RAILWAY NOISE-PROPAGATION MODELS

In this paper is presented a model to calculate the sound event level and thereby the energy equivalent level for short-distance railway noise propagation in a town. A model of the ground effects on the propagation from line sources, regarded as an incoherent superposition of point sources, is presented and discussed for spherical and directional sources. The influences of ground effects are calculated for short distances (15 m) and for an intermediate distance (≈50 m) and are compared with frequency dependent measurements. For intermediate and long-distance railway noise propagation the sound event and the maximum sound levels are derived and calculated for spherical and directional sources. The calculations of the radiation characteristics are compared with short distance measurements of different kinds of trains, and the frequency dependent results are displayed. © 1990.