轨道随机不平顺与车辆动力响应的相干分析

介绍了现场实测的轨道随机不平顺数据和根据轨道不平顺模拟的轨道不平顺随机时域函数 ,作为车辆 -轨道系统动力仿真计算的激扰输入 ,计算轮轨作用力及车辆的各种响应 .利用中国高速低干扰轨道不平顺谱、中国某干线实测轨道不平顺谱和美国六级轨道不平顺谱作为仿真计算的激扰 ,计算了各种速度下的轮轨力和车辆动力响应 ,并进行了比较 .最后通过对轨道不平顺与车辆动力响应的相干性分析 ,得出了轨道随机不平顺影响轮轨作用力和车辆运行品质的最不利波长

Analysis of Coherence between Track Random Irregularity and Vehicle Dynamic Response

The track irregularity function measured by the railway inspection car and that transferred from the track irregularity power spectral density(PSD) are used as the exciting functions of the vehicle-track coupled dynamic simulating model to calculate the forces between wheel and rail and the dynamic response of the vehicle.The low exciting track irregularity PSD of China's high-speed railway,the sixth grade track irregularity PSD of U.S. railway and the track irregularity PSD coming from China's certain trunk railway are used as an exciting function to calculate the wheel/rail forces and dynamic response of vehicle under different train speeds.The simulating results are also compared with each other.The coherence calculation is made for analyzing the relationship between vehicle response and the track irregularity,and the most detrimental random irregularity wavelengths that affects the wheel/rail forces and vehicle response is confirmed in the paper.