中低速磁浮列车－轨道梁竖向耦合模型与验证

摘要

研究目的：在我国新建中低速磁浮运营线的背景下，因中低速磁浮轨道梁较为轻巧，为保证磁浮列车行车安全及舒适性，需对其进行磁浮列车－轨道梁耦合振动分析验证。本文以株洲某厂磁浮试验线20 m 简支梁为工程背景，建立车辆为12个自由度的二系悬挂质量－弹簧－阻尼模型，并考虑轨道不平顺对车桥振动的影响，建立磁浮列车－轨道梁竖向耦合振动分析模型，且编制仿真分析软件 VTBIM，通过仿真值与现场试验实测值的对比，验证所建模型的合理性。研究结论：（1）现场试验测试轨道梁基频、振型及轨道梁跨中动挠度／加速度，轨道梁基频及振型测试结果比仿真值略小；（2）磁浮车辆通过简支梁时，梁跨中竖向挠度／加速度的实测值均略小于仿真值，仿真值随车速的变化规律与实测值规律一致，挠度时程曲线仿真值与实测波形基本一致；（3）研究结果表明本文所建立的中低速磁浮列车－轨道梁竖向耦合振动模型合理，编制的仿真分析软件的计算结果可信；（4）该研究结果可用于中低速磁浮轨道梁设计参考。%Research purposes:In our country under the background of new construction of medium and low speed maglev operation,because the low speed maglev rail beam is relatively light,in order to ensure the safety and comfort,the maglev train -track beam coupling vibration should be analyzed and verified.Based on the engineering background of 20 m simply supported beam of maglev test line in a factory of Zhuzhou,this paper establishes the secondary suspension quality -spring - damper model that vehicle is 12 degrees of freedom,builds maglev trains and track beam vertical coupling vibration analysis model considering the impact of track irregularity,and designs the simulation analysis software VTBIM.Through comparing the simulation value with the measured values,the rationality of the model is verified. Research conclusions:(1 )Test the fundamental frequency,vibration mode and span dynamic deflection /acceleration of the beam,and the fundamental frequency and vibration mode test results are slightly smaller than the simulation values.(2 )When maglev vehicles go through the simply supported beam,the measured values of span dynamic deflection /acceleration of the beam are slightly smaller than the simulation values,the theoretical simulations variation law with the speed is consistent with the measured law,time -history curve of the deflection is consistent with the measured curve.(3)The vertical model of the medium and low speed maglev train - track beam coupling vibration which is built in this paper is reasonable,the result of simulation program in this paper is effective.(4)The result can be applied to medium and low speed maglev track beam design.