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Shock and Vibration
Volume 2015, Article ID 239832, 8 pages
http://dx.doi.org/10.1155/2015/239832
Research Article

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

1College of Mechanical & Electrical Engineering, Wenzhou University, Wenzhou 325035, China
2School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, China

Received 22 October 2014; Accepted 30 November 2014

Academic Editor: Yumin He

Copyright © 2015 Mao Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.