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Topic Title: Modeling part state during manufacture
Topic Summary: Is there a model where parts with state flow through processes with state?
Created On: 09 April 2013 12:11 PM
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 09 April 2013 12:11 PM
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Posts: 7
Joined: 09 July 2006

Modeling manufacture of complex parts that have many states throughout the production process, I'd like to use those states in a model.

Its common to model processes, especially software processes, that have state, but in a factory its common to pick up a processed part look at it and make some decision i.e. assign a state 'good' or 'scrapped' etc. to that part.
Parts also have an observed state as, say, process X can be observed to have been carried out, but not process Y again adding an implicit state to the part.

I'd like to be able to switch from a viewpoint of at least process, to a viewpoint of state.

SysML allows Item-flow between processes but only allows (as far as I can tell) objects i.e. 'parts' to flow, not parts in a specific state which is what happens in reality.

IDEF3 allows a process view and a state transition diagram which comes close, but every example I've seen is for state of, say, an order, and I'm not sure I can show part state in the process diagram.

Any suggestions on how to achieve this appreciated, the aim is to have an understandable-by-all viewpoint from the parts perspective and drive design of, well everything in a manufacturing system, from that when discussion between, say, IT, Operations, Automation, Processes, suppliers become lets, say 'fraught'. At such a point I'd like to be able to find the parts state, look at the next state - or transition necessary to get there, and refocus the discussion.

 29 May 2013 02:38 PM
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Joined: 29 May 2013

I think a software called witness can be used for a lot of modelling options. You can see a video of how to use witness on youtube. i have used it during my course at university. i think it is quite detailed. It might answer your questions.

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