Analysis of Critical Situations in Discrete Transport Systems

A paper presents an approach to critical situations analysis related to discrete transport systems (DTS). The critical situation is understood as sudden shortage of some system recourses resulting in the transport system performance degradation. The analysis is realized based on availability calculation of DTS. The system is described by the formal model, which includes reliability and functional parameters of DTS. The availability and average availability of the system - defined in a functional way by delayed tasks realization – is discussed as a function of different essential parameters when the DTS is organized. The proposed analysis is based on the modeling and simulating of the system behavior using Monte-Carlo approach. The paper presents some exemplar systems – based on real Polish Post DTS - modeling and results.