Contribution
Characterization of the Acoustic Properties of Additively Manufactured Porous Structures
* Presenting author
Abstract:
Layer-based additive manufacturing techniques, such as laser powder bed fusion (PBF-LB), facilitate the production of complex porous structures that could have significant potential as acoustic absorbers in various applications. This study investigates the suitability of several periodic unit cell shapes with sizes of 5 mm and 10 mm, featuring densities ranging from 30 % to 80 %, all manufactured using PBF-LB from AlSi10Mg. A test rig based on the two-port method was utilized, allowing for the through-flow of tube samples. This approach enables the measurement of acoustic parameters, such as sound absorption, reflection, and transmission, even under flow conditions, while also assessing the flow resistance of the porous structures. The results demonstrate that both the geometric parameters of the unit cells, specifically size and relative density, and the flow within the tube significantly influence the acoustic properties of the additively manufactured structures.