IBD: Figure 59: Internal structure of hydraulics system (with :values compartment showing)

The slide shows a trail version of Internal Block Diagram (IBD) Figure 59: Internal structure of hydraulics system with the SysML :values compartment showing, exploiting this capability of SysML-1.6:

SysML-1.6: 'SysML permits any property shown on an internal block diagram to also show compartments within the property box. These compartments may be given standard or user-customized labels just as on block definitions. All features shown within these compartments shall match those of the block or value type that types the property.'

SysML-1.6: 'The label of any compartment shown on the property box that displays contents belonging to the type of the property is shown with a colon character (“:”) preceding the compartment label.'

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This enables one to easily see the difference between the underyling "shared" gravity and fluidDensity defaults - which also "shine through" to the initialValues compartment unless overridden - and the per-tank context-specific values for fluidLevel and tankSurfaceArea with the context ConnectedTanks.

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BDD: Figure 61: Hydraulics model constraint blocks

Notes

[CAPABILITY, FEATURE, STYLE, TIP] TIP: MagicDraw/Cameo: Consider showing the Port name and type label inside the Port symbol! CAVEAT: This loses the direction indicators on Ports typed by Blocks with flow properties (but is fine if ItemFlows show the direction, or for "contract ports").

[ANTI-PATTERN] SysPhS-1.1: In the specification model for Figure 59 the handling of the initial values for some value properties (such as for 'gravity') in Tank usages within context block ConnectedTanks is WET not DRY (breaks Single Source of Truth).

Snippets (quotes/extracts)

[SysPhS-1.1] Figure 59 shows the internal structure of a ConnectedTanks block.

[SysPhS-1.1] Part properties, typed by blocks ... represent components in this system. They are connected to each other through ports, which represent openings in the tanks and pipe ...

[SysPhS-1.1] Item flows on connectors indicate fluid passes through the ports and between the parts. The diagram connects a tank to each end of a pipe.

[SysPhS-1.1] SysML initial values specify property values for components used in internal block diagrams. Figure 59 shows initial values for fluid density, gravity, tank surface area, pipe radius, pipe length, and dynamic viscosity of the fluid ...

[SysPhS-1.1] An alternative for specifying initial values of part properties in the ConnectedTanks is to specialize it and redefine the part properties with default values for various configurations ...

[SysML-1.6] SysML permits any property shown on an internal block diagram to also show compartments within the property box. These compartments may be given standard or user-customized labels just as on block definitions.