2D Sonic Acoustic Barrier Composed of Multiple-Row Cylindrical Scatterers: Analysis with 1:10 Scaled Wooden Models

Theory regarding metamaterials was developed in the 1960s, aiming to control propagation of electromagnetic waves. Under this scope, research has been focused on realization materials having specific characteristics be invisible and optics fields. These principles have expanded only recently acoustic sector, with capable controlling sound due interference effect between soundwaves periodic structural elements composing system. This paper deals attenuation analyzes a metamaterial barrier characterized by multiple rows different configurations. The variety configurations depends diameters wooden scatterers (i.e., 9 mm 15 mm) distance source closest edge 400 800 mm). Despite same height 300 scaled model, combination creating an highlights increase overall Insertion Loss (IL) broadened (instead sharp) band gap, captured 4 kHz 12.5 kHz.