武汉轻轨系统轨道结构随机振动研究

利用模态分析法,建立了车辆-轨道垂向耦合动力计算模型。在模型中,车辆为附有二系弹簧的整车模型,钢轨被离散为双层弹性基础上的欧拉梁。以随机振动理论为基础,分析了列车荷载作用下武汉轻轨系统轨道结构的垂向动力响应特征,得到了车辆、钢轨、轨枕、道床的响应功率谱密度函数以及轮轨之间的动作用力功率谱密度函数。结果表明,钢轨的垂向振动能量主要集中在高频段区域,由轨面垂向短波不平顺激发。

Research on Track Structure of Wuhan Light Rail Based on the Random Vibration Theory

The vertically dynamic model of track-ground system was developed by means of the modal analysis method, where the rails were considered as Euler beams with finite length rested on double layer elastic foundation. Based on the random vibration theory, the vertically dynamic analysis was done for the track-ground system of Wuhan light rail due to traffic loadings, and the random responses of power spectral density of the vehicles, the rails, the sleepers and the ballasts were achieved by this method. The results showed that the PSD of rails mostly focus on high frequency, and excited by vertical short wave irregularities existed on the surface of rails.