Structure and Block Definition Diagram¶

ESL¶

ESL only allows for the definition of a single decomposition: a system decomposition tree (product breakdown structure) consisting of components. The components represent parts of the system. Each component must have a definition and must be instantiated as a subcomponent within a (higher-level) parent component. Within the component definitions, the function, design, and behavior specifications are stated.

SysML¶

In SysML, the structure of the system is defined in a Block Definition Diagram (BDD). The BDD contains blocks, which are the equivalent of ESL-components. The blocks can be decomposed into more blocks, and contain ValueProperties, FlowProperties and Behaviours. These properties will be elaborated later on.

The relationship between a block and a childblock is visualized using diamond connectors, also known as Composite Associations. The parts can also be listed in the parts section of a block.

SysML structure — The figure shows the BDD-diagram of the pump and drive-mechanism.

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