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为确定合理的岔桥相对位置,建立了列车-道岔-桥梁耦合系统的振动分析模型,用数值模拟法,分析了350 km/h、18号渡线道岔布置于6×32 m的连续梁上,岔桥相对位置对列车、道岔及桥梁的各项动力特性的影响.结果表明:岔桥相对位置对最大动轮载、轮缘力、尖轨及心轨开口量、车体运行平稳性的影响不显著,对最大减载率、脱轨系数、钢轨动应力及桥梁振动加速度的影响较大;最优的岔桥相对位置是道岔辙叉部分布置在列车运行方向上距离第3跨桥墩1/8~1/4跨范围内.
In order to determine the reasonable relative position of turnout bridge, the vibration analysis model of train-turnout-bridge coupling system is established. By numerical simulation, 350 km / h and 18 # turnout are arranged on 6 × 32 m continuous beam , And the relative position of turnout bridge on the dynamic characteristics of trains, turnouts and bridges.The results show that the relative position of turnout bridge has influence on the maximum dynamic wheelset load, wheel rim force, rail and rail opening, and vehicle body running stability And the impact on the maximum load shedding rate, derailment coefficient, rail dynamic stress and bridge vibration acceleration are great. The relative position of the optimal turnout is that the frog part of the switch is arranged in the train running direction from 1/8 of the third pier ~ 1/4 across the range.