New Experimental System to Determine Sound Transmission Loss of Sound Packages for 2d and 3d Automotive Body-Parts
SAE-PP-00307
11/7/2022
- Content
- Acoustic materials represent one of the major aspects for human comfort in the vehicles development. The ensemble of add-on materials (Sound Packages) as well as vehicle structural dynamics optimization represents the ensemble of NVH (Noise, Vibration and Harshness) tasks which are deeply investigated from the very beginning of vehicle development. Within NVH activities, the experimental evaluation of acoustic characteristics of Sound Packages, once coupled with corresponding body-parts, represent a major problem of test definition, boundaries condition and reliability. Typical test on Sound Packages focus on Sound Absorption and Sound Insulation but the test methods do not strictly relay on existing Standards because they do not define procedures and test conditions for samples with small area and 3d geometries (not flat). Along with progress in auto-parts design, several specific test have been developed and adopted in automotive world, today are also extended on the whole world of transportation means (Train, Ships, Aircraft) but the argument is still on-going and in this work we examine and present a possible solution for testing small elements (about 1m2) for Sound Insulation. The original approach of the presented method for Transmission Loss determination of small samples and 3d geometries is based on the ratio of Sound Energy instead of Sound Pressures between two arbitrary volume cavities. That includes the understanding and control of boundaries conditions, a parallel comparison with theoretical calculation and a comparison of results with some ISO International standards for the case of flat samples.
- Citation
- Amadasi, G., Bevilacqua, A., and IANNACE, G., "New Experimental System to Determine Sound Transmission Loss of Sound Packages for 2d and 3d Automotive Body-Parts," SAE MobilityRxiv™ Preprint, submitted November 7, 2022, https://doi.org/10.47953/SAE-PP-00307.