<b>Study on the Occurrence Conditions of Squeal Noise and High-frequency Noise in Railway Curved Sections</b>

Squealing (below 10 kHz) and high-frequency noise (above 10 kHz) can occur when trains pass through curved sections of track. Measurements of these noises were carried out on commercial lines to understand how they are generated. It was found that these noises vary from wheel to wheel, having large dispersion. The analysis results showed that these noises are prominent when the outer wheel flanges are in contact with the outer rail at certain passing speeds. On the other hand, these noises are reduced when a train is running at equilibrium speed in curves.