[step-manufacturing] 回复: EXTERNAL: Re: [EXTERNAL] Reminder: UUIDsfor the digital thread

Wed Apr 24 21:50:38 EDT 2024

Hello Martin and all experts,

Thanks for your inputs, this is indeed a great discussion.

In my opinion, there are n digital threads in a department/company/enterprise for  various-level digital business processes. A digital thread can be formed  for its specific business objective (e.g. design, machining, assembly,inspect a part or component, etc). The key is to keep these digital threads under management and control , and it could and should be realized based on system engineering theory and methods.  Specifally, Discrete Event System modeling and running can be used for achieve such goal. 

For example, for a typical machining CPS of CAD/CAM/CNC system , a set of various path of digital activity-digital thread (or something like that) can be managed and controlled through DES model and sevice-oriented execution. If you are interested in the idea, please read our recent paper (as attached) published on the International Production Research ( see Figure 8 and 11, in particularily). For other high-level business process, like product design and developemt, such discrete system model can also be created and executed.

Welcome any comments and arguments for my work and thoughts on this important and interesting topic. Probably it is closely related to the topic of digital thread. 

  Best Regards,

郑联语 博士，教授，系主任
北京航空航天大学  机械工程及自动化学院 工业与制造系统工程系
数字化设计与制造北京市重点实验室
航空高端装备智能制造技术工信部重点实验室

Prof. Dr. Lianyu Zheng
Head of the Department of Industrial and Manufacturing Systems Engineering, School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
MIIT Key Laboratory of Intelligent Manufacturing Technology for Aeronautics Advanced Equipments, Ministry of Industry and Information Technology (MIIT), Beijing 100191, China
Beijing Key Laboratory of Digital Design and Manufacturing Technology, Beijing 100191, China

发件人: Ray
发送时间: 2024年4月24日 23:54
收件人: Bryan Fischer
抄送: step-manufacturing at steptools.com
主题: Re: [step-manufacturing] EXTERNAL: Re: [EXTERNAL] Reminder: UUIDsfor the digital thread

Folks I think we may be misinterpreting the term digital thread as used in industry. 

Digital thread
wikipedia.org

Ray Admire

On Apr 24, 2024, at 9:38 AM, Bryan Fischer <brfischer at tdp360.com> wrote:

Hi

I suggest that we should use a different term than digital thread. We aren’t sewing, and we certainly don’t want our business processes hanging by a thread, or to depend on a thread. I’ve heard people argue whether it should be digital thread vs digital web vs digital tapestry, and in the end these are just metaphors. We are describing the path that information flows along, the path between connected or linked processes, devices, activities, applications, etc.

This weekend I will submit the manuscript for my new MBE book to the publisher. I didn’t include digital thread anywhere in it. Mainly because the term means different things to different people and I don’t think it’s the right term. 

Regardless of terminology, I continue to be very impressed with the work you are all doing on this project and I see it as the best work being done in the model-based space. 

Best Regards,

Bryan Fischer

TDP360 LLC
Office/mobile  (503) 260-3084

From: step-manufacturing <step-manufacturing-bounces at steptools.com> On Behalf Of jan.de.nijs at lmco.com
Sent: Wednesday, April 24, 2024 6:53 AM
To: Rencher (US), Robert J <robert.j.rencher at boeing.com>; Martin Hardwick <hardwick at steptools.com>; step-manufacturing at steptools.com
Subject: Re: [step-manufacturing] EXTERNAL: Re: [EXTERNAL] Reminder: UUIDs for the digital thread

Great discussion. Thanks for the input.

My thinking remains that there is exactly 1 digital thread per use case. Define the use case for me, and I will tell you what the digital thread has to be. I am stuck on this idea that the thread defines which data elements are needed to implement a specific use case.

So yes, if you agree that there are “n” use cases, then it is likely that there are “n” digital threads (although I think that there are many use cases that share the same digital thread).

