抄録
Railway noise is composed of various sources, such as wheel/rail noise, aerodynamic noise, traction-motor fan noise and bridge noise. The bridge noise is generated by vibration of steel or concrete bridges, which is mainly induced by dynamic forces due to the wheel-rail interaction. For the concrete bridges, the bridge noise is predominant below 500 Hz, and could have greater contribution to the total noise than the other sources at a measuring point close to them. Therefore, the bridge noise is increasingly being viewed as a problem that needs addressing. In order to put countermeasures in place to mitigate the bridge noise suitably, it is important to make a better understanding in terms of vibratory and acoustic properties of the bridges. In this paper, an attempt to examine the vibratory behaviours of three types of concrete bridge has been made through a numerical calculation by using FEM.
