EN 16272-4:2016
铁路应用设施-轨道-隔声板和相关对空气声音传播有作用的设备-声学性能测定试验方法-第4部分:本质特征-在直接声场下的声衍射的原位值
Railway applications - Track - Noise barriers and related devices acting on airborne sound propagation - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - In situ values of sound diffraction under direct sound fiel