Estimation of bridge noise in high-speed train based on rail vibration in low-speed section

(Regarding estimated rail vibration at high-speed section)

Abstract

When trains run at higher speed, local wear on a wheel tread could make bridge noise and wayside noise greater. As the first step, to predict both the noises at higher-speed sections, an attempt is taken to estimate the rail vibration at a highspeed section by using that obtained at a low-speed section in this study. In the estimation, the vibration properties of a wheel, track and contact spring at each section are used, and it is assumed that a wheel roughness is greater than a rail roughness at the spatial frequencies where the effect due to the local wear appears. The rail vibration is also measured at the high-speed section. It is found that, at the high-speed section, the estimation shows good agreement with the measurement in the frequency range where the local wear has a stronger effect.