高速铁路路基结构空间时变系统耦合动力分析

A Spatial Time-Varying Coupling Model for Dynamic Analysis of High Speed Railway Subgrade

考虑高速线路的实际工况 ,建立了包括轨道结构和车辆的路基结构空间时变动力系统分析模型。将线路结构及车辆离散为不同的单元 ,采用能量原理导出了系统动力方程 ,进一步建立了系统动力矩阵。作为模型的验证 ,对连续谐波不平顺条件下系统动力响应进行了分析 ,得出了车辆走行过程中的车体加速度、动轮载以及基床动应力、基床动变形等动态响应结果。计算结果表明 ,本文中的计算模型是合理的。

According to the working condition of high speed railway, a spatial time varying model of subgrade/track/vehicle coupling system is established for dynamic analysis of subgrade. In the spatial model, the railway structure and vehicle are dispersed into different elements, the dynamic equation of the coupling system is founded with the energy theory, and the vibration equation made up of the coupled matrixes of the system is also established. Under the continued harmonic irregularity, dynamic analyses are performed and used as the verification of the model. The dynamic responses such as the acceleration of the car, the dynamic wheel load, the subgrade dynamic stresses, the subgrade dynamic deformation, etc. , are analyzed during the running of a vehicle. The results show that the calculation model presented in this paper is rational.