随着市域铁路的蓬勃发展，其在运营过程中的救援场景亟需研究分析。市域铁路的“公交化运营模式”导致运行时间较短，与城轨交通类似，因此对救援的及时性要求比动车组更高，而现有市域动车组能力不能完全满足以上运营需求。本文建立了多编组列车连挂时的纵向动力学模型，并以北京大兴机场线为例，分析了在救援工况下，现有运营方式可能带来的列车溜逸风险，结果表明：在33‰坡道上连挂时，列车将会产生较大冲击率，同时发生溜逸；在坡道停车时，由于存在制动-牵引切换过程，列车制动力的短暂丢失同样带来了溜逸风险。结合相关标准，本文分析了在救援过程中乘客的舒适性，结果表明当连挂速度达到4km/h后，乘客舒适性明显降低。最后结合实际运营需求，本文提出了市域列车救援连挂的速度限制，并设置了一种救援工况下的保持制动模式以满足列车安全性与舒适性。

With the vigorous development of urban railways, the rescue scenarios during their operation urgently need to be analyzed. The "public transportation operation mode" of urban trains results in shorter running times, as same as to subway rail trains, which requires higher timeliness for rescue than high-speed trains. However, the capacity of urban trains cannot fully meet the above operational needs. This article establishes a longitudinal dynamic model for multi-formation train coupling, and Beijing New Airport Line was token as an example to analyze the potential risk of train slip caused by the existing urban rail transit operation under rescue scenario The results show that when coupled on the maximum slope, the train will slip and generate a high impact rate, which will reduce passenger comfort. When parking on a slope, the brief loss of train braking force also poses a risk of slipping due to the brake-traction switching process. At the same time, the comfort of passengers during the rescue process was analyzed, and the results showed that when the coupling speed reached 4km/h, the comfort of passengers significantly decreased, exceeding the limit. A speed limit for commuter train rescue coupling based on actual operation was developed, as well as a holding braking mode under rescue treatment to meet the safety and comfort of the passengers.

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