论文部分内容阅读
应用轨道段组合单元,建立了能反映橡胶浮置板式轨道结构竖向振动特性的动力分析模型。在模型中,钢轨模拟为连续弹性支承的Euler梁;浮置板视为弹性薄板,用有限元法中的纵横向有限条带单元进行离散;钢轨扣件及橡胶支座模拟为线性弹簧和阻尼。基于弹性系统动力学总势能不变值原理和形成系统矩阵的“对号入座”法则,建立了地铁列车-橡胶浮置板式轨道竖向振动方程,并对车辆和轨道结构的动力特性进行了数值分析。计算结果表明:地铁列车通过广州地铁二号线橡胶浮置板式轨道时,轮重减载率最大值为0.597,车体竖向振动加速度最大值为0.846 m.s-2,浮置板式轨道系统的隔振效率为20%~27%,因此,车辆-轨道结构竖向振动分析模型能够准确描述地铁车辆和橡胶浮置板式轨道结构间的动力特性。
The dynamic analysis model which can reflect the vertical vibration characteristics of the rubber floating slab track structure is established by using the combination of track segment elements. In the model, the rails are modeled as Euler beam with continuous elastic support. The floating plate is regarded as an elastic thin plate, which is discretized by the finite element method. The rail fastener and the rubber bearing are simulated as linear springs and damping . Based on the principle of invariable value of total potential energy of elastic system dynamics and the law of “condemnation” which forms the system matrix, a vertical vibration equation of subway train-rubber floating slab track is established and the dynamic characteristics of vehicle and track structure are numerically analysis. The calculation results show that when the subway train passes through the rubber floating slab track of Guangzhou Metro Line 2, the maximum value of wheel load deloading rate is 0.597 and the maximum vertical acceleration of vehicle body is 0.846 ms-2. The interval of floating slab track system The vibration efficiency is 20% ~ 27%. Therefore, the vertical vibration analysis model of vehicle-track structure can accurately describe the dynamic characteristics between the subway vehicle and the rubber floating slab track structure.