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Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2010, Vol. 11 Issue (10): 827-834    DOI: 10.1631/jzus.A1000123
    
Propagation of flexural waves in phononic crystal thin plates with linear defects
Zong-jian Yao, Gui-lan Yu, Yue-sheng Wang, Zhi-fei Shi, Jian-bao Li
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
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Abstract  The band structures of flexural waves in a phononic crystal thin plate with straight, bending or branching linear defects are theoretically investigated using the supercell technique based on the improved plane wave expansion method. We show the existence of an absolute band gap of the perfect phononic crystal and linear defect modes inside the gap caused by localization of flexural waves at or near the defects. The displacement distributions show that flexural waves can transmit well along the straight linear defect created by removing one row of cylinders from the perfect phononic crystals for almost all the frequencies falling in the band gap, which indicates that this structure can act as a high efficiency waveguide. However, for bending or branching linear defects, there exist both guided and localized modes, and therefore the phononic crystals could be served as waveguides or filters.

Key wordsPhononic crystal      Thin plates      Linear defects      Flexural waves     
Received: 28 March 2010      Published: 05 October 2010
CLC:  O322  
Cite this article:

Zong-jian Yao, Gui-lan Yu, Yue-sheng Wang, Zhi-fei Shi, Jian-bao Li. Propagation of flexural waves in phononic crystal thin plates with linear defects. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2010, 11(10): 827-834.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1000123     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2010/V11/I10/827

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