A Model-based Framework For
The Safety Analysis Of Computer-based
Railway Signalling Systems
Author(s)
R. Niu & T. Tang
Abstract
Ensuring safety in railway signalling systems is always considered as significant
as a guarantee of the safe and efficient operation of the whole railway. In fact,
safety analysis of the signalling system with distributed computer technique is
becoming extraordinarily difficult, because of the frequent and complex
interaction between components and the various backup modes. The dominant
approaches are subjective, difficult to reuse and not well structured, thus leaving
the safety analysis process time-consuming and error-prone. This paper develops
a hierarchical methodology for safety analysis based on the failure propagation
model and state-transition model. Unlike traditional safety analyses, the
proposed approach demonstrates more accurate representation of practical failure
behaviour in a computer-based signalling system. Dynamic properties, system
structure and failures at the component level are separately modelled in different
layers, and connected with synthesis laws. The analysis can be easily refined as
the system design progresses and automatically produces safety-related
information to help the engineer in making design decisions. The preliminary
design of the Communication Based Train Control (CBTC) system for the
Yizhuang Line in Beijing is used to demonstrate this approach.
Keywords: signalling system, automatic safety analysis, model-based, FPTN.
1 Introduction
Railway systems have a very low tolerance for accidents, because of the
potentially large numbers of injuries and deaths, huge financial losses and even
worse social effects. Achieving a high degree of safety is one of the most
Keywords
signalling system, automatic safety analysis, model-based, FPTN
Related Book
Other papers in this volume
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