The purpose of this SAE Recommended Practice is to provide guidelines for selection of transducers, data acquisition systems, and other instrumentation as well as analysis methods to help ensure proper measurement and evaluation of acoustic impulses in automobiles. While this Recommended Practice focuses on automotive inflatable devices, such as, frontal airbag systems, pretensioners, inflatable curtains, side airbags, etc., it can be used for measurement of other impulsive sounds in a vehicle if needed. The objective is to achieve uniformity in instrumentation practice and reporting of test measurements. Use of this recommended practice should provide a basis for meaningful comparisons of test results from different sources. This recommended practice specifies procedures for static measurement of acoustic impulses, but due to the much more complicated nature of crash testing, does not specify procedures for measuring impulses in vehicles during crash tests.
A complete review has been performed on this document. Numerous revisions were made to update the document with information developed since the last reaffirmation in 1987. Technological advances in instrumentation techniques, data acquisition methods, sensors and analysis techniques have been incorporated into this new revision. It is reasonable to consider this as a new document even though the number is the same and the goal of the document remains the same, nearly every section was revised according to state-of-the-art lab practice and instrumentation methods. After initial publication in November 2012, two issues came to light. The NOV2012 version had a broken hyperlink, and there was a typographical error in section 220.127.116.11.2.3. In this version of the Recommended Practice, the hyperlink was removed because the files to which it pointed are now included with the purchase of the Recommended Practice. The typographical errors were also amended.