| 赵晗,贾晗,孙雪聪,杨军.基于薄膜编码超表面的宽频超薄声散射体*[J].,2023,42(2):276-281 |
| 基于薄膜编码超表面的宽频超薄声散射体* |
| Broadband ultrathin sound diffuser based on the membrane-type coding metasurface |
| 投稿时间：2021-12-28 修订日期：2023-03-06 |
| 中文摘要: |
| 该文提出了一种基于薄膜编码超表面的宽频超薄声散射体。利用附加质量块的薄膜和空气腔组成的薄膜结构构建了反射声波相位差接近180°的两种共振单元。将两种共振单元按照一定的顺序进行排列，可以组成深亚波长尺寸下的声学超表面。所构建的声学超表面可以产生宽频有效的散射声场。通过有限元仿真软件对多个频率的近场散射声场分布，远场声指向性和扩散系数进行了仿真计算，仿真结果显示，该散射体可以高效的散射入射声波，并且散射效果在一定的频率范围内是宽频有效的。 |
| 英文摘要: |
| A broadband ultrathin sound diffuser based on the membrane-type coding metasurface is proposed in this paper. The resonance units are constructed with mass-decorated membrane and air cavity. Two kinds of resonance units are designed with a reflection phase difference of 180°. The acoustic metasurface consisted of these two units can produce broadband diffuse sound field. The near-field sound pressure distribution, the far-field sound pressure levels directivity patterns and the diffusion coefficient are calculated by the simulation software and compared with those of the flat plate. The simulation results show that the sound diffuser can effectively diffuse the incident waves and operate in a broadband frequency range. |
| DOI：10.11684/j.issn.1000-310X.2023.02.010 |
| 中文关键词: 超表面 薄膜共振单元 声散射体 |
| 英文关键词: metasurface membrane resonator sound diffuser |
| 基金项目:广东省重点领域研发计划项目(2020B010190002)，国家自然科学基金项目(11874383,12104480)，中国科学院声学研究所前沿探索项目(QYTS202110) |
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