摘要
实验中发现了在微穿板后插入小于空腔深度的侧隔板铝板,使其背后空腔不完全隔离,会影响微穿孔结构在扩散场中的吸声性能。合理配置侧隔板的插入长度周期以及侧隔板插入的深度,可以使该微穿孔结构的吸声性能得到有效的提升。文中对这种非完全隔离型微穿孔空腔结构在扩散场中的吸声原理进行了研究,探明了其吸声性能与侧隔板插入长度周期以及侧隔板插入深度的关系,建立了对这种吸声结构的吸声性能理论计算模型,并与实验结果进行对比。
In the experiments we found that when inserting short aluminum separators behind the MPP to partition the cavities incompletely, it will affect the sound absorption performance in diffuse field. If the insertion period length and the insertion depth of the separators are well arranged, a great improvement of sound absorption properties will be achieved. In this paper, the acoustic performance of MPPs with incompletely partitioned cavities is analyzed, and the relationship between sound absorption properties and the insertion period length and depth is found. A theoretical model of such structures is proposed, which agrees well with the experimental results.
引文
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