铁路客运专线吸声式声屏障降噪研究

声屏障是隔断客运专线环境噪声传播途径的降噪方式之一，工程上常用的计算声屏障插入损失的方法是基于演算性质的方法，很难实现声屏障的精确设计。为了预测铁路客运专线声屏障的降噪效果，利用边界元法建立铁路客运专线声屏障降噪预测模型，对声屏障插入损失进行数值计算。研究结果表明：（1）声屏障对高频噪声辐射的降噪效果比低频噪声的要好；（2）客运专线声屏障由于吸附材料的不同，它们的降噪效果表现得都不同。

Noise Reduction for Sound Barrier in Railway Passenger Dedicated Lines

Sound barrier way passenger dedicated lines. i simplified method, and is unlik s one type of noise reduction through cutting noise propagation in the railEngineering method of computing insert loss of the sound barriers is a ely to be used for accurate design of sound barrier. To predict the noise reduction effect of the sound barriers on the railway passenger dedicated lines, a model of the boundary element method （BEM） is established for the analysis of the insert loss of sound barriers of the lines. The result shows that the noise reduction effect of the sound barrier for high frequency noise is better than that for low frequency noise, and the noise reduction effects for different absorption materials of the sound barrier are also different.