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在车辆的走行过程中,上部与下部是相互作用和影响的,因此,轨道交通问题实际上就是线路上下部结构和车辆系统的体系匹配问题。本文针对列车走行的实际情况,将轨道-路基作为参振子结构纳入车辆计算模型,建立了包含车辆、钢轨、轨枕、道床和路基作为一体的二系垂向耦合动力分析模型。作为模型的验证,结合京秦线提速改造工程进行了列车-路基动力仿真计算,得出在不同行车速度条件下,机车车辆通过路基段加固前后状态下的车体加速度、动轮载、轮重减载率及道床和路基主要动力性能指标,并与实车试验进行对比。试验测试结果验证了理论模型和分析方法的有效性,为高速铁路路基的动力特性分析和设计提供一些参考。
In the process of vehicle running, the upper part and the lower part interact and influence. Therefore, the problem of rail transit is actually the system matching problem between the upper and lower structure of the line and the vehicle system. In this paper, according to the actual situation of the train running, the track-subgrade is taken as the parametric sub-structure into the vehicle calculation model, and a two-component vertical coupled dynamic analysis model including vehicle, rail, sleeper, ballast and roadbed is established. As a validation of the model, the simulation of train-subgrade dynamic simulation is carried out in conjunction with the speed-up reconstruction project of Beijing-Qinhuangdao Railway Line. The vehicle acceleration, dynamic wheel load and wheel weight reduction of the rolling stock under the condition of different driving speeds are obtained Load rate and main dynamic performance of roadbed and subgrade, and compared with the actual vehicle test. The test results verify the validity of the theoretical model and the analytical method, and provide some references for the analysis and design of dynamic characteristics of high-speed railway subgrade.