시뮬레이션 기반 철도 선로용량의 최적 활용범위 설정

Abstract

Railway operation deals with determining optimal degree of capacity utilization for given infrastructure. This is to fully use railway infrastructure and to minimize the decreasing operation quality which is caused by conflicts between trains. For this, we need a maximum capacity for given infrastructure and a waiting time function on train traffic. In this paper, the parameters of waiting time function are estimated using average waiting time per train and maximum capacity obtained from timetable simulation. Based on this waiting time function, the lower and upper bounds of capacity utilization rate are derived, which show minimum relative sensitivity of waiting time and maximum average normalized traffic performance, respectively. Therefore, the reasonable capacity utilization rate of railway infrastructure should be decided between these lower and upper limits. Simulation-based estimation for optimal capacity utilization range in this paper could be used to determine the utilization of existing infrastructure including large stations with complicated track-layout and railway lines with network structure, which will help us to identify additional investment needs for rail infrastructure.