철도차량 스킬소음 저감 기초연구

초록

Railway squeal noise takes place when a train negotiates the sharp curved track. At negotiating curved track large lateral creep forces occur and negative friction coefficient is shown. The wheel vibration at high frequency and negative friction are main causes of the squeal noise at the sharp curved track. Thus, reducing wheel vibration at target frequency as well as removing negative friction are main keys. In this fundamental study, two-material rail discs and passive shunt circuit are considered in order to remove negative friction and to reduce wheel vibration, respectively. Some of two material rail discs show passive friction or non-negative friction on the experiments using the scaled test rig. Study of reducing the wheel vibration using the shunt circuit are ongoing currently.