Predicting theater chair absorption from reverberation chamber measurements - comment

Davies, WJ; Lam, YW; Orlowski, RJ

Abstract

The relationship between the measured acoustic absorption coefficient of an array of theater chairs and the ratio of the perimeter length to plan area of the array is considered. It is shown that the linear relationship measured by Bradley in a reverberation chamber and reported in ''Predicting theater chair absorption from reverberation chamber measurements'' [J. Acoust. Soc. Am. 91, 1514-1524 (1992)] is to be expected from simple theory. This means that any nonlinear influence of diffracted energy on the relationship is small. Bradley is also unduly harsh on the usefulness of a chair absorption measurement method involving screens. A sample result is given, showing that this method can predict in-situ theater chair absorption with reasonable accuracy.

Citation

Davies, W., Lam, Y., & Orlowski, R. (1993). Predicting theater chair absorption from reverberation chamber measurements - comment. ˜The œJournal of the Acoustical Society of America (Online), 93(4), 2238-2240. https://doi.org/10.1121/1.406687

• Journal Article Type: Article
• Publication Date: Apr 1, 1993
• Deposit Date: Dec 4, 2012
• Publicly Available Date: Apr 5, 2016
• Journal: The Journal of the Acoustical Society of America (JASA)
• Print ISSN: 0001-4966
• Peer Reviewed: Peer Reviewed
• Volume: 93
• Issue: 4
• Pages: 2238-2240
• DOI: https://doi.org/10.1121/1.406687
• Keywords: Seat absorption concert hall
• Publisher URL: http://dx.doi.org/10.1121/1.406687
• Additional Information: References : 1J. S. Bradley, "Predicting Theater Chair Absorption from Reverberation Chamber Measurements," J. Acoust. Soc. Am. 91, 1514 1524 (1992). 2U. Kath and W. Kuhl, "Messungen zur Schallabsorption von Polsterstühlen mit und ohne Personen," Acustica 15, 127 131 (1965). 3W. J. Davies and R. J. Orlowski, "Methods of Measuring the Acoustic Absorption of Auditorium Seating," Proceedings of the Institute of Acoustics (U.K.) 12(1), 299 306 (1990). 4E. D. Daniel, "On the Dependence of Absorption Coefficients upon the Area of the Absorbent Material," J. Acoust. Soc. Am. 35, 571 573 (1963). 5T. ten Wolde, "Measurements on the Edge Effect in Reverberation Rooms," Acustica 18, 207 212 (1967). 6H. Dekker, "Edge Effect Measurements in a Reverberation Room," J. Sound Vib. 32, 199 202 (1974). 7T. W. Bartel, "Effect of Absorber Geometry on Apparent Absorption Coefficients as Measured in a Reverberation Chamber," J. Acoust. Soc. Am. 69, 1065 1074 (1981). 8U. Kath and W. Kuhl, "Einfluss von Streufläche und Hallraumdimensionen auf den Gemessenen Schallabsorptionsgrad," Acustica 11, 50 64 (1961). 9U. Kath and W. Kuhl, "Messungen zur Schallabsorption von Personen auf Ungepolsterten Stühlen," Acustica 14, 50 55 (1964).