Influence of Multiple Reflections between Railway Car Bodies and Barriers on Noise Propagation

Abstract

In order to assess the influence of multiple reflections between barriers and railway car bodies on noise propagation, a numerical study using a 2D-FDTD method is performed with changing the barrier height, the lane-to-barrier distance, and the bending angle at the upper part of the barrier. Subsequently, a 1/25 scale model experiment is carried out, which confirms a corresponding tendency between numerical and measured results. Furthermore, considering the discrepancy between the numerically calculated attenuation values and the diffraction attenuation values without multiple reflections by Maekawa’s chart, a chart of correction values is presented to incorporate the effects of multiple reflections.