A Long-Tube Method for Field Determinations of Sound Absorption Coefficients | Zendy

E. Jones | Zendy; S. Edelman | Zendy; Albert London | Zendy

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A Long-Tube Method for Field Determinations of Sound Absorption Coefficients

Author(s) -

E. Jones,

S. Edelman,

Albert London

Publication year - 1950

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 187

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.1917210

Subject(s) - reverberation room , reverberation , noise reduction coefficient , acoustics , attenuation coefficient , absorption (acoustics) , architectural acoustics , room acoustics , tube (container) , field (mathematics) , materials science , electromagnetic reverberation chamber , electrical impedance , optics , mathematics , physics , engineering , porosity , electrical engineering , composite material , pure mathematics

To determine whether acoustical materials installed in Government buildings meet specifications of acoustical properties and to determine the effect of various methods of maintenance on the acoustical properties of acoustical materials, a modification of the familiar laboratory impedance tube has been adapted for field measurements of the absorption coefficient at 512 c.p.s. only. The absorption coefficient for reverberant sound is calculated on the basis of a semi‐empirical development described at the last meeting by A. London. The apparatus will be described and results of simulated field tests on several acoustic materials will be presented giving a comparison between the reverberation room measurement and the simulated field test as well as the standard deviation of several tests made on the same material. A means of allowing for the errors inherent in the method in calculating the absorption coefficient for reverberant sound will be indicated.

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