1.MOT Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport, Beijing Jiaotong University, Beijing 100044, China
2.Integrated Transport Research Center of China, Beijing Jiaotong University, Beijing 100044, China
3.Department of Traffic and Transportation Planning, Shenyang Urban Planning & Design Institute Co. , Ltd. , Shenyang Liaoning 110000, China
Regarding the complexity and precision required for metro train failure rescue schemes and rescheduling under multi-formation modes, the diversity of available rescue schemes across various failure scenarios is considered. Taking key elements of the predetermined rescue scheme as input parameters, an optimization model for timetable rescheduling is constructed with the objectives of minimizing both train delay time and total passenger travel time. The Non-dominated Sorting Genetic Algorithm Ⅱ integrated with variable neighborhood search strategies is designed. Furthermore, a comparative analysis is conducted on effects of rescheduling strategies including cancellations, early depot return, minor-route turnback, and flexible connection based on train holding and additional backup trains. The results indicate that compared with the nearest connection strategy, the flexible connection strategy increases the matching probability of formation types by at least 20.04%. Applying rescheduling strategies like cancellations, early depot return, and minor-route turnback specifically to short-formation trains can mitigate delay propagation with less impact of rescheduling on passenger travel. In scenarios where a short-formation train fails and the ahead parking track is sufficiently long to accommodate a long-formation train, decoupling the following long-formation train for rescue yields better rescheduling outcomes than direct rescue. Direct rescue by the following train proves better rescheduling effects than alternative modes such as direct rescue by the preceding/opposite train or rescue via following/preceding coupling. The variable neighborhood search strategies integrated into the designed algorithm significantly enhance the overall quality of the obtained Pareto solution set.
(3)考虑到现实情况中前序和对向救援列车牵引故障列车时的限速为40 km · h-1,明显高于后序列车推行救援时的限速25 km · h-1,因此前序/对向列车的救援用时往往较短,即“前序/对向列车直接救援”的救援用时短于“后序列车直接救援”,“前序列车联挂救援” 的救援用时短于“后序列车联挂救援”;然而,前序/对向救援列车接近故障列车的用时较长,会引起故障位置上游列车的扣车时间显著增加,导致这种救援方式下的运行调整效果较差。
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