ID: | |

Language: | en | Status: 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: $T=\frac{\left(24\text{\hspace{0.17em}}\text{ln}\text{\hspace{0.17em}}10\right)\text{\hspace{0.17em}}V}{-cS\text{\hspace{0.17em}}\text{\hspace{0.17em}}\text{ln}\text{\hspace{0.17em}}\left(1-\overline{\alpha}\right)}$
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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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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 *S*_{i} is the total area of surfaces of the room

$\overline{\alpha}=\text{\Sigma}{S}_{i}{\alpha}_{i}/S$ is the area-weighted mean Eyring coefficient of all the surfaces

*S*_{i} is the area of the *i*-th surface

*α*_{i} is Eyring sound power absorption coefficient attributed to the *i*-th surface. The equivalent absorption area of the *i*-th surface is *S*_{i}*α*_{i}.