Abstract
Network-wide maintenance lacks strong theoretical support and practical cases. However, research on this topic has entered an extensive exploratory stage; for example, new network design methods are being sought, and successful practices from traditional maintenance by line and by profession are being incorporated. This paper proposes a novel set-covering model with the variable coverage radius for the maintenance network of urban rail transit systems in the context of network-wide maintenance. The concepts of network-wide maintenance follow principles that are similar to those of bio-geography-based optimization (BBO), i.e., patterns of migration, variation, and extinction of different populations in different habitats. Therefore, a BBO algorithm is implemented with combinatorial optimization programming. Experiments from Changchun city in China show that the proposed model and algorithm are effective in fulfilling network-wide requirements through a direct tradeoff between the coverage radius and maintenance response time. In addition, the maintenance capacity and variable coverage radius of each maintenance point influence both the maintenance timeliness and resource utilization of maintenance units.
Highlights
As of December 31, 2018, according to a statistical analysis of urban rail transit lines, 169 urban lines in 32 cities in mainland China were in operation, having a total length of 5494.9 kilometers
Basic assumptions such as coverage and guarantee rules are constructed, and a maintenance network design model for urban rail transit systems based on the variable coverage radius is established and developed
The maintenance network design problem can be classified as a discrete multifacility location problem, and its theoretical model can be summarized as three classic models: the P-center model [1], the P-median model [2], and the set-covering model [3]. e set-covering model concerned in this paper is the most widely used in site selection or network location, and it is applicable to firefighting units, police stations, hospitals or emergency centers [4], telephone exchange centers, gas stations, and other research objects [5]
Summary
As of December 31, 2018, according to a statistical analysis of urban rail transit lines, 169 urban lines in 32 cities in mainland China were in operation, having a total length of 5494.9 kilometers. Based on the concept of network-wide maintenance, in contrast to the modes of maintenance by line and by profession, the problem of how to construct a robust maintenance network for urban rail transit networks arises, which is an important part of the health management of such networks. Basic assumptions such as coverage and guarantee rules are constructed, and a maintenance network design model for urban rail transit systems based on the variable coverage radius is established and developed.
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