BS EN 16272-3-1-2012 铁路应用设施.轨道.对空气传声起作用的隔音板和相关设备.声学性能测定用试验方法.本质特征.扩散声场应用的标准铁路噪声谱和单个数字评定
Railway applications. Track. Noise barriers and related devices acting on airborne sound propagation. Test method for determining the acoustic performance. Normalized railway noise spectrum and single number ratings for diffuse field applications