Broad elastic wave attenuation in locally resonant metamaterial damped by particle dampers embedded via selective laser melting

Abstract

This study proposes local resonant metamaterials with lossy resonatros fabricated by selective laser melting; selective laser melting can embed particle dampers to closed spaces within the structures during fabrication process. Toward this end, the frequency- and acceleration-dependent damping properties of the particle dampers are first identified via the vibration testing. Subsequently, wave propagation within the metamaterial is analyzed using the dispersion analysis, which suggest that the damping properties by particle dampers can attenuate wave propagation in wide frequency ranges by combining the effects of local resonance and the particle dampers. Finally, the frequency response functions of the metamaterials are experimentally measured; the results confirm that particles can suppress vibrations in wide frequency ranges.