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将轮轨接触边界条件用罚函数法释放,采用点面接触单元导出轮轨接触有限元控制方程,进一步建立轨道结构落轴冲击动力有限元方程.计算分析了落轴冲击对高架线路轨道结构产生的动态响应,详细比较了弹性支承块及短轨枕埋入式整体道床轨道结构的动力性能,并由现场实测进行验证.结果表明,弹性支承块轨道结构通过轨下和块下刚度的合理匹配,动力性能优于普通短轨枕结构,应用于线路减振地段较为理想;同时,利用落轴冲击有限元模型及其试验分析轨道结构动力性能,直观有效.
The wheel-rail contact boundary condition is released by the penalty function method, and the point-contact element is used to derive wheel-rail contact finite element governing equations to further establish the off-axis impact dynamic finite element equation of orbital structure.The influence of falling shaft impact on the track structure of overhead line The dynamic performance of elastic track block and short sleeper embedded track bed structure is compared in detail and verified by the field test.The results show that the track structure of elastic support block can be properly matched by the rigidity under track and under block, The dynamic performance is superior to the ordinary short sleeper structure, and it is ideal for the vibration reduction of the line. At the same time, the finite element model of the impact and the test of the dynamic characteristics of the orbit structure are intuitive and effective.