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利用层多重散射法分析了一种含圆柱形谐振散射体黏弹材料吸声层在钢背衬条件下的低频吸声特性.该吸声层由包覆软材料的圆柱空腔周期嵌入橡胶材料中构成,其中,散射体轴线与吸声层平行.结果表明,20mm厚吸声层在1000—3000Hz具有良好的吸声性能.通过综合分析单个散射体的吸收截面、单层周期散射体的声吸收、结构内部位移场以及耗散功率密度分布,揭示了该吸声层的低频吸声机理.
The low-frequency sound absorption characteristics of a sound-absorbing layer of a viscoelastic material with a cylindrical resonant scatterer under steel backing were analyzed by the layer-multiple scattering method. The sound absorbing layer was embedded in the rubber material In which the axis of the scatterer is parallel to the sound absorbing layer.The results show that the 20mm thick sound absorbing layer has good sound absorption performance at 1000-3000Hz.By comprehensive analysis of the absorption cross section of single scatterer, Absorption, internal displacement field and dissipative power density distribution, the absorption mechanism of the sound absorption layer is revealed.