Modeling a representative room to explore standard sound measurement methods for ASTM Impact Sound Rating testing

Abstract

ASTM ISR (Impact Sound Rating) test method suffers from non-reproducibility problems, especially in lower frequency bands in smaller rooms where the sound field is non-diffuse. The problem arises from the fact that Sound Pressure Level is measured in these rooms, which is dependent on the room dimensions if the sound field is non-diffuse due to low modal density. Currently, this non-diffusivity is ignored leading to non-reproducibility issues. In this work, we explore the ASTM standard discrete method, ISO discrete method, and the ISO corner method for sound measurement. We also explore the sound power computation using intensity measurements and the diagonal microphone measurement method. This initial work will be followed by exploring more simulation methods and real world testing on practical structures.