基于虚拟激励法的车-轨-桥耦合系统的随机振动响应分析

Random Vibration Analysis of Vehicle-Track-Bridge Coupling System Based on Pseudo-Excitation Method

轨道随机不平顺作为引起车辆-轨道-桥梁耦合系统振动的最重要的激励源,对列车过桥平稳性有着至关重要的影响.建立车辆-轨道-桥梁耦合垂向振动模型,采用虚拟激励法,计算随机不平顺激励下车辆运行的平稳性以及轨道和桥梁结构的振动特性,避免了繁复的时频转换和复杂的数值积分.数值分析了不同速度下列车过桥的平稳性和列车对不平顺波长的敏感范围.经过分析得到,列车运行速度越大,过桥平稳性指标越大,即舒适性越差;而且影响列车平稳性的不平顺波长越长,其影响范围越大.

As the most important excitation source for the irregularity of the track has a vital influence on the ride quality vibration of vehicle-track-bridge coupling system, the stochastic of the vehicle. In this paper, a vehicle-track-bridge coupling model was established. To avoid the complicated time-frequency transformation and numerical integral calculation, the pseudo-excitation method was used to calculate the vibration characteristics of the vehicle, track and bridge under the random irregular excitations. The ride qualities and the sensitive range of the irregularity wavelength at different vehicle velocities are presented. Results reveal that if the vehicle velocity increases, the Sperling index goes higher as well, and results in a longer wavelength and wider range of the vehicle sensitive irregularity.