Modal Analysis of Multi-Material Resonator Elements for Acoustic Metamaterials
* Presenting author
Abstract:
Acoustic Metamaterials have introduced highly effective concepts to dampen vibrations with sub-wavelength elements, especially in the low frequency range. With advances in additive manufacturing, it is now possible to manufacture parts that are composed of multiple materials without any need for assembly. In this study, a previously investigated resonator design is extended with a visco-elastic insert in the spring section of the resonator element. Multiple variants with different insert geometries are designed and manufactured using MultiJet Modeling with two different photo-polymers. A variant without insert is also manufactured as a baseline for all comparisons. Multiple instances of each design are measured, utilizing a 3D-Laser-Scanning-Vibrometer. Initially, the general suitability of the rigid photopolymer is assessed and compared to resonators made from ABSplus and PLA with Fused Filament Fabrication. Subsequently, the multi-material variants are analyzed in detail regarding their modal behavior.