【摘要】 针对北京地铁钢轨异常波磨问题,对地铁5号线各种轨道结构形式进行钢轨振动加速度测试,对地铁4、5号线全线进行车厢内噪声测试,在地铁5号线选择4种扣件形式进行钢轨模态测试。结果表明:对于剪切型减振器扣件,在300 Hz左右轮轨的共振效应,是该扣件区段产生钢轨波磨的主要原因;钢轨波磨引起的轮轨接触面不平顺,是产生车内异常噪声的主要原因。剪切型减振器扣件在200~350 Hz频段过低的轨道阻尼,无法限制住钢轨的振动,使得波磨极易形成和发展。更多还原

【Abstract】 In order to study the rail corrugations on Beijing metro lines,authors carried out in-situ measurements of rail accelerations for all types of track on line 5,noises in trains on line 4 and line 5 and rail vibration modes for four types of fasteners on line 5.Results indicated that the resonance between rail and wheel at about 300Hz was the main reason for the rail corrugations which occurred on the section with shearing vibration-reduction fasteners;the wheel/rail contact surface unevenness induced by corrugation caused mainly the abnormal noises in the train;the low damping of the shearing vibration-reduction fasteners in the frequency range of 200～350Hz cannot restrain the vibration of rails,which may also induce rail corrugation.更多还原