WSEAS Transactions on Circuits and Systems
Print ISSN: 1109-2734, E-ISSN: 2224-266X
Volume 14, 2015
Safety Analysis on Regional Computer Interlocking System Based on Dynamic Fault Tree
Authors: ,
Abstract: Regional Computer Interlocking System (RCIS) is a signal control system which performs all interlocking logic operation and implements centralized control for multiple stations only using one set of interlocking equipment. Recently, the main method to analyze safety of dynamic redundancy systems structure is based on the Markov model at home and abroad. But in applying the Markov model to analyze the safety of regional computer interlocking system, the size of state space is quite larger such that the modeling and solving processes become very complex. To solve this issue, in this paper, Dynamic Fault Tree (DFT) model of RCIS is established from the perspective of system failure, and probabilistic approximation method is used to solve the probability of falling safety (PFS) and probability of falling danger (PFD). Eventually, a comparison is conducted between DFT probabilistic approximation method and Markov method. The relative researches show that DFT probabilistic approximation method possesses roughly same outcome with ones of Markov method, and tends to be more conservative in calculating probability indexes, which provides a new solution for complex dynamic redundancy system safety analysis.
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Keywords: Regional Computer Interlocking System(RCIS), Dynamic Fault Tree(DFT), Probabilistic approximation method, Probability of falling safety(PFS), Probability of falling danger(PFD)
Pages: 414-426
WSEAS Transactions on Circuits and Systems, ISSN / E-ISSN: 1109-2734 / 2224-266X, Volume 14, 2015, Art. #48