Abstract
Sound absorber "acoustic black hole", a kind of acoustic metamaterial, has been made in the new configuration to control three dimensional propagation of acoustic wave and tested in anechoic room. Acoustic black hole is composed "shell" and "core" and filling fraction of shell is important for acoustic propagation. In this study, filling fraction is controlled by number and size of bar made of PLA. Evaluation of its absorption is conducted from reflection and trasnmission calculated with sound pressure ratio around spherical structure. The result shows the new acoustic black hole can't improve efficient of absorption, but that it can considerably reduce reflection on the surface of absorber. Also, three dimensional refraction in new shell is confirmed, but concentration of acoustic wave behind acoustic black hole which the small refraction causes makes Noise Reduction worse.
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