Research on the Band Gap Characteristics of Two-Dimensional Phononic Crystals Microcavity with Local Resonant Structure

A new two-dimensional locally resonant phononic crystal with microcavity structure is proposed. The acoustic wave band gap characteristics of this new structure are studied using finite element method. At the same time, the corresponding displacement eigenmodes of the band edges of the lowest band g...

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Bibliographic Details
Published in:Shock and vibration 2015-01, Vol.2015 (2015), p.1-8
Main Authors: Xiang, Jiawei, Zhong, Yongteng, Li, Pei, Liu, Mao
Format: Article
Language:English
Subjects:
Acoustic properties
Band gap
Band spectra
Band theory (Physics)
Banded structure
Bridges
Crystal structure
Crystals
Electrical engineering
Energy gaps (solid state)
Mathematical analysis
Measurement
Microcavities
Propagation
Sound-waves
Studies
Two dimensional
Vibration
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Summary:A new two-dimensional locally resonant phononic crystal with microcavity structure is proposed. The acoustic wave band gap characteristics of this new structure are studied using finite element method. At the same time, the corresponding displacement eigenmodes of the band edges of the lowest band gap and the transmission spectrum are calculated. The results proved that phononic crystals with microcavity structure exhibited complete band gaps in low-frequency range. The eigenfrequency of the lower edge of the first gap is lower than no microcavity structure. However, for no microcavity structure type of quadrilateral phononic crystal plate, the second band gap disappeared and the frequency range of the first band gap is relatively narrow. The main reason for appearing low-frequency band gaps is that the proposed phononic crystal introduced the local resonant microcavity structure. This study provides a good support for engineering application such as low-frequency vibration attenuation and noise control.
ISSN:1070-9622
1875-9203
DOI:10.1155/2015/239832