期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 136, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2019.106516
关键词
Quasi-periodic structures; Band diagram; Frequency stop-band; Forced response; Metamaterials
资金
- European Union's Horizon 2020 research and innovation program under Marie Curie grant [675441]
- EUR EIPHI project [ANR 17-EURE-0002]
The periodic structures have various applications in vibroacoustic engineering fields since they introduce frequency band effects due to the periodic discontinuities in the geometrical or material configurations: this can lead to increased performances. This paper is focused on the analysis of quasi-periodic structures: instead of using strictly repeated patterns, a certain degree of irregularity is introduced. Quasi-periodic lattices are defined as assemblies of two different elements in two directions. The assembly follows a Thue- Morse Morphism sequence which results in asymmetry in both directions. Numerical studies and experimental measurements on two-dimensional periodic and quasi-periodic lattices are thus performed. First validations are carried out by comparing the quasi- periodic lattice modelled by using finite element model with a prototype manufactured by laser machine. The wave characteristics in quasi-periodic lattice introduce elements of novelty for designing wider frequency stop bands in low frequency ranges. (C) 2019 Elsevier Ltd. All rights reserved.
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