GB/T 33620-2017: Translated English of Chinese Standard (GBT 33620-2017, GB/T33620-2017, GBT33620-2017): Textiles - Testing and evaluation of sound absorption property
https://www.chinesestandard.net, 2016 M09 24 - 13 pages
This Standard specifies the testing method and evaluation for sound absorption property of textiles. This Standard applies to textiles and their products, irrespective of material.
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Standard atmosphere for conditioning and testing
Results calculation and expression
Annex A Informative Calculation principle of sound absorption coefficient
absorption coefficient test air layer thickness arithmetic mean atmosphere for conditioning automotive interior Calculate the arithmetic Calculation principle characterized by sound Click the button coefficient at normal conditioning and testing connected to Channel deviation diagram of testing diameter impedance tube distance between microphone equation A.3 Evaluation on sound Figure A.1 Frequency analyzer GB/T groups of specimens Impedance tube According incident sound inner diameter Insert the microphone instantaneous value microphone connected microphone mismatch correction Microphone position diagram normal incidence panels for automotive plane wave Power amplifier principle of sound purchaser via negotiation random noise reference plane referenced document shown in equation signal slot sound absorption coefficient sound absorption performance sound absorption property sound calibrator sound pressure level Sound-absorbing panels sound-absorbing performance speaker specimen surface Specimen tube standard atmosphere Terms and definitions test frequency range test results testing device Textiles three groups total sound transfer function Wall cloth