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用流阻法和显微分析法定量表征材料的孔隙状况,研究以陶粒为主要骨料的多孔吸声材料在不同有效孔隙率和中值孔径下的吸声性能。结果表明陶粒吸声材料的NRC随着流阻的增加先增后减,当流阻为1 144.07 Pa.s/m3,材料吸声性能达到最佳;材料的中值孔径在0.71～1.44 mm这一范围,当其减少时,吸声性能降低;随着有效孔隙率的增加,NRC呈线性上升的趋势,其中高频吸声性能对材料内部孔隙状况的变化更敏感。
Flow resistance and microscopic analysis were used to quantitatively characterize the pore states of the materials. The sound absorption performance of the porous sound-absorbing materials with ceramsite as the main aggregate at different effective porosity and median pore diameters was studied. The results show that the NRC of ceramsite sound-absorbing material first increases and then decreases with the increase of flow resistance, and when the flow resistance is 1 144.07 Pa.s / m3, the sound-absorbing performance of the material is optimized; the median pore diameter of the material is 0.71-1.44 mm In this range, as it decreases, the sound absorption performance decreases. With the increase of effective porosity, the NRC tends to increase linearly, and the high-frequency sound absorption performance is more sensitive to the change of pore conditions in the material.