Abstract

This study utilises the transfer matrix method (TMM) to address the acoustic characteristics of multilayered cylindrical shells lined with porous materials. The TMM theoretical model for the sound transmission loss of composite cylindrical shells with internal porous materials is derived by establishing transfer matrices for the air/composite material interface, composite material/foam interface, foam/air interface and boundary interfaces. The accuracy of the TMM model is validated through a comparison and analysis with experimental results. Building upon this, the impact of porous foam material parameters and types on the structural sound transmission loss is discussed. The results indicate that the use of TMM accurately reflects the acoustic performance of composite structures. Additionally, this model allows for the determination of the influence patterns of porous foam material parameters and types on the acoustic performance of composite structures. In the frequency range of 100–10,000 Hz, the sound transmission loss of the melamine foam-lined composite structure increases with the increase in flow resistance and porosity and the decrease of the tortuosity factor. The use of the porous lining material significantly enhances the structural sound insulation performance.

中文翻译：

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基于TMM的多孔材料层合圆柱壳隔声特性研究

摘要

本研究利用传递矩阵法 (TMM) 来解决内衬多孔材料的多层圆柱壳的声学特性。通过建立空气/复合材料界面、复合材料/泡沫界面、泡沫/空气界面和边界界面的传递矩阵，推导了内部多孔材料复合圆柱壳传声损失的TMM理论模型。通过与实验结果的对比分析，验证了TMM模型的准确性。在此基础上，讨论了多孔泡沫材料参数和类型对结构声音传输损失的影响。结果表明，TMM的使用准确地反映了复合材料结构的声学性能。此外，该模型还可以确定多孔泡沫材料参数和类型对复合结构声学性能的影响模式。在100~10000 Hz频率范围内，三聚氰胺泡沫衬里复合结构的传声损失随着流阻和孔隙率的增加以及弯曲系数的减小而增加。多孔衬里材料的使用显着增强了结构隔音性能。