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Integrating Passengersu27 Routes in Periodic Timetabling: A SAT approach

机译:在定期时间表中整合乘客 u27路线:saT方法

摘要

The periodic event scheduling problem (PESP) is a well studied problem known as intrinsically hard. Its main application is for designing periodic timetables in public transportation. To this end, the passengersu27 paths are required as input data. This is a drawback since the final paths which are used by the passengers depend on the timetable to be designed. Including the passengersu27 routing in the PESP hence improves the quality of the resulting timetables. However, this makes PESP even harder.Formulating the PESP as satisfiability problem and using SAT solvers for its solution has been shown to be a highly promising approach. The goal of this paper is to exploit if SAT solvers can also be used for the problem of integrated timetabling and passenger routing. In our model of the integrated problem we distribute origin-destination (OD) pairs temporally through the network by using time-slices in order to make the resulting model more realistic. We present a formulation of this integrated problem as integer program which we are able to transform to a satisfiability problem. We tested the latter formulation within numerical experiments, which are performed on Germanyu27s long-distance passenger railway network. The computationu27s analysis in which we compare the integrated approach with the traditional one with fixed passengersu27 weights, show promising results for future scientific investigations.
机译:周期性事件调度问题(PESP)是一个经过深入研究的问题,被称为“固有难题”。它的主要应用是设计公共交通中的定期时间表。为此,需要乘客路径作为输入数据。这是一个缺点,因为乘客使用的最终路线取决于要设计的时间表。因此,将PESP中的乘客路线包括在内,可以提高最终时刻表的质量。但是,这使PESP变得更加困难。将PESP定义为可满足性问题并使用SAT求解器已被证明是一种很有前途的方法。本文的目的是研究是否可以将SAT解算器也用于集成时间表和乘客路线选择的问题。在我们的综合问题模型中,我们使用时间片通过网络在时间上分配了起点-目的地(OD)对,以使生成的模型更加真实。我们以整数程序的形式提出了这个综合问题的表述,我们可以将其转化为可满足性问题。我们在数值实验中测试了后一种公式,该数值实验是在德国的长途客运铁路网络上进行的。通过计算分析,我们将集成方法与具有固定乘客权重的传统方法进行了比较,为未来的科学研究提供了可喜的结果。

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