ASTM E966-2018 pdf free download

ASTM E966-2018 pdf free download.Standard Guide for Field Measurements of Airborne Sound Attenuation of Building Facades and Facade Elements
1. Scope
1.1 This guide may be used to determine the outdoor-indoor noise reduction (OINR), which is the difference in sound pressure level between the free-field level outdoors in the absence of the structure and the resulting sound pressure level in a room. Either a loudspeaker or existing traffic noise or aircraft noise can be used as the source. The outdoor sound field geometry must be described and calculations must ac- count for the way the outdoor level is measured. These results are used with Classification E1332 to calculate the single number rating outdoor-indoor noise isolation class, OINIC. Both OINR and OINIC can vary with outdoor sound incidence angle. 1.2 Under controlled circumstances where a single façade is exposed to the outdoor sound, or a façade element such as a door or window has much lower transmission loss than the rest ofthe façade, an outdoor-indoor transmission loss, OITL(θ), or apparent outdoor-indoor transmission loss, AOITL(θ), may be measured using a loudspeaker source. These results are a function of the angle of incidence of the sound field. By measuring with sound incident at many angles, an approxima- tion to the diffuse field transmission loss as measured between two rooms can be obtained. The results may be used to predict interior sound levels in installations similar to that tested when exposed to an outdoor sound field similar to that used during the measurement. The single number ratings of apparent outdoor-indoor transmission class, AOITC(θ), using AOITL(θ) and field outdoor-indoor transmission class, FOITC(θ), using OITL(θ) may be calculated using Classification E1332. These ratings also may be calculated with the data obtained from receiving room sound pressure measurements performed at several incidence angles as discussed in 8.6. 1.3 To cope with the variety of outdoor incident sound field geometries that are encountered in the field, six testing tech- niques are presented. These techniques and their general applicability are summarized in Table 1 and Figs. 1-6. The room, façade, or façade element declared to be under test is referred to as the specimen.1.4 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.7 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3.2.5 outdoor-indoor noise reduction, OINR or OINR(θ), dB, n—for a specified source angle of incidence or source sound distribution, the difference in a specified frequency band between the time average free-field sound pressure level at the exterior of a façade and the space-time average sound pressure level in a room of a building exposed to the outdoor sound through that façade. 3.2.5.1 Discussion—The outdoor-indoor noise reduction has been known previously in this guide as the outdoor-indoor level reduction, OILR. For measured data, the OINR (θ) may be used to indicate results at a specific angle (θ) as discussed in 8.5. ONIR may be used to indicate the weighted average of measurements over a range of angles as discussed in 8.6 or a measurement result due to exposure to a line source as discussed in Section 9.