兰新铁路第二双线大风环境下动车组“晃车”现象分析

Analysis of “Car Swaying” of EMUs on the Second Lanzhou-Urumqi High-Speed Railway under Strong Wind Environment

兰新铁路第二双线联调联试和防风安全试验时发现,在大风环境下当动车组通过线路部分区段时,车体瞬间晃摆剧烈,造成列车降速并严重影响乘坐舒适性。为此,以实车试验和实地风场测量为主要研究手段,就"晃车"这一现象开展研究,得出"晃车"现象主要出现在动车组通过不同防风结构过渡段位置或地形地貌突变地段时、晃车造成的车体振动主要表现为0.6Hz的低频侧滚、不同类型防风结构间过渡越剧烈或地形地貌变化尺度越大动车组车体"晃车"越剧烈等结论,并提出了防风工程改良的措施和建议。

Amid the integrated testing and commissioning of the second Lanzhou-Urumqi high- speed railway and in its windproof safety test, violent car swaying is noticed in passing by some sections of the line in windy conditions, which results in speed reduction and undermines the riding comfort. In this respect, the phenomenon is studied using the vehicle test and in-situ wind field measurements. The results show that the ＂car swaying＂ mainly occurs when the vehicle passes through the transition zones of the windbreak structures or that of landform where the vehicle takes a 0.6Hz low-frequency rolling. That is to say, the more different the transition may be, the more fiercely vehicle body sways. Finally in this paper, the measures and suggestions for the improvement of windbreak structure are put forward.