Journal
PHYSICS LETTERS A
Volume 380, Issue 25-26, Pages 2167-2172Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2016.03.027
Keywords
Phononic crystals; Phononic band gaps; Analogous rigid mode; Localized resonance mechanism; Double-sided stubbed composite PC plate; Expansion of lower-frequency locally resonant band gaps
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Funding
- National Science Foundation of China [51275377]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1172]
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We studied the expansion of locally resonant complete band gaps in two-dimensional phononic crystals (PCs) using a double-sided stubbed composite PC plate with composite stubs. Results show that the introduction of the proposed structure gives rise to a significant expansion of the relative bandwidth by a factor of 1.5 and decreases the opening location of the first complete band gap by a factor of 3 compared to the classic double-sided stubbed PC plate with composite stubs. Furthermore, more band gaps appear in the lower-frequency range (0.006). These phenomena can be attributed to the strong coupling between the analogous rigid mode of the stub and the anti-symmetric Lamb modes of the plate. The analogous rigid mode of the stub is produced by strengthening the localized resonance effect of the composite plates through the double-sided stubs, and is further strengthened through the introduction of composite stubs. The analogous rigid mode of the stubs expands the out-of-plane band gap, which overlaps with in-plane band gap in the lower-frequency range. As a result, the complete band gap is expanded and more complete band gaps appear. (C) 2016 Elsevier B.V. All rights reserved.
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