快速线路轨道刚度合理值的研究

轨道动态几何形位直接对行车安全、轮轨作用力、车辆振动产生影响.轨道动态几何形位的变化与众多因素相关.轨道刚度变化同时影响着轮轨动荷载和轨道动态几何形位的变化.将沪宁线轨检车实测动态不平顺输入动力仿真软件,分别计算不同垂向和横向刚度时的轮轨动轮载和钢轨的垂向、横向动位移,并改变车辆速度和输入不平顺的大小,分析轨道不平顺、轮轨动荷载和钢轨动位移之间的关系.利用正态分布的原则统计不同状态下动轮载和动位移的最大值,分析对比钢轨动态变形和轮轨动荷载随刚度和速度的变化趋势,提出了合理的轨道刚度取值范围,并分析了初始不平顺大小对轨道动态位移的影响.

Research of the Fast-speed Railway Track Reasonable Stiffness

Running safety,wheel-rail interaction forces and vehicle vibration are directly affected by railway track dynamic geometry,which is related with many elements.The changing of track stiffness affects wheel-rail dynamic forces and track dynamic geometry performance simultaneously.Vertical and lateral dynamic wheel-rail forces,vertical and lateral track displacement at different track stiffness are calculated using dynamic vehicle-track simulation software,taking the actual railway track geometry data from the track inspection car on Shanghai-Nanjing railway as excitation.Vehicle velocity and track geometry are changed as well.The relationship among track geometry,wheel-rail dynamic forces and track dynamic displacement are analyzed.The maximum value of dynamic wheel-rail forces and dynamic geometry are calculated using method of normal school.The development trend of track deformation and wheel rail forces caused by changing of track stiffness and track geometry are contrasted and analyzed,and more reasonable range of track stiffness values are put forward.