I have a slide deck where I actually prove that point. “Simple” maintenance insights can be derived straight from an MTConnect stream. No need at all for UUID’s, part numbers, serial numbers, quality data. But just an MTConnect stream is never going to get you OEE. You need many more data elements for that. And for things like dynamic scheduling and (my favorite) causal analytics, you need many more again. There is an effort at UKentucky to look at DT’s of the cutting process to specifically quantify subsurface damage, which requires a completely different set of data elements. Again, IMO, proving the point that digital threads are use case dependent.

Jan.

From: step-manufacturing <step-manufacturing-bounces at steptools.com> On Behalf Of Rencher (US), Robert J
Sent: Wednesday, April 24, 2024 8:31 AM
To: Martin Hardwick <hardwick at steptools.com>; step-manufacturing at steptools.com
Subject: EXTERNAL: Re: [step-manufacturing] [EXTERNAL] Reminder: UUIDs for the digital thread

Hello Martin,

There is a continuing discussion regarding the number of digital threads.  One perspective is there is only one digital thread.  This one digital thread is the system that facilitates interoperability between disparate systems across the product lifecycle.  The other perspective is that there are “n” number of digital threads representing the respective workstreams or value streams utilized throughout the product lifecycle.

Both of these perspectives have advocates in the industry and both have valid arguments.   From my perspective the one digital thread approach lacks the depth and detail needed to align with the utility of the one digital thread.  

I have a conflict today with PLM AG.  I’ll try and jump on to this during a break.

Robert

Dr. Robert J. Rencher, D.M.
Sr. Systems Engineer, 
Associate Technical Fellow 
Enterprise Engineering 
The Boeing Company
PH: (206)295-0887
email:  robert.j.rencher at boeing.com 
"Vision without effort is day dreaming, effort without vision is drudgery" 

From: Martin Hardwick <hardwick at steptools.com> 
Sent: Wednesday, April 24, 2024 5:09 AM
To: Rencher (US), Robert J <robert.j.rencher at boeing.com>; step-manufacturing at steptools.com
Subject: Re: [EXTERNAL] [step-manufacturing] Reminder: UUIDs for the digital thread

EXT email: be mindful of links/attachments.

Hi Robert,
I agree there should only be one thread, but because of the digital twin composition, there is a transition between manufacturing and engineering that must be managed.
Martin
On 4/23/2024 2:29 PM, Rencher (US), Robert J wrote:
Hello Martin,

Thank you for sharing the diagram.  I would suggest an alternate labeling for the engineering and manufacturing digital thread.  The generalization of digital thread introduces the categorization of thread types, i.e. “engineering thread”.  If the attempt is to be discrete in assigning a label to a digital thread then a descriptive label that easily identify the purpose/use of the digital thread should be used.  Digital Threads align data/information with sequence(d) events/tasks/objectives.  A UUID could be assigned to a digital thread to identify the discrete digital thread use event.

Robert

Dr. Robert J. Rencher, D.M.
Sr. Systems Engineer, 
Associate Technical Fellow 
Enterprise Engineering 
The Boeing Company
PH: (206)295-0887
email:  robert.j.rencher at boeing.com 
"Vision without effort is day dreaming, effort without vision is drudgery" 

From: step-manufacturing <step-manufacturing-bounces at steptools.com> On Behalf Of Martin Hardwick
Sent: Tuesday, April 23, 2024 11:08 AM
To: step-manufacturing at steptools.com
Subject: [EXTERNAL] [step-manufacturing] Reminder: UUIDs for the digital thread

EXT email: be mindful of links/attachments.

All,
We will review organizing principles for the digital thread.
Martin
<image001.png>
Topic: UUID's for the Digital Thread
Time: Apr 24, 2024 09:30 AM Eastern Time (US and Canada)
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Martin Hardwick
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-- 
Martin Hardwick
President STEP Tools, Inc.
Cell: 518 253-0596
"The sticky tape wizards"
"There are billions of STEP files and millions of STEP-NC files"
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