This SAE Recommended Practice presents a test procedure for determining the airborne sound insulation performance of materials and composite layers of materials commonly found in mobility, industrial and commercial products under conditions of representative size and sound incidence so as to allow better correlation with in-use sound insulator performance. The frequency range of interest is typically 125 to 8000 Hz 1/3 octave band center frequencies.
This test method is designed for testing flat samples, although in some applications the methodology can be extended to evaluate formed parts, pass-throughs, or other assemblies to determine their acoustical properties. For non-flat parts or assemblies where transmitted sound varies strongly across the test sample surface, a more appropriate methodology would be ASTM E90 (with a reverberant receiving chamber) or ASTM E 2249 (intensity method with an anechoic or hemi-anechoic receiving chamber).
Rationale
This document defines alternative methods to ASTM E 90 and ASTM E 2249 for measuring sound transmission loss (STL) of noise control or other flat sample materials.
The Acoustical Materials Committee is dedicated to developing, coordinating, reviewing, approving, maintaining and revising documents related to ground vehicle noise and vibration control materials through the participation of material suppliers, part suppliers, system integrators, consultants, test laboratories and ground vehicle manufacturers. Committee activities shall provide a forum for the cooperative interchange of ideas and experience of the participants, resulting in the publication of Standards, Recommended Practices and Information Reports that embody established ground vehicle industry practices and requirements to serve the suppliers and customers of ground vehicle materials. At its discretion, the committee shall also sponsor and support SAE International technical meetings such as conferences, workshops and symposia to further the exchange of information and ideas.
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Laboratory Measurement of the Airborne Sound Barrier Performance of Flat Materials and Assemblies
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Laboratory Measurement of the Airborne Sound Barrier Performance of Flat Materials and Assemblies
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