Effects of orientation and symmetry of rods on the complete acoustic band gap in two-dimensional periodic solid/gas systems

摘要

We study numerically the acoustic band structures of five different shapes of steel rods (regular triangle, square, hexagon, octagon prisms and columns) placed, respectively, in air with a square lattice. The dependences of the complete acoustic band gaps (CABGs) on the orientation of the above noncircular rods and the maximum of CABG on the rods' symmetry are discussed. (c) 2005 Elsevier B.V. All rights reserved.