Reliability evaluation method for the railway system: A model for complicated dependency

Abstract

In the field of international standards such as IEC standards, safety is generally explained with risk. In the risk analysis process, it is a very important task to calculate the reliability of large-scale systems which include equipment and operators. As for the railway risk analysis, there are many cases that conventional techniques, such as event trees (ETs), and fault trees (FTs), which are broadly used as practical tools, can not be applied adequately. This is because, for the railway system, there are a number of subsystems with complicated dependencies. Then, we developed a new network-type reliability evaluation model, Typed State Influence Diagram (TSID), which can explicitly express such a complicated dependency.