基于仿真的铁路车轮不圆度安全限值研究

摘要

In order to study the safety threshold of periodic non-roundness of railway wheels , by means of train track vertical and horizontal coupling dynamics and ADAMS/Rail software , a coupling dynamics model of railway vehicle with out-of-round wheels and track is built .The effect of periodic non-roundness of wheel on the dynamical behavior of the vehicle system is analyzed .The numerical results regarding the misalignments of the vehicle and wheelset , the vertical wheel/rail contact forces and the reduction in the wheelset loading are presen-ted under the conditions in which the wheels are in out-of-round and the train speed is from 200 km/h to 350 km/h.The results show that the dynamical vertical wheel/rail interaction forces are much related to the wheel out-of-roundness status .The critical range of the wheel out-of-roundness is determined according to the tradition-al criterion of wheelset loading reduction for safely running estimation .It’ s pointed out that out-of-round railway wheels can be detected by wheel/rail interaction force real-time monitoring system to guarantee safety and to min-imize costs for repair and maintenance .%为了研究高速列车车轮踏面不圆度的安全限值，基于车辆轨道垂横向耦合动力学理论，采用车辆动力学仿真分析软件ADAMS/Rail，建立了考虑车轮非圆化状态下的整车车辆/轨道空间耦合动力学模型。分析计算高速运行状态下常见车轮踏面不圆顺问题所导致的车辆轨道系统轮轨冲击振动特征，及其随列车运行速度的变化规律，给出了车速200～350 km/h 时轮轨作用力响应峰值与车轮不圆度之间的关系，确定了高速行车条件下车轮不圆度的临界范围。该研究可为基于轮轨作用力监测的车轮不圆顺状态识别提供理论指导。