【摘要】 利用边界元法建立高速铁路区间直立型声屏障降噪预测模型,对添加硅酸盐基多孔吸声材料前后声屏障对降噪效果的影响进行数值计算。结果表明:厚度为0.08 m的硅酸盐基多孔吸声材料使得声屏障在距离线路中心30 m的铁路界限处噪声衰减量最大可增加12.5 d B;应用于声屏障的最佳硅酸盐基多孔吸声材料厚度为0.08~0.11 m。更多还原

【Abstract】 The boundary element method is used to build a noise reduction prediction model for a vertical sound barrier in high speed railway section. The numerical computation on noise reduction is done based on the models with or without porous sound-absorbing material. The result shows that,the noise reduction will increase to about 12. 5 d B in the railway clearances of 30 m width behind the noise barrier with silicate porous sound absorption material of 0. 08 m thickness; the optimal thickness for noise barrier is 0. 08 ~ 0. 11 m.更多还原