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Measurement Uncertainty in Random-Incidence Sound Absorption Testing: Part 2-Verification
Technical Paper
2007-01-2218
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Random-incidence sound absorption test results are not typically presented with appropriate estimates of uncertainty attached. A formulation for measurement uncertainty of random-incidence sound absorption testing per ASTM C423 was developed in Part 1. It resulted in a confidence interval on the absorption coefficient. This follow-up paper deals with the experimental verification of the uncertainty estimates in the absorption coefficient. Purposefully-designed measurement routines were executed that show the repeatability and reproducibility of three measurement schemes in various sized reverberation rooms. Results illustrate the testing methods which show agreement with the uncertainty estimates. Test reproducibility, found with roving sample position routines, agreed with the uncertainty estimates.
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Topic
Citation
Edwards, R. and Fung, K., "Measurement Uncertainty in Random-Incidence Sound Absorption Testing: Part 2-Verification," SAE Technical Paper 2007-01-2218, 2007, https://doi.org/10.4271/2007-01-2218.Also In
SAE 2007 Transactions Journal of Passenger Cars: Mechanical Systems
Number: V116-6; Published: 2008-08-15
Number: V116-6; Published: 2008-08-15
References
- American Society for Testing Materials (ASTM) Designation C423-02a “Standard Test Method for Sound Absorption and Absorption Coefficients by the Reverberation Room Method.”
- International Organization for Standardization (ISO) 354-2003 (E) “Acoustics - Measurement of Sound Absorption in a Reverberation Room.”
- Veen, J. R. Saha, P. “Feasibility of a Standardized Test Procedure for Random Incidence Sound Absorption tests Using a Small Size Reverberation Room,” Society of Automotive Engineers, SAE Paper 2003-01-1572 2003
- Veen, J. R. Saha, P. Jian, P. “Development of a Small Size Reverberation Room Standardized Test Procedure for Random Incidence Sound Absorption testing,” Society of Automotive Engineers, SAE Paper 2005-01-2284 2005
- Taylor, B. Kuyatt, C. “Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results,” United States National Institute of Standards and Technology NIST Technical Note 1297 1994
- Portier, E. Fohr, Francois Poulain, N. “Using Uncertainties to Qualify a Small Reverberation Chamber for Acoustic Absorption Coefficient Measurements,” Managing Uncertainties in Noise Measurement and Prediction LeMans, France June 2005
- Nabuco, M. Tenenbaum, R “Uncertainty in Sound Absorption Measurements In Diffuse Fields,” Managing Uncertainties in Noise Measurement and Prediction LeMans, France June 2005