Problem with AGVs allocation

Hi,

I am working on a model for my master thesis and I encountered some problems that I am not able to fixed. According to my understanding they are all associated with path and control point allocation.
Can someone try to help me while keeping the model as private? Is there a specific place where I should upload the model?

PS: I am also using Cplex on python for running a dynamic tasks dispatching algorithm, however the problems exists also while running the model without the Dynamic algorithm (so withouth the python connection).

Thanks in advance

Software Version:

FlexSim 23.1.2

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5 |100000

Attachments: Up to 12 attachments (including images) can be used with a maximum of 23.8 MiB each and 47.7 MiB total.

jacopo-r commented · Jun 02, 2023 at 01:18 PM

UPDATE:

I just made this post public and I will now share a new version of the model where the "Assign task" code has been changed a bit. However, the model still creates problems with deadlock and wrong allocation with some replication when running the model manually for many times with random streams.

04_All_Cases_Model_1_16.fsm

python-cplex-model.py

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04-all-cases-model-1-16.fsm (3.7 MiB)

python-cplex-model.py (2.2 KiB)

Kavika F ♦ jacopo-r commented · Jun 12, 2023 at 05:20 PM

Hey @jacopo_r, have you looked at the " Preventing Collisions and Deadlock" section of building AGV Network Logic? There are some helpful guides that may help you eliminate your deadlocks. For example, avoid using accumulating paths and instead have AGVs stop on actual Control Points. If you want to use accumulating paths, then we can figure out a work around using Control Areas and such to ensure deadlocks won't happen.

I'll continue looking into the issue.

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Kavika F ♦ Kavika F ♦ commented · Jun 12, 2023 at 06:19 PM

@jacopo_r, after turning all paths to "No Accumulation", there were no more deadlocks for the entire run; however, this probably affected the spacing and timing of events. You would need to add more control points to ensure the desired spacing at intersections, allocations, etc. Here's the modified model where I programmatically changed all paths to non-accumulating.

attempted_fix_1.fsm

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attempted-fix-1.fsm (3.7 MiB)

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