Wave propagation in one-dimensional solidfluid quasi-periodic and aperiodic phononic crystals

摘要

The propagation of the elastic waves in one-dimensional (1D) solidfluid quasi-periodic phononic crystals is studied by employing the concept of the localization factor, which is calculated by the transfer matrix method. The solidfluid interaction effect at the interfaces between the solid and the fluid components is considered. For comparison, the periodic systems and aperiodic ThueMorse sequence are also analyzed in this paper. The splitting phenomenon of the pass bands and bandgaps are discussed for these 1D solidfluid systems. At last the influences of the material impedance ratios on the band structures of the 1D solidfluid quasi-periodic phononic crystals arranged as Fibonacci sequence are discussed.