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Authors: Cao, Nan
Title: Approach to determine and evaluate the homogeneity of operating programs in railway operation based on infrastructure occupancy
Issue Date: 2017 Dissertation 141
Abstract: Contemporary railway traffic requires different train services share the same infrastructure. Capacity consumption together with the homogeneous level of train traffic gives a picture of the efficient use of infrastructure. Previous research suggests that the utilization is more efficient with a homogeneous operating program. During last decades, many researchers tried to describe and/or define the homogeneity of operating programs in rail service; however, no definition considered the infrastructure occupation. In addition, several methods were developed to evaluate the homogeneity in railway operation considering variations in speed, running time and headway. But, the occupancy of infrastructure has not been discussed in the existing methods. An extension of existing definitions is presented from the perspective of the infrastructure, which can be characterized by variations in blocking time, buffer time and running direction. The blocking time, buffer time and running direction describe the occupancy of train path on track sections based on the blocking time model. Accordingly, the homogeneity of operating programs is evaluated through three parameters, namely the homogeneity of blocking time (HBL), the homogeneity of buffer time (HBU) and the homogeneity of running direction (HRD). The overall homogeneity (OH) combined HBL; HBU and HRD to realize an integrity evaluation of homogeneity of operating programs. The results show that this new methodology can quantify the homogeneity of railway operations, not only for track sections but for an entire network, which contributes significantly to the efficient utilization of infrastructure. With the method developed in this thesis, the interrelationship between homogeneity of operating programs and operation quality were investigated quantitatively. Firstly, both the influence of each parameter of homogeneity and the overall homogeneity were analyzed. The operation quality (delay-coefficient) is evaluated for timetables with different train types, arrangements of buffer times and sequences of train runs. The results show that the operation quality deteriorates with less homogeneous timetables, in which the variation in buffer time has a more significant influence. Finally, the influence of homogeneity of operating programs is studied for different traffic flows. The low traffic flow is more sensitive to the homogeneity of buffer time and the homogeneity of blocking time is more significant for high traffic flow.
Appears in Collections:02 Fakultät Bau- und Umweltingenieurwissenschaften

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