Influence of Vehicle Number on the Dynamic Characteristics of High-Speed Train-CRTS III Slab Track-Subgrade Coupled System.
Influence of Vehicle Number on the Dynamic Characteristics of High-Speed Train-CRTS III Slab Track-Subgrade Coupled System.
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DOI：
10.3390/ma14133662
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发表时间：
2021-06-30
期刊：
影响因子：
--
通讯作者：
Lou P
中科院分区：
文献类型：
--
作者：
Xu Q;Sun H;Wang L;Xu L;Chen W;Lou P
本文建立了高速列车-CRTSⅢ型板式轨道-路基耦合动力模型。利用该模型，从理论上研究和分析了常规和减振CRTS III板式轨道在光滑和随机轨道不平顺条件下车辆数量对列车-CRTS III板式轨道-路基耦合系统动力特性的影响。结果得出一些结论：（1）当车辆数量超过三辆时，所有项目和工况下耦合系统的最大动态响应不再发生变化，三辆车足以保证仿真精度来研究耦合系统的动态响应。 (2)车体加速度与车辆数量几乎没有关系，只需一辆车即可利用列车-CRTSⅢ板式轨道-路基耦合动力学模型研究车辆动力学。 (3) 对于路基上的常规 CRTS III 板式轨道，车辆数量对钢轨、板和混凝土基层的加速度、钢轨的正负弯矩、扣件的压缩力、板的正弯曲应力影响较小，但对扣件的拉力、板和混凝土基层的负弯曲应力影响较大。研究轨道动力学时只需要一辆车，而不考虑扣件拉力、板和混凝土底座的负弯曲应力，否则需要两辆车或更多车。 (4) 对于路基上的CRTSⅢ板式轨道减振，车辆数量对所有轨道部件的动力响应有一定影响，至少需要两辆车来研究轨道动力学。
In this paper, a high-speed train–CRTS III slab track–subgrade coupled dynamic model is established. With the model, the influence of vehicle number on the dynamic characteristics of a train–CRTS III slab track–subgrade coupled system with smooth and random track irregularity conditions for conventional and vibration-reduction CRTS III slab tracks are theoretically studied and analyzed. Some conclusions are drawn from the results: (1) the largest dynamic responses of the coupled system for all items and cases are no longer changed when the vehicle number exceeds three, and three vehicles are adequate to guarantee the simulation precision to investigate the dynamic responses of the coupled system. (2) The acceleration of the car body has almost no relation with the vehicle number, and only one vehicle is needed to study the vehicle dynamics using the train–CRTS III slab track–subgrade coupled dynamic model. (3) For the conventional CRTS III slab track on a subgrade, the vehicle number has a negligible influence on the accelerations of the rail, slab, and concrete base, the positive and negative bending moments of the rail, the compressive force of the fastener, and the positive bending stress of slab, but it has a large influence on the tension force of the fastener, and the negative bending stresses of the slab and concrete base. Only one vehicle is needed to study track dynamics without considering the tension force of the fastener, the negative bending stresses of the slab and concrete base, otherwise, two or more vehicles are required. (4) For vibration reduction of the CRTS III slab track on a subgrade, the number of vehicles has some influence on the dynamic responses of all track components, and at least two vehicles are required to investigate the track dynamics.
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