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Improving Tube Sound Transmission Loss Measurements Using the Transfer Matrix Technique to Remove the Effect of Area Changes
Technical Paper
2015-01-2310
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The Sound Transmission Loss of automotive intake and exhaust components is commonly measured using the four microphone tube method per ASTM E2611 [1]. Often area adapters are used to match the component diameter to that of the tube apparatus. These area adapters affect the Sound Transmission Loss measurement, especially at very low frequencies. The use of the Transfer Matrix Technique to remove the effect of the area adapters is described. The improvements for step and cone area adapters are compared.
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Citation
Green, E., "Improving Tube Sound Transmission Loss Measurements Using the Transfer Matrix Technique to Remove the Effect of Area Changes," SAE Technical Paper 2015-01-2310, 2015, https://doi.org/10.4271/2015-01-2310.Also In
References
- ASTM E2611-09 Standard Test Method for Measurement of Normal Incidence Sound Transmission of Acoustical Materials Based on the Transfer Matrix Method ASTM International 2009
- Tao , Z , and Seybert , A. A Review of Current Technology for Measuring Muffler Transmission Loss SAE Technical Paper 2003-01-1653 10.4271/2003-01-1653
- Sundaram , S. , Malagi , S. , and Ahmed , S. A Deterministic Algorithm for Distributed Processing in a Vehicle Network SAE Technical Paper 2013-01-1181 2013 10.4271/2013-01-1181
- Munjal , M.L. Acoustics of Ducts and Mufflers with Application to Exhaust and Ventilation System Design John Wiley and Sons 1987
- Song , B.H. and Bolton , J.S. A Transfer Matrix Approach for Estimating the Characteristic Impedance and Wave Numbers of Limp and rigid Porous Materials JASA 107 3 1131 1152 2000