A Formal Approach for Automating Compositional Safety Analysis Using Flow Type Annotations In Component Fault Trees

  • Safety assurance is a major challenge in the design of modern embedded systems that has become increasingly difficult in recent years. Growing system sizes and the rise of Cyber-Physical systems confront safety engineers with large sets of configurations to be analyzed. Current approaches are usually carried out at design time and do not address the need for automated assessments in the field. With Component Fault Trees (CFTs) there exists a component-based methodology that enables an efficient modular composition of safety artifacts. The combined model is a system-level CFT that can be analyzed by means of popular Fault Tree Analysis techniques that are widely accepted in the industry. However, when composing models, their interfacing elements must be connected manually which impedes the automation of the procedure. In this work, we introduce the notion of flow types that represent a particular kind of component interaction and define a taxonomy of related failure behavior. By annotating CFTs with types, a machine-readable vocabulary is provided that allows for an automated interconnection of their interfaces. This way, the automatic composition of models according to system architecture is enabled, allowing for automated safety assessments on system-level. We demonstrate the feasibility of our approach using an example ethylene vaporization unit.

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Author:Felix Möhrle, Kai Bizik, Marc Zeller, Kai Höfig, Martin Rothfelder, Peter Liggesmeyer
Parent Title (English):Proceedings of the 27th European Safety and Reliability Conference (ESREL): Safety and Reliability – Theory and Applications., Portorož, Slovenia: Taylor & Francis (CRC Press).
Document Type:Conference Proceeding
Publication Year:2017
Tag:CFT; Compositional safety analysis; Flow type annotations
faculties / departments:Fakultät für Informatik
Dewey Decimal Classification:0 Informatik, Informationswissenschaft, allgemeine Werke / 00 Informatik, Wissen, Systeme / 000 Informatik, Informationswissenschaft, allgemeine Werke