| 微穿孔板复合板型声学超材料的低频吸声 |
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| 引用本文： | 邢拓,李贤徽,盖晓玲,蔡泽农,王芳,关淅文.微穿孔板复合板型声学超材料的低频吸声[J].声学学报,2020,45(6):878-884. |
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| 作者姓名： | 邢拓 李贤徽 盖晓玲 蔡泽农 王芳 关淅文 |
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| 作者单位： | 环境噪声与振动北京市重点实验室北京市劳动保护科学研究所 北京 100054;环境噪声与振动北京市重点实验室北京市劳动保护科学研究所 北京 100054;环境噪声与振动北京市重点实验室北京市劳动保护科学研究所 北京 100054;环境噪声与振动北京市重点实验室北京市劳动保护科学研究所 北京 100054;环境噪声与振动北京市重点实验室北京市劳动保护科学研究所 北京 100054;环境噪声与振动北京市重点实验室北京市劳动保护科学研究所 北京 100054 |
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| 基金项目： | 国家自然科学基金项目(11604015)、北京市自然科学基金项目(1172007,1182011)、北科学者计划项目(BS201901)、北科青年学者计划项目(YS202003)和北京市劳动保护科学研究所2019年度改革与发展自立课题资助 |
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| 摘 要： | 针对单层微穿孔板的低频吸声问题提出了微穿孔板复合板型声学超材料结构。将板型声学超材料置入微穿孔板结构的背腔内部实现结构复合。实验结果表明:在相同背腔厚度下,复合结构的吸声性能整体优于单层微穿孔板结构,其中复合结构的吸声曲线从396~892 Hz均大于0.6,在453 Hz处吸声系数达到0.972。利用有限元方法对复合结构进行了仿真,仿真计算的吸声曲线与实验吸声曲线的趋势基本相同,同时发现低频吸声主要由板型声学超材料与声波相互作用贡献。板型声学超材料的吸声峰值的对应频率处,其等效动态质量密度从正变负。在复合结构内部的微穿孔板和板型声学超材料存在相互耦合作用,使得复合结构的第一峰值发生微小偏移。增加板型声学超材料的质量块重量可以使第一吸声峰值向低频移动;保持总背腔厚度不变,增加板型声学超材料的子腔厚度,也可以使第一吸声峰向低频移动。
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| 收稿时间： | 2019-04-30 |
Low-frequency sound absorption of microperforated panel composite plate-type acoustic metamaterial |
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| Affiliation: | Bejing Key Latorutory of Ertironment Noise and Vibrution, Beijing Municipal Institute of Labor Protcction Bejing 100054 |
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| Abstract: | Microperforated panel composite plate-type acoustic metamaterial structure is proposed for the low-frequency sound absorption problem of a single-layer microperforated panel.The plate-type acoustic metamaterial is placed inside the cavity behind the microperforted panel.The experimental results show that the sound absorption performance of the composite structure is better than single-layer microperforated panel under the same cavity thickness.The sound absorption curve of the composite structure is greater than 0.6 from 396 Hz to 892 Hz,and the sound absorption coefficient is 0.972 at 453 Hz.The composite structure is simulated by the finite element method.The sound absorption curve of the simulation is basically consistent with the trend of the experimental sound absorption curve.The low-frequency sound absorption is mainly contributed by interaction of the plate-type acoustic metamaterial and sound waves.At the corresponding frequency of the sound absorption peak value of the plate-type acoustic metamaterial,the effective dynamic mass density of plate-type acoustic metamaterial begins to become negative.Microperforated panel and platetype acoustic metamaterial have mutual coupling effects inside the composite structure.The coupling causes a slight offset in the first peak of the composite structure.Increasing the mass weight of the plate-type acoustic metamaterial can cause the first sound absorption peak to move to the low-frequency.And increasing the thickness of the sub-cavity of the plate-type acoustic metamaterial,and keeping the thickness of the total cavity,the first sound absorption peak can also be moved to the low frequency. |
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