基于6自由度振动试验台的轨道几何不平顺复现方法及应用研究

A track geometric irregularity reproduced method and its application based on 6DOF vibration test bench

为了在试验台上模拟列车实际运行时的振动环境,实现在室内测试车辆系统整体或零部件的振动响应,考虑将轨道几何不平顺在6自由度振动试验台上复现。结合轨道几何不平顺的特点及振动试验台的自身结构,研究了该试验台的运动控制方法以及在该试验台上复现轨道几何不平顺的方法;通过搭建试验台全尺寸虚拟样机模型,对实测的武广高速铁路不平顺信号进行了成功复现;在此基础上建立了某型整备状态下的列车转向架刚柔耦合动力学模型,以虚拟试验台复现的轨道几何不平顺为激励,模拟线路试验对转向架构架进行工作模态分析,最终得到,在该轨道不平顺激励下,该型转向架以速度为250 km/h运行时,会激发出转向架构架固有频率为18 Hz,67 Hz,85 Hz以及97 Hz对应的模态。

It is considered to reproduce the track random irregularity on a test bench to simulate the vibration environment of the train and to test the vibration response of the whole or parts of a vehicle system.Combined with the characteristics of track geometric irregularity and the structure of the vibration test bench,a motion control method of the test bench and a method to reproduce track geometric irregularity on the test bench were studied.Based on the full-scale virtual prototype model of the test bench,the measured irregularity signals of the high-speed railway from Wuhan to Guangzhou were successfully reproduced.On this basis,the rigid flexible coupling dynamic model of a certain type of train bogie under the condition of servicing was established.Modal analysis of the bogie frame was carried out with track geometric irregularity reproduced by a virtual test bench as excitation.The analysis shows that under the excitation of track irregularity,the corresponding modes of 18 Hz,67 Hz,85 Hz,and 97 Hz of the bogie frame will be excited when the bogie runs at 250 km/h.