Transforming functional requirements and risk information into models for analysis and simulation

A method is presented for transforming functional requirements into system-of-subsystems function models. Text from requirements and risk tools is transformed into simple semantic models. An ontology of functions, entities and problems provides structure for the transformation and for deriving functional models. Functions, operands of functions and functional agents can be captured. Generic hazards and vulnerabilities can be identified for types of functions and operands. These models are transformed into functional architectures of connected subsystems. This approach permits application of graph analysis and lightweight simulation to investigate the effects of problems and countermeasures in scenarios. We discuss a hazard identification tool and hybrid simulation tool where these methods are being applied.