Author(s)

S. M. Oh, J. H. Lee, B. H. Park, H. U. Lee & S. H. Hong

Abstract

This paper presents a mathematical model of the long-term track tamping scheduling problem in the Korean high-speed railway system. The presented model encompasses various operational field constraints and moreover improves a state-of-the-art model in extending the feasible space. We show the model is sized up to intractable scale, then propose another approximation model that can be handled with the present computer system and commercial optimization package directly. The aggregated index, lot, is selected, considering the resolution of the planning horizon as well as the scheduling purpose. Lastly, this paper presents two test results for the approximation model. The results show the approximation model to be quite promising for deployment into an operational software program for the long-term track tamping scheduling problem. Keywords: tamping scheduling, mathematical model, index aggregation. 1 Introduction In the ballasted track system, the amount of gauge irregularity increases in proportion to the accumulated tonnage passed. When the amount of gauge irregularity is greater than a certain level, it results in not only the worse quality of traveling, but also a serious effect on traveling safety of trains. Therefore, the maintenance works of track systems are carried out based on the predetermined

Keywords

tamping scheduling, mathematical model, index aggregation.