高寒动车组车轮磨耗演变特性及其影响分析

对某线路上运行的高寒动车组车轮磨耗进行长期跟踪测试，得到车轮磨耗演变规律。将实测车轮踏面分别与CHN60轨和60 N轨匹配，分析车轮磨耗对轮轨接触几何关系和接触力学特性的影响。利用多体动力学软件SIMPACK建立车辆动力学仿真模型，研究车轮磨耗过程中车辆动力学性能的演变规律。研究结果表明：车轮踏面磨耗随运行里程呈线性增加趋势，动车和拖车平均磨耗速率分别为0.0434 mm/万千米和0.0398 mm/万千米，且几乎没有轮缘磨耗。等效锥度随运行里程呈前期增长较快后期平缓的非线性特性，且与CHN60匹配时等效锥度明显高于与60 N轨匹配。实测轮轨匹配下的力学特性及动力学性能均略有下降，车辆与60 N轨匹配时体现出更好的服役性能。

WHEEL WEAR EVOLUTION CHARACTERISTICS OF ALPINE HIGH-SPEED EMU AND ANALYSIS OF ITS INFLUENCE

A long-term wheel wear tracking test of an alpine high-speed EMU was carried out on a certain line.The evolution rule of wheel wear was obtained.The measured wheel profiles matched with CHN60 rail and 60N rail profiles,respectively.The influence of wheel wear on wheel-rail contact geometrical relationship and contact mechanical characteristics was analyzed.A vehicle dynamic model was established by the multibody dynamic analysis software SIMPACK to study the evolution of vehicle dynamic performance with the evolution of wheel wear.The results indicates that the wheel tread wear increases linearly with the operation mileage,while there is little flange wear.The average tread wear rates of the motor and trailer cars are 0.0434 mm per 10000 km and 0.0398 mm per 10000 km,respectively.The equivalent conicity increases with operation mileage in a nonlinear way,which increases rapidly in the early stage and gently in the later period.When the measurement wheel profiles matched with CHN60 rail profile,the equivalent conicity is significantly higher than that for wheel profiles matching with 60N rail profile.The mechanical properties and dynamic performance decrease slightly under the measured wheel-rail profiles,and the vehicle has a better service when running on 60N rail.