The Systems Modeling Language (SysML) is a general-purpose modeling language for systems engineering applications. It supports the specification, analysis, design, verification and validation of a broad range of systems and systems-of-systems.
The SysML was originally developed as an open source specification project. SysML contains nine diagram types, seven of which it shares in common with its parent language UML (Unified Modelling Language), along with one tabular notation.
The diagram types are as follows:
- SysML Diagram
- Behavior Diagram
- Requirement Diagram
- Structure Diagram
- State machine Diagram
- Package Diagram
- Sequence Diagram
- Use Case Diagram
- Parametric Diagram
The Requirement Diagram and Parametric Diagram are new with SysML.
There’s also an Activity Diagram, Block Definition Diagram and Internal Block Diagram, which comes from a modified UML2 language.
This is the basic unit of system structure in SysML and can be used to represent hardware, software, facilities, personnel, or any other system element. The 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 organize the model.
The behavior diagrams include the use case diagram, activity diagram, sequence diagram, and state machine diagram. A use-case diagram provides a high-level description of functionality that is achieved through interaction among systems or system parts. The activity diagram represents the flow of data and control between activities.
A sequence diagram represents the interaction between collaborating parts of a system. The state machine diagram describes the state transitions and actions that a system or its parts perform in response to events.
SysML includes a graphical construct to represent text based requirements and relate them to other model elements. The requirements diagram captures requirements hierarchies and requirements derivation, and the satisfy and verify relationships allow a modeler to relate a requirement to a model element that satisfies or verifies the requirements.
The requirement diagram provides a bridge between the typical requirements management tools and the system models.
The parametric diagram represents constraints on system property values such as performance, reliability, and mass properties, and serves as a means to integrate the specification and design models with engineering analysis models.
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