| 李晨曦,胡莹,何立燕.穿纤维微穿孔板吸声系数的有限元仿真[J].,2019,38(6):954-960 |
| 穿纤维微穿孔板吸声系数的有限元仿真 |
| Simulation for the sound absorption of micro perforated panels with metal fibers using Finite Element Method |
| 投稿时间：2019-01-30 修订日期：2019-11-05 |
| 中文摘要: |
| 为拓宽微穿孔板的吸声频带，该文用有限元算法建立了典型微穿孔板和穿入不同数量金属纤维的微穿孔板模型，研究了两种微穿孔板的吸声系数、声阻抗和微孔内法向质点速度的空间分布，并进行了试验验证。有限元仿真和试验数据表明：穿入金属纤维可以拓宽微穿孔板的吸声频带，吸声系数也随纤维根数的增加而下降；吸声系数仿真结果与试验结果趋势一致，仿真模型可以有效模拟穿入纤维前后微穿孔板的吸声特性；穿入金属纤维导致黏滞效应引起的低质点速度区域增大，声阻增加，引起吸声系数的降低，而声抗变化不大。研究发现，有限元仿真方法适用于结构相对复杂的微穿孔结构的声学建模，能直观地体现微孔复杂结构的影响，值得继续深入研究和工程应用。 |
| 英文摘要: |
| To broaden the sound absorption bandwidth of micro perforated panels (MPPs), the finite element models for the acoustic properties of an MPP without and with inserted metal fibers are conducted in this paper. Based on the FEA models the sound absorption coefficients, the acoustic impedances, and the distributions of the particle velocity in a perforation were investigated. These models are validated by the measured sound absorption coefficients of an MPP without and with metal fibers. The simulated and measured sound absorption coefficients agree with each other. It is also found that the metal fiber insertion is able to broaden the sound absorption bandwidth due to the increased acoustic resistance resulted from the increased viscosity. This paper indicates that the FEA modeling can be used to simulate the acoustic properties of MPPs with complex structures. It can illustrate the effect of the complex structures on the acoustic properties of MPPs vividly and is worth of further research. |
| DOI：10.11684/j.issn.1000-310X.2019.06.007 |
| 中文关键词: 微穿孔板 吸声系数 有限元法 |
| 英文关键词: micro perforated panel sound absorption finite element method |
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