Parametric Study by using Prediction Model of Railway Noise in Consideration of Reflection on Under Surface of Overpass

Abstract

In order to predict the wayside noise at the places around the overpasses on the Shinkansen line, a prediction model including the effect due to the sound reflection on the under surface of the overpasses was proposed. In this paper, acoustic characteristics of the wayside noise at the places around the overpasses were investigated by the prediction model. The prediction calculations were performed by changing the conditions of the geometrics of the overpass and the Shinkansen line. It was found out through the calculations that the reflection of the noises generated from the lower part of cars by the under surface of the overpass had great influence on wayside noise at the places close to the intersection of the overpass and Shinkansen line.