Study on Prediction Model of Noise from a Tunnel Portal of Railway

Abstract

A prediction model, which estimates the Shinkansen wayside noise around tunnel portals, has been proposed. In the model, the wayside noise consists of the noises from trains in both open section and tunnel section. In addition, the noise from tunnel section is composed of two sound contributions: noise directly emitted from a vehicle in a tunnel, and multiple-reflection noise in the tunnel. In this paper, the model is improved about the multiple-reflection noises by introducing both the screen effect due to vehicles in the open section and the directional characteristics of the sound source of the multiple-reflection noises. Then, the validity of the model is shown by comparing the results in the field test with the results using the model.