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轨道不平顺对车轨桥空间耦合振动的影响是一个有待研究的问题。本文建立了车辆-无碴轨道-桥梁系统的空间耦合振动模型,并通过功率谱密度得到轨道不平顺的时域模拟样本,以其为激励源,分析车辆-轨道-桥梁空间耦合振动响应。通过对比,考虑高低不平顺的空间模型与4种几何不平顺的计算结果,由此得到,轨道不平顺的改变主要影响轨上部分的振动,对轨下部分以及桥梁结构影响不大。
The influence of track irregularity on the coupling vibration of the rail bridge is an issue to be studied. In this paper, the space coupling vibration model of vehicle-ballastless track-bridge system is established, and the track irregularity time-domain simulation sample is obtained by power spectral density. Using it as excitation source, the space-coupled vibration response of vehicle-track-bridge is analyzed. By comparison, taking into account the high and low spatial model and the four geometric irregularities, we can see that the change of orbit irregularity mainly affects the vibration of the upper part of rail, and has little effect on the part under the rail and the bridge structure.