Webel Twin Pattern

04: Composite DigitalTwin

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Webel Twin Pattern: DigitalTwin: The multiplicity of 'digitalEntity:@Entity' and 'physicalEntity:PhysicalEntity' MUST be [1] when the DigitalTwin is in the state Attached, the @Entity is in the state Bound, and the PhysicalEntity is in the state Exists.

35: Activity ActualisePhysicalAsset and «STUB» ManifestActualAssetFromPotentialAsset

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SysML Activity Diagram

34: Activity «STUB» PopulatePotentialWithProcessesAndTrackingData

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33: Activity «STUB» PopulateDigitalWithDesignModels

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32: Activity CreatePhysicalEntityFromDigitalEntity

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Webel Twin Pattern: The information and data in AssetSpecification leveraged for creation of a new ActualPhysicalAsset need not necessarily only be «digital».

31: Case: Create a new physical asset using a «digital» @Entity initially as a digital "template"

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30: Activity UpdateDigitalFromPhysical

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25: Effect Activities used by the acquisition case

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29: Acquisition case: «STUB» Activities for initial model data and information mapping

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28: Activity «stub» PopulateDigitalEntity

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27: Activity CreateDigitalEntityFromPhysicalEntity

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Screencast: The Webel Digital Twin Pattern for SysML: Part 1: Simulating acquisition or creation of physical assets using Activities and StateMachines in Cameo Simulation Toolkit.

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© Copyright 2020 Darren R C Kelly (Webel IT Australia).

Read more about Screencast: The Webel Digital Twin Pattern for SysML: Part 1: Simulating acquisition or creation of physical assets using Activities and StateMachines in Cameo Simulation Toolkit.

26: Activity IdentifyAcquireAttachPhysical

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23: Mini StateMachine for DigitalTwin and DoAttach effect Activity

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SysML StateMachine Diagram

24: Case: Acquisition: Twin a pre-existing physical asset

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Webel Twin Pattern: An ActualPhysicalAsset is an asset that is also a «physical» PhysicalEntity.

Webel Twin Pattern: A DigitalTwin and PhysicalEntity must both be 'attached' to Sensors and/or Actuators under management of the DigitalTwin before the twinning control loop is fully entered.

Webel Twin Pattern: An AssetSpecification may contain ANY information or data of ANY kind in ANY format about how to acquire, manifest, build, or create a physical asset. This information may be distributed across an @Entity and a PotentialPhysicalAsset.

Webel Twin Pattern: Not every twinnable PhysicalEntity is worth treating as an asset.

21: Example instances for 'asset'

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22: Mini StateMachines for @Entity, PotentialPhysicalAsset, ActualPhysicalAsset

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Webel Twin Pattern: Once a PotentialPhysicalAsset has been integrated with a real, existing (has mass) ActualPhysicalAsset under twinning control, its job is done forever (although it may be kept as an historical tracking record).

Webel Twin Pattern: The sensor/actuator twinning control loop can involve automated devices (SensorDevice and/or ActuatorDevice) and or humans (SensorHuman and/or ActuatorHuman).

20: Package Diagram overview of 'asset'

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Webel Twin Pattern: A DigitalTwin (even a "process twin" or "finance twin"), always, without exception, BY DEFINITION HERE either directly or indirectly involves at least one existing or anticipated PhysicalEntity (even if only via another DigitalTwin)!

19: ANZLIC 2019 «snippet» text extracts about acquisition and creation of physical assets

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18: IBD for working environment temperature vs building energy consumption control loop

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17: Staging BDD for working environment temperature vs building energy consumption control loop

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16: Overview of 'building' package

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15: Example: Office building with blinds and lights affecting temperature and energy consumption

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01: Digital twin «snippet» text extracts from ANZLIC 2019

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Webel Twin Pattern: Convention: [MIGHT CHANGE]: A '*' prefix in a Property name of a «digital» @Block in a DigitalTwin model indicates a mapped block property, which must be typed by a non-digital «mappable» Block, and must have the «@» keyword applied.

14: IBD for PipeDigitalTwin flow control

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Webel Twin Pattern: A DigitalEntity (a.k.a. «digital» @Entity) used as a digital variant must not be directly bound to a «physical» PhysicalEntity (may not directly actuate/sense/affect)

13: PipeDigitalTwin instances

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UML Object diagram

12: Overview of 'pipe' package

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11: Example: Twinning a construction Pipe

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Webel Twin Pattern: A LogicalProcess may only act on a PhysicalEntity via a PhysicalProcess

10: Process overview

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09: IBD of DigitalTwin

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Webel Twin Pattern: Communication between the ControlSystem of a DigitalTwin and its digitalEntity:@Entity is via a dedicated protocol (ReadTwin, WriteTwin) distinct from the sensor reading or actuator driving signals.

08: IBD of basic twin control loop

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SysML Internal Block Diagram (IBD)

07: BDD of twin control loop Blocks

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06: Focus BDD for EntityRepresentation

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Webel Twin Pattern: A DigitalTwin may use one or more variantEntity:@Entity[0..*] to explore the impact of changes (optimisation studies, trade off studies) and then use them to drive the PhysicalEntity into a desired state (via its ControlSystem).

Webel Twin Pattern: The primary aim of the digitalEntity:@Entity of a DigitalTwin is to replicate its physical:PhysicalEntity as closely as possible (not to explore variants).

05: Twin instances

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Webel Twin Pattern: A «digital» DigitalEntity (a.k.a. @Entity) is NOT a representation! It is a digital encapsulation (it can only be perceived at the level of "bits and bytes"). It HAS many representations (such as views)!

WARNING: In natural language casual conversation one often hears people speaking of a digital twin "replicating" or "twinning" a physical entity. If you do it that way literally, you will NOT have anything to manage the control system loop!

Webel Twin Pattern: A PotentialPhysicalAsset is «digital», not «physical». It is used to acquire (an existing) or create (build, manifest, make) an «physical» ActualPhysicalAsset, which is a special case of «physical» PhysicalEntity.

Webel Twin Pattern: A DigitalTwin manages a control loop including a PhysicalEntity and a DigitalEntity (a.k.a. @Entity) that «replicates» it. It typically includes at least one Sensor and at least one Actuator.

Webel Twin Pattern: It is a DigitalEntity (a.k.a. @Entity) - not the DigitalTwin that owns it - that directly «replicates» geometrical, spatial, and material aspects (only) of a single PhysicalEntity.

03: Focus BDD for the DigitalTwin block

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Webel Twin Pattern: A DigitalTwin must model processes and the entities they act on separately.

Webel Twin Pattern: A «digital» DigitalEntity (a.k.a. @Entity) encapsulates strictly geometrical, spatial, and material aspects of a «physical» PhysicalEntity only. BY DEFINITION of this pattern it DOES NOT encapsulate processes!

Webel: Convention: [MIGHT CHANGE]: An '@' prefix in a DigitalTwin model indicates a «digital» Block that maps a non-digital «mappable» Block.

02: Overview of Package 'twin' and notations

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TRAIL: A SysML Pattern for Digital Twinning

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00: ‘This is Not a Pipe’ (‘Ceci n'est pas une pipe’)

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