轨道不平顺引起的车轨桥空间耦合振动分析

Coupling Vibration Analysis of Vehicle-Track-Bridge System Due to Track Irregularities

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 effect of track irregularity on coupling vibration of vehicle-track-bridge system needs to be studied. In this paper, spatial model of vehicle-sludgeless track-bridge system is established. The track irregularity samples in time domain are established by power spectrum density and taken as the exciting source to analyze the spatial coupling vibration of vehicle-track-bridge system. By comparing the vibration responses of the model excited by vertical profile irregularity and the model excited by four different irregularities, the change of track irregularities has influence mainly on the vibration of the parts above the rail and nearly no influence on the parts under the rail and bridge.