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21/11/2008
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Designing mission and safety critical systems using SysML.
 Mission and safety critical applications require a holistic approach to their design and development and OMG SysML provides the ideal environment.
An extension of UML2, it provides a standard modelling language for engineers to analyse, specify, design and verify complex systems. It enhances systems quality, improves the ability to exchange systems engineering information amongst tools and helps bridge the semantic gap between systems, software and other engineering disciplines.
OMG SysML includes diagrams that can be used to specify system requirements, behaviour, structure and parametric relationships – the four pillars of SysML.
The system structure is represented by block definition diagrams and internal block diagrams. A block definition diagram describes the system hierarchy and system/component classifications.
The internal block diagram describes the internal structure of a system in terms of its parts, ports and connectors. The package diagram is used to organise the model. The behaviour diagrams include the use case, activity, sequence and state machine diagrams. A use case diagram provides a high level description of system functionality, while the activity diagram represents the flow of data and control between activities. A sequence diagram represents the interaction between collaborating parts of a system, while the state machine diagram describes the state transitions and actions that a system, or its parts, performs in response to events. Meanwhile, the requirement diagram captures requirements hierarchies and the derivation, satisfaction, verification and refinement relationships, and the parametric diagram represents constraints on system parameter values such as performance, reliability and mass properties to support engineering analysis.
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Author
Matthew Hause
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