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Chiral trabeated metabeam for low-frequency multimode wave mitigation via dual-bandgap mechanism SCIE SCOPUS

Title
Chiral trabeated metabeam for low-frequency multimode wave mitigation via dual-bandgap mechanism
Authors
PARK, JEONGHOONLEE, DONGWOOJANG, YEONGTAELEE, ANNARHO, JUNSUK
Date Issued
2022-07
Publisher
NATURE PUBLISHING GROUP
Abstract
AbstractAn elastic wave in a physical beam naturally possesses many wave modes, such as flexural, longitudinal, and torsional. Therefore, suppression of all possible vibration modes has been rarely achieved in beam-shaped periodic systems, especially at low frequencies. Here we present a low-frequency complete bandgap mechanism by overlapping the flexural bandgap with the longitudinal-torsional bandgap. To strengthen the general framework, we enforce an extra degree of freedom (rotational and torsional-spring) on the spring-mass system for the flexural and coupled (longitudinal-torsional) modes. The low rotational stiffness provides a low flexural bandgap, whereas the torsional stiffness yields a coupled-mode bandgap. To meet these prerequisites in physical modeling, a chiral trabeated metabeam is conceived, which allows all wave modes to be suppressed by a complete bandgap. Apart from single-mode mitigation, our work provides a route to implementing a low-frequency complete bandgap in a periodic fashion, potentially enabling the use of chirality in elastic structures.
URI
https://oasis.postech.ac.kr/handle/2014.oak/113853
DOI
10.1038/s42005-022-00974-4
ISSN
2399-3650
Article Type
Article
Citation
Communications Physics, vol. 5, no. 1, 2022-07
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노준석RHO, JUNSUK
Dept of Mechanical Enginrg
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