構内試験線の複数の曲線区間におけるきしり音の発生状況

抄録

Measurements and theoretical studies related to wheel/rail noise have been carried out widely and thoroughly. The wheel/rail noise in the frequency range of 250 Hz to 4 kHz significantly influences the wayside noise along railway lines. However, when a train runs on a sharply curved track, squeal noise due to wheel and rail interactions in the frequency range of 1 kHz to 8 kHz has greater contribution to the total wayside noise. In this paper, measured results of noise close to rolling wheel during running are shown for tracks with different curve radius. The dominant frequencies of squeal noise are 1125 Hz and 2000 Hz at the curved section, whereas the noise levels are not necessarily equal for each section. In addition, the squeal noise at these frequencies tends to increase with the train velocity but become saturated at speed over 20 km/h. Furthermore, squeal noise tends to become greater as the curve radius is smaller. These results suggest that level of squeal noise depends on not only curve radius but also the track conditions.