Acoustic stop bands in almost-periodic and weakly randomized stratified media: perturbation analysis
Résumé
In this paper, we analyze the effect of both deterministic and random perturbations of a regular multi-layered elastic structure on its stop band properties. The tool of choice is the transfer matrix method, which is both versatile and easy to implement. In both cases, we find that the stop-bands widen.We observe the appearance of very narrowpass-bands within the stop-bands, which can be observed in other instances in optics.