[step-manufacturing] Notes from yesterdays meeting

[Martin Hardwick]

All,

Thanks for an interesting meeting.

The definitions of Digital Twin Prototype, Digital Twin Instance and 
Digital Twin Aggregate are going to be very useful for the work of WG15.

-- 
Martin Hardwick
President STEP Tools, Inc.
Cell: 518 253-0596
"There are billions of STEP files and millions of STEP-NC files"
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Action Items - Period 2
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Make new versions of the digital twin prototypes with tolerances defined.
Make STEP-NC programs to drill the holes.
Create a STEP-NC program to make the assembly.
Discuss relationship between the Digital Twin Supervisor and the Digital Twin Entity

Useful definitions
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10:04:38 From  Paul Cirino  to  Everyone:
	Digital Twin Prototype (DTP)—this type of Digital Twin describes the prototypical 
physical artifact. It contains the informational sets necessary to describe and produce 
a physical version that duplicates or twins the virtual version. These informational sets 
include, but are not limited to, Requirements, Fully annotated 3D model, Bill of Materials 
(with material specifications), Bill of Processes, Bill of Services, and Bill of Disposal.

10:08:33 From  Gordon Shao  to  Everyone:
	Digital Twin Instance (DTI) - this type of Digital Twin describes a specific 
corresponding physical product that an individual Digital Twin remains linked to throughout 
the life of that physical product. Depending on the use cases required for it, this type of 
Digital Twin may contain, but again is not limited to, the following information sets: A 
fully annotated 3D model with General Dimensioning and Tolerances (GD&T) that describes the 
geometry of the physical instance and its components, a Bill of Materials that lists current 
components and all past components, a Bill of Process that lists the operations that were 
performed in creating this physical instance, along with the results of any measurements 
and tests on the instance, a Service Record that describes past services performed and 
components replaced, and Operational States captured from actual sensor data, current, past 
actual, and future predicted.

10:10:45 From  Gordon Shao  to  Everyone:
	Digital Twin Aggregate (DTA) – this type of Digital Twin is the aggregation of all 
the DTIs. Unlike the DTI, the DTA may not be an independent data structure. It may be a 
computing construct that has access to all DTIs and queries them either ad-hoc or 
proactively. On an ad hoc basis, the computing construct might ask, “What is the Mean Time 
Between Failure (MTBF) of component X.” Proactively, the DTA might continually examine 
sensor readings and correlate those sensor readings with failures to enable prognostics.


Action Items - Period 1
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Send data files to the team
Check validity of the data files in NIST STEP File Analyzer
Put T marking onto the plate to fix orientation
Add hole features onto the data
Add GD&T to the parts in the original AS1_ug file

Future Action Items
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Add serial numbers to the MBOM data
Add GD&T to the mbom assembly file

Questions
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Design hole features or manufacturing hole features or both?
Usage of Make_from relationships?
Is the digital twin file conformant when it contains multiple instances of a product, etc?
How to trace requirements from product source to mbom instance?
What we are doing in the context of the bigger picture
How to document our assumptions and results