Full text loading...
Measured (solid curves) and calculated (dashed curves) normal-incidence sound transmission of aluminum plates perforated with holes forming a square lattice (a)–(c) and a triangular lattice (d)–(f), for plate thickness , 3, and 5 mm. The period is and the hole diameter is in all cases. The hard-solid approximation has been used in the calculations.
Measured sound transmission as a function of normalized parallel wave vector and frequency for perforated aluminum plates with square (a)–(c) and triangular (d)–(f) lattice symmetry (see insets) and for different plate thicknesses . The period is and the hole diameter is in all cases. (g)–(i) show the transmission for homogeneous isotropic aluminum plates.
Phase speed for the -like mode below the crossing with the Wood anomaly for both square and triangular lattices.
Article metrics loading...