Automated Event Tree Analysis Based-on Scenario Specifications

Event tree analysis is widely used for reliability and safety analyses as it can be used to specify how the system behaves under various failure conditions. Even though event tree analysis is automated, the construction of event trees is unfortunately manual, and thus error-prone. This paper proposes an automated technique to generate event trees from scenario specifications even before system design and implementation. Thus, an engineer can examine the event tree to evaluate system attributes such as reliability and safety during analysis. This technique starts by specifying system scenarios using the ACDATE model (Actors, Conditions, Data, Actions, Timing and Events), and then the model is executed to produce event trees based on various failure models. The tree generated can be used to generate the effectcause diagram, and these two models can be used together to pinpoint the failed components in case of system failures.