Abstract
Several studies have been conducted by measurements and theoretical models on developing an understanding of the wheel/rail noise, which significantly influences wayside noise in the frequency range from 250 Hz to 4 kHz. Few studies reported that when a train runs on a gentle curve, the wheel/rail noise is greater by more than 5dB than the usual rolling noise, and this is closely related to the occurrence of the noise at higher frequencies above 10 kHz. This paper comments with an attempt to investigate the vibration properties of a rail at high frequencies. These properties are experimentally examined using a shaker. It is confirmed that free wave propagation occurs in the rail at higher frequencies above 10 kHz owing to a low decay rate.
