Model-Based Systems Engineering with GENESYS

Define System Architecture (Composition and Aggregation) SysML offers a means of distinguishing the targets of a Physical Entity’s decomposition 1. Aggregation – The subordinate entities are separable and distinguishable. 2. Composition – The subordinate entities are not separable, but are distinguishable. The “Whole Multiplicity” built in / built from relationship attribute when set to “0” represents Composition; when set to “1” represents Aggregation Aggregation Composition̸̸̸̸

353

Relating Functional and Physical Models

Functional Hierarchy

Physical Hierarchy

_Perform System Context Functions

allocated to (performs)

System Context

Integrated (Root)

decomposed by

built from

_Perform Customer Functions

_Perform Geospatial Library Functions

Geospatial Library

Customers

allocated to (performs) Integrated (Root)

…

allocatedto (performs) Atomic

Command Center

Function A

Function N

Workstation

A component’s top-level functions are identified as “Integrate (Root).” The top-level functions’ leaf-level decomposition is identified as “Atomic.”

354