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详细分析了不同厚度和放置方式的吸声材料对空腔声阻抗和穿孔辐射声阻抗的影响,从而建立起微穿孔-吸声复合结构的理论分析模型,以用于预测和优化结构的吸声性能。并针对常用的几种微穿孔-吸声复合结构,通过理论分析和阻抗管实验探讨了其声学性能的不同。分析结果表明,理论计算和实验结果吻合很好,证明了模型的可用性。考虑到结构的声学性能和经济性,建议采用中部放置吸声材料的复合结构。
The effects of different thickness and placement of sound-absorbing materials on cavity acoustic impedance and acoustic impedance of perforated radiation are analyzed in detail, so that a theoretical analysis model of micro-perforation-sound absorption composite structure is established for predicting and optimizing the structural sound absorption performance. Aiming at the commonly used micro-perforation-sound-absorbing composite structures, the differences of acoustic properties are discussed through theoretical analysis and impedance tube experiments. The analysis results show that the theoretical calculation and experimental results are in good agreement, which proves the availability of the model. Taking into account the structure of the acoustic performance and economy, it is recommended to use the central composite structure of sound-absorbing materials.