中文摘要：

运用能量法建立车辆—轨道耦合动力学模型,结合大秦线轨道结构力学参数,分别计算分析了45,50,60和75 kg/m共4种钢轨支承下轮轨系统各结构的动力响应,研究钢轨重型化对轮轨系统动力特性的影响。研究发现：钢轨重型化对车辆系统的动力响应影响较小,而对轨道结构和路基的影响显著;随着钢轨质量及抗弯刚度的增大,车体位移、车轮加速度、轮轨力、钢轨位移、扣件力、轨枕振动位移及枕下支承力降低,车体加速度、钢轨加速度先增大后减小,轨枕加速度增加。

英文摘要：

The vehicle-track coupling dynamics model was established by the energy method,the structure dynamic response of wheel-rail system was calculated under rail support of 45,50,60 and 75 kg/m respectively by combining with track structure mechanical parameters of Daqin line,and influence of heavy-duty rail on wheel-rail system dynamic characteristics was studied.The results showed that the heavy-duty rail has little effect on the dynamic response of the vehicle system while has a significant effect on track structure and subgrade,vehicle body displacement,wheel acceleration,wheel-rail force,rail displacement,fastening force,sleeper vibration displacement and sleeper supporting force decreases,vehicle body acceleration and rail acceleration increases at the beginning and then decreases,and the sleeper acceleration increases monotonously with the increase of rail quality and bending stiffness.