SAE J2846-2017
SAE J 2846-2010
Laboratory Measurement of the Acoustical Performance of Body Cavity Filler Materials
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- 标准号
- SAE J2846-2017
- 发布日期
- 2017年01月01日
- 实施日期
- 2017年01月01日
- 废止日期
- 无
- 中国标准分类号
- /
- 国际标准分类号
- /
- 发布单位
- SAE - SAE International
- 适用范围
- This SAE Recommended Practice describes a laboratory test procedure for measuring the acoustical performance of a system consisting of a body cavity filler material formed into a rectangular cross-section channel. Materials for this test may include both heat reactive and chemically reactive products@ with or without a shelf to simulate a baffle in an application@ or a combination of body cavity filler and aluminum foil to enhance the performance. These materials are commonly installed in transportation systems such as ground vehicles@ and thus reduce the noise propagation through the rails@ rockers@ and pillar/posts. This document is intended to rank order the acoustical performance of materials for application on channels using general automotive steel@ such that the effects of sealing of pinch welds in addition to the material could be easily evaluated. However@ the channel is not an actual part (i.e.@ real life section) of the vehicle@ and therefore results obtained from this study will have to be carefully interpreted considering limitations of section size/shape and full sealing (or not) of the section. The acoustical performance is expressed in terms of insertion loss (IL) which is described in Section 3 Test Method. The test procedure described here is based on the method described in SAE J1400. However@ this document differs from the SAE J1400 method in that the J1400 measures sound transmission loss@ and this document measures IL of body cavity materials in a cavity. This document covers the useful frequency range of interest in 1/3 octave band center frequencies. The lower limit of the actual frequency range is limited by the size of the channel and/or the volume of the reverberation room. Two rectangular cross-section channels are cited in this standard. These are 75 mm x 75 mm and 150 mm x 150 mm in cross-section and provide valid data at and above 800 Hz and 400 Hz 1/3 octave band frequencies@ respectively@ provided the reverberation room can generate diffuse sound field at those frequencies.