Relocation of Resources in a Hierarchically Managed Transportation System Under Critical Conditions

Critical state of operation is reached by a system when it is exposed to an unexpected coincidence of faults (such as periodic rapid increase of the service demand, unavailability of a significant proportion of vehicle operators, simultaneous breakdown of all or a large part of the vehicle fleet). T...

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Bibliographic Details
Published in:Transport and telecommunication 2013-12, Vol.14 (4), p.282-291
Main Authors: Caban, Dariusz, Walkowiak, Tomasz
Format: Article
Language:English
Subjects:
discrete transportation
reliability analysis
risk management
simulation tools
Online Access:Get full text
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Description
Summary:Critical state of operation is reached by a system when it is exposed to an unexpected coincidence of faults (such as periodic rapid increase of the service demand, unavailability of a significant proportion of vehicle operators, simultaneous breakdown of all or a large part of the vehicle fleet). This leads to complete disruption of the transportation system, which persists even after the faults are removed. The duration of critical state of operation is defined as the time needed to resume normal operation after such an incident. It is shown that this time can be predicted using the simulation tools. Furthermore, a contingency plan is proposed, based on relocation of some resources between independent parts of a hierarchically organized transportation system. This contingency plan is analysed to determine the optimal percentage of resources to be relocated and the duration of this relocation.
ISSN:1407-6160
1407-6179
DOI:10.2478/ttj-2013-0024