| 王兴国,舒海生,张 靓,刘秀林,王凤娟.径向声子晶体隔声特性*[J].,2019,38(1):120-128 |
| 径向声子晶体隔声特性* |
| Acoustic insulation properties of radial phononic crystals |
| 投稿时间：2018-04-16 修订日期：2018-12-26 |
| 中文摘要: |
| 摘要该文构造了由两种匀质材料交替分布的径向声子晶体柱壳模型。首先，针对声波在其中的轴对称传播情况进行了理论分析，建立了声波由内向外传播的传递矩阵，进而导出了声压透射系数和隔声量表达式。采用数值分析的方法系统地讨论了径向声子晶体柱壳的隔声特性，并与单一材质柱壳的传播规律进行对比分析，其次，借助有限元仿真分析的手段对数值结果进行了验证。最后，详细分析了内外流体的特性阻抗对径向声子晶体柱壳隔声特性的影响，得到了相应的参数影响规律。研究表明，径向声子晶体柱壳存在声波带隙，导致其在带隙范围内的隔声效果远远优于单材质柱壳，并且该结构的固有特性突破了质量定律的限制；声波带隙内表面局域态现象出现与否由内外声场和结构场共同决定。 |
| 英文摘要: |
| A cylindrical shell radical phononic crystal model arranged alternately between two homogenous materials is constructed in this paper. First, the theoretical analysis was based on the axial symmetry propagation in the model. The sound pressure transmission coefficient and the sound insulation expression were derived based on the establishment of acoustic wave propagating transfer matrix from the inside out. The sound insulation properties of cylindrical shell of radial phononic crystals were systematically discussed by means of numerical analysis method, and compared with the propagation law of a single material cylindrical shell. Then, the numerical results were verified by means of finite element simulation analysis. Finally, the effect of characteristic impedance of internal and external on the acoustic characteristic of radical phononic crystal was analyzed. So the corresponding parameter influence law was obtained. The results show that the band gap exists in the cylindrical shell of radial phononic crystals, which results in a better sound insulation effect than the single material cylindrical shell in the band gap range, and the inherent characteristics of the structure break through the limitations of the mass law. The surface localized modes phenomenon of the acoustic band gap is determined by the internal and external sound field and structure field. |
| DOI：10.11684/j.issn.1000-310X.2019.01.016 |
| 中文关键词: 径向声子晶体，柱壳，传递矩阵，声波带隙 |
| 英文关键词: Radial phononic crystal Cylindrical shell Transfer matrix Band gap |
| 基金项目:国家自然科学基金项目 (51375105) |
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