Influence of train length on in-train longitudinal forces during brake application
Influence of train length on in-train longitudinal forces during brake application
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DOI：
10.1080/00423114.2018.1456667
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发表时间：
2019-02
影响因子：
3.6
通讯作者：
R. Serajian;S. Mohammadi;A. Nasr
中科院分区：
文献类型：
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作者：
R. Serajian;S. Mohammadi;A. Nasr
摘要由制动装置产生的信号从列车系统的第一部分(机车)到末端(最后一节车厢)需要几秒钟的时间。系统(列车)制动各部件的时间延迟可能会恶化长途列车的纵向动力相互作用。例如，这会导致后车向前车行驶，从而在缓冲器和车钩处产生很大的列车内力。在铁路系统检修中，铁道车辆的主要部件都有相对的压力和拉力，这些压力和拉力作用于整个列车系统，给行业带来了巨大的费用。对于长距离列车，在安全区运行是与列车沿线作用力的另一个重要关系。本研究主要以货运列车为研究对象，利用MatLab进行仿真，研究长度对列车动态特性的影响。我们对伊朗伊斯兰共和国RiRi铁路目前使用的列车进行了研究。我们模拟了四种不同的情况，每种情况下，列车分别由52、32、20和12节车厢组成。根据研究结果，这里显示了两种不同的力(拉力和压力)。模拟显示了系统动力学中不同形式的相互作用。然后将这些图形进行比较，得出制动时整个系统(列车包括不同数量的货车和机车)的长度对沿线系统动力学的详细影响。
ABSTRACT It needs some seconds for a signal, which is created from brake application, to travel from the first part of the train system (locomotive) to the end part of it (last wagon). Delay in time of all parts of the system (train) brake is seen which might deteriorate the longitudinal dynamic interaction of the long trains. For instance, this results in running of the rear cars to the front ones and hence producing large in-train forces at the buffers and couplers. Major parts of the rolling stock in railway system repair are known for relative compression and tension forces, which are applied to the whole train system and cause huge expenses for the industry. For trains with long lengths, operating in safe area is another important relation with train forces along the system. By using MATLAB simulation in this study, we investigated the length's effect on train dynamic along the system mainly for freight trains. We did our research on the trains which are currently used in Railways of Islamic Republic of Iran, RIRI. Four diverse cases were under our simulation, in each of which, trains consist of 52, 32, 20 and 12 cars, respectively. Two different forces (tension and compression) are displayed here as of the outcome of the research. Simulations show different forms of interplays in dynamics along the system. Then we compared the graphs to each other to find out detailed influences of length of the whole system (train including different number of wagons and locomotive) on dynamics of system along it while braking is applied.