道岔区内病害形式多种多样。利用车辆 -道岔系统空间耦合振动模型 [1 ] ,以尖轨与基本轨不密贴、固定式辙叉不同磨耗以及间隔铁失效为例 ,本文模拟计算了它们对轮轨系统相互作用的影响情况。结果表明 ,尖轨与基本轨不密贴将使得尖轨横向和垂向振动加剧 ,而固定式辙叉达到严重磨耗以后 ,系统将产生激烈的轮轨冲击振动 Turnout area a variety of forms of disease. Taking the coupling vibration model of vehicle-switch system as an example [1], taking the non-close contact between the sharp rail and the basic rail, the different wear of the fixed frog and the intermittent iron failure, this paper simulates their influence on the wheel-rail system interaction . The results show that the lack of close contact between the sharp rail and the basic rail will aggravate the transverse and vertical sharp vibration of the rail. When the fixed frog reaches serious wear, the system will produce intense wheel-rail impact vibration