微穿孔共振吸声结构中吸声材料的作用

基金项目:

国家自然科学基金项目资助(10704057)

详细信息

Effect of sound-absorbing material on a microperforated absorbing construction

摘要: 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。

Abstract: According to the thickness and the configuration of sound-absorbing material,the cavity's acoustical impedance and the aperture's radiation acoustical impedance is analyzed in detail.Thus,to predict and optimize the sound absorption performance of the composite structure of sound-absorbing material and microperforated panel, a theoretical model is established.And the acoustical properties of several commonly used composite structures are comparatively analyzed both in theory and experiment.Good agreement between the theoretical calculations and experimental results shows the availability of the model.Taking into account the performance and economy,the composite structure of sound-absorbing material in the middle of cavity is suggested.