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运用弹性系统动力学总势能不变值原理及形成矩阵的“对号入座”法则,建立列车—板式无砟轨道—路基的竖向振动方程组,用Matlab编制相应计算程序,并用ANSYS软件验证,分析在随机不平顺激扰下,列车高速运行时板式无砟轨道不同纵向连接形式对列车—板式无砟轨道—路基系统振动特性的影响。研究表明:板式无砟轨道纵向连接形式对车体垂向加速度、钢轨垂向加速度、轮轨垂向力、扣件压力的影响极小,但对板式无砟轨道各部件及路基受力有较大影响,轨道板与底座纵连,可以大大降低轨道板和底座的振动和动应力,无砟轨道动力特性总体较为优良。
Using the principle of invariable value of total potential energy of elastic system dynamics and the matrix of “condemnation”, the vertical vibration equations of train-slab ballastless track-embankment are established. The corresponding calculation program is compiled by Matlab and verified by ANSYS software. The influence of different vertical connection forms of slab track on the vibration characteristics of train-slab ballastless track-subgrade system under high-speed train operation is analyzed under random disturbance. The results show that the longitudinal connection form of slab ballastless track has little influence on the vertical acceleration of vehicle body, vertical acceleration of rail, wheel-rail vertical force and fastener pressure. However, Large impact, the track plate and the base longitudinal connection, can greatly reduce the track plate and the base of the vibration and dynamic stress, ballastless track dynamic characteristics are generally better.