120 Experimental study on mechanism of noise at higher frequencies above 10 kHz generated from conventional railway cars running on a curved section

Abstract

Many studies to develop understanding of rolling noise, which has great influence on wayside noise in the frequency range 250 to 4000 Hz, have been carried out by measurements and theoretical models widely. In some studies, when a train runs on a gentle curved track, wheel/rail noise is greater than usual rolling noise by more than 5 dB, and this is closely related to the occurrence of the noise at higher frequencies above 10 kHz. In this paper, an attempt is made to investigate the mechanism of the noise through running measurements. It is found that the wheels on the outside rail of the curve are the most important source during a train pass-by and the predominant component is the outside rail after a train has passed.