Acoustic stop bands in almost-periodic and weakly randomized stratified media: perturbation analysis

• 来源期刊: 力学学报(英文版)
• 年，卷（期）: 2008,（5）
• 页码范围: 549-556
• 页数: 8页
• 语种: 英文
• DOI: 10.1007/s10409-008-0180-z

摘要

In this paper, we analyze the effect of both deter-ministic 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 narrow pass-bands within the stop-bands, which can be observed in other ins-tances in optics.