The uncertainty of the sound absorption coefficient is investigated by a thorough analysis of interlaboratory test data. Assuming a linear relationship between the standard deviation of reproducibility and the sound absorption coefficient, an estimate for the uncertainty is derived which depends also on frequency. Additionally, a realistic estimate for the standard deviation of repeatability is given. The same basic model turned out to be applicable to the sound absorption coefficient in one-third octave bands and to the weighted sound absorption coefficient. Finally it is shown how these findings can be extended to the uncertainty of the equivalent absorption area.
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Themenbereich der Metrologie
Akustik, Ultraschall, Beschleunigung
Zitierung
Wittstock, V. (2018). Determination of measurement uncertainties in building acoustics by interlaboratory tests. Part 2: Sound absorption measured in reverberation rooms. Acta Acustica united with Acustica, 104, 999–1008. https://doi.org/10.3813/aaa.919266
