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The Effect of Edge Constraints on the Measurement of Automotive Sound Package Materials Using a Tube Apparatus
Technical Paper
2013-01-1942
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Using a tube apparatus, sound transmission loss measurements can be performed per ASTM E2611-09. Usually the intent of these measurements is to determine the sound transmission of an infinite sheet of material (i.e. the one-dimensional (1D) absorption) of a specific thickness. These results are used in simple room acoustics models and in finite element models. The tube measures the sound transmission loss of a round sample constrained within a tube which, due to edge constraint, can be quite different from the 1D transmission loss. This same issue is seen when measuring the sound absorption of material samples. The edge constraint effect is examined for automotive materials (sheet metal and vinyl barrier material) measured in a tube configured to measure transmission loss, and alternate mounting methods are investigated. The results are compared to theoretical results.
Citation
Green, E. and Frey, A., "The Effect of Edge Constraints on the Measurement of Automotive Sound Package Materials Using a Tube Apparatus," SAE Technical Paper 2013-01-1942, 2013, https://doi.org/10.4271/2013-01-1942.Also In
References
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- 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
- ASTM E1050-10 Standard Test Method for Impedance and Absorption of Acoustical Materials Using a Tube, Two Microphones, and a Digital Frequency Analysis System ASTM International 2010