| 三元周期结构声禁带形成机理 |
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| 引用本文： | 华佳,张舒,程建春. 三元周期结构声禁带形成机理[J]. 物理学报, 2005, 54(3): 1261-1266 |
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| 作者姓名： | 华佳 张舒 程建春 |
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| 作者单位： | 南京大学近代声学国家重点实验室，南京 210093 |
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| 基金项目： | 国家杰出青年基金（批准号：10125417）和国家重点基础研究发展规划项目（批准号：51307）资助的课题. |
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| 摘 要： | 研究了二维三元周期结构的声禁带加宽现象产生的物理机理. 用有限元方法分别计算了嵌入1，3和5排铁柱和具有橡胶包层铁柱的周期复合结构的声能量传输谱和禁带形成过程. 通过比较二元和三元周期复合结构中的声场分布情况，认为三元样品宽声禁带的形成机理是Bragg反射和局域化共振共同作用的结果，前者在高频段的作用更为明显，而后者在低频段起主要作用.关键词：三元周期结构声禁带局域共振Bragg反射
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| 关 键 词： | 三元周期结构 声禁带 局域共振 Bragg反射 |
| 文章编号： | 1000-3290/2005/54(03)/1261-06 |
| 收稿时间： | 2004-06-08 |
Mechanism of broad acoustic band-gap in the three-component composite |
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| Hua Jia,Zhang Shu,CHENG Jian-chun. Mechanism of broad acoustic band-gap in the three-component composite[J]. Acta Physica Sinica, 2005, 54(3): 1261-1266 |
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| Authors: | Hua Jia Zhang Shu CHENG Jian-chun |
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| Abstract: | Mechanism of broad acoustic band_gap in the two_dimensional three_component composite is investigated by calculating acoustic transmission spectra and acoustic fields for different inserted steel rows embedded in epoxy resin matrix with or without rubbers as the coating material. By comparing the acoustic fields inside the two_ and three_component crystal slabs, one can conclude that the broad acoustic band_gap in the three_component crystal slab is formed by the coexistence of the Bragg reflection of a periodic structure and the localized resonance in the soft rubber. The former is evidence in higher frequency and the latter is dominant in lower frequency with the wavelength longer than that of the coating layer. |
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| Keywords: | three-component composite acoustic bandgap localized resonance Bragg reflection |
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