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학술저널
저자정보
조수호 (서울대학교) 신용창 (서울대학교) Choi Wonjae (Korea Research Institute of Standards and Science) Yoon Heonjun (Soongsil University) Youn Byeng D. (Seoul National University) 김미소 (성균관대학교)
저널정보
나노기술연구협의회 Nano Convergence Nano Convergence Vol.8 No.27
발행연도
2021.9
수록면
1 - 13 (13page)
DOI
10.1186/s40580-021-00277-4

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This study aims to investigate elastic wave localization that leverages defect band splitting in a phononic crystal with double defects through in-depth analysis of comparison of numerical and experimental results. When more than one defect is created inside a phononic crystal, these defects can interact with each other, resulting in a distinctive physical phenomenon from a single defect case: defect band splitting. For a phononic crystal consisting of circular-hole type unit cells in a thin aluminum plate, under A 0 (the lowest antisymmetric) Lamb waves, both numerical simulations and experiments successfully confirm the defect band splitting phenomenon via frequency response functions for the out-of-plane displacement calculated/measured at the double defects within a finite distance. Furthermore, experimental visualization of in-phase and out-of-phase defect mode shapes at each frequency of the?split defect bands is achieved and found to be in excellent agreement with the simulated results. Different inter-distance combinations of the?double defects reveal that the degree of the defect band splitting decreases with ?the?increasing distance due to weaker coupling between the defects. This work may shed light on engineering applications of a multiple-defect-introduced phononic crystal, including broadband energy harvesting, frequency detectors, and elastic wireless power transfer.

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