Isolation of broad low-frequency flexural waves using phononic crystals with local resonances국부 공진 기반의 음향자 결정구조를 이용한 광대역 저주파수 굽힘파 절연

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For the past decades, phononic crystals have received much attention as a potential technique to isolate elastic waves in certain frequency ranges, called band gaps. Various works have been performed to broaden or lower the band gaps, but a challenge still remains on simultaneously broadening and lowering the band gap. In this study, we propose a unit cell of the phononic crystals that isolate the flexural waves in a broad and low frequency range by smoothly changing the thickness and width profiles of the unit cell. The broad and low band gap of the proposed unit cell is numerically and experimentally investigated, and the results show large wave attenuation (-10 dB to -35 dB) in the frequency range of about 2.2 Hz to 227.0 Hz. In addition, the band gap could be achieved by using the unit cells with the lattice constant of only 1/33 wavelength. We enhance the structural robustness of the proposed unit cell by replacing the surface region near the thin and narrow part with high-strength material while maintaining its broad low-frequency band gap.
Advisors
Jeon, Wonjuresearcher전원주researcher
Description
한국과학기술원 :기계공학과,
Publisher
한국과학기술원
Issue Date
2020
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학과, 2020.2,[ii, 25 p. :]

Keywords

Phononic crystals▼aBand gap▼aElastic wave▼aWave attenuation▼awave isolation; 음향자 결정구조▼a밴드 갭▼a탄성파▼a파동 감쇠▼a파동 절연

URI
http://hdl.handle.net/10203/283792
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=901523&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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