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Calibrating Reverberation Room for Accurate Material Sound Absorption Measurements
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Abstract
Comparing material sound absorption test results obtained from pressure decay time measurements from different laboratories is becoming increasingly difficult in the industry. Results often seen in the industry show different material sound absorption coefficient depending on the size and design of the reverberation room, the size of the of the material used in testing, and the type of equipment or method used in acquiring and processing data.
Now that material performance is determined by its ability to meet acoustical specifications set by the customer, usually the Original Equipment Manufacturers (OEMs), there must be a common and best practices that should be followed by suppliers and independent laboratories alike to insure that American Society For Testing and Materials (ASTM) C423 is done correctly.[1]* This paper addresses factors that affect sound absorption measurements based on a round robin testing of a generic acoustic material that was circulated between laboratories and offers ways to reduce differences in laboratory testing of the ASTM C423 for more accurate results.
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Citation
Nwankwo, O. and Szary, M., "Calibrating Reverberation Room for Accurate Material Sound Absorption Measurements," SAE Technical Paper 960191, 1996, https://doi.org/10.4271/960191.Also In
Advances in Component Designs for Noise and Vibration Control
Number: SP-1147; Published: 1996-02-01
Number: SP-1147; Published: 1996-02-01
References
- American Society for Testing and Materials (ASTM) Designation C423 Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
- ISO 364- 1985 “Acoustical Absorption Measurements”
- Kosten C.W. “International Comparison Measurements in the Reverberation Room” Acustica 10 400-411 1960
- Chappuis Andre Interkeller AG. “Small Size Devices for Accurate Acoustical Measurements of Materials and Parts used in Automobile” SAE Proceedings Paper 931266 15 25
- Eyring C.F. “Reverberation Time in Dead Rooms,” Journal of Acoustical Society of America 1 217 214 1930
- Millington G. “A Modified Formula for Reverberation,” Journal of Acoustical Society of America 4 69 82 1932
- Sette W. J. “A New Reverberation Time Formula,” Journal of Acoustical Society of America 4 193 210 1933
- Young R.W. “Sabine Reverberation Equation and Sound Power Calculations,” Journal of Acoustical Society of America 31 912 921 1959
- Daniel E.D.. “On the Dependence of Absorption Coefficients upon the Area of the absorbent Material,” Journal of Acoustical Society of America 35 571 573 1963