Sound Attenuation of an Acoustic Barrier Made with Metamaterials
Metamaterials represent a new approach in applied acoustics and noise control fields, although the first studies of them date back to a half century ago to Viselago, and later to Pendry. In this paper, after a brief introduction to the state of art of metamaterials for acoustic applications, the sound attenuation of an acoustic barrier made following metamaterial rules is investigated. A 1:10 scale model was built using cylindrical wooden bars, 30 cm high and 1.5 cm in diameter. The total length of the barrier model was 100 cm. The barrier was investigated for four alternating rows of cylindrical bars, spacing each bar with an empty space to create different regular geometries. The insertion losses of each configuration are reported.
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