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Alternative Sample Mounting Techniques for Small Reverberant Chambers
Technical Paper
2003-01-1579
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper reviews an alternative approach for mounting flat absorptive samples in small reverberant chambers, which improves the accuracy of random incidence sound absorption measurements.
A square recessed cavity is proposed, which allows flat test samples to be flush mounted to the floor of the chamber. This design feature eliminates acoustical measurement errors caused by diffraction effects at the edges of the samples, which are particularly pronounced in small reverberant chambers.
Random incidence sound absorption data are presented for fibrous and cellular flat acoustical insulation samples placed on the floor, and compared with data produced when those same samples were mounted using the flush mount system in a small reverberant chamber. The sample edge diffraction effects are quantified over a frequency range of 250 - 10,000 Hz.
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Wentzel, R., Boyd, R., Sampath, A., and Tompson, G., "Alternative Sample Mounting Techniques for Small Reverberant Chambers," SAE Technical Paper 2003-01-1579, 2003, https://doi.org/10.4271/2003-01-1579.Also In
SAE 2003 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V112-6; Published: 2004-09-15
Number: V112-6; Published: 2004-09-15
References
- Chappuis Andre Interkeller AG. - Smaller Size Devices for Accurate Acoustical Measurements of Materials and Parts used in Automobiles SAE proceedings, Paper 93126 15 25
- American Standard for Testing and Materials (ASTM) Designation C423-99a Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
- Schroeder M.R. New Method of Measuring Reverberation Time J. Acoust. Soc. Am. 39 1965 409 412