A star traveler not de-allocating node

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Rahul R asked Aug 14, '23 Rahul R commented Aug 15, '23

A star traveler not de-allocating node

I am modeling AMR movement using A star network and have few questions-

1. I noticed some travelers are not de-allocating nodes after passing them. They finally release this node on reaching destination. Other travelers are left to be in blocked state because of this. I have tried changing de-allocation time offset in A star navigator properties to 0,0.1, 1 sec but the issue still exist. Any idea why this is happening?

At 375 sec, AMR363 does not de-allocate the node and subsequently, AMR403 gets blocked.Test_Model_AStar.fsm

Software Version:

FlexSim 23.1.3

agv a star navigation amr

ground-hub-sc.gif (12.0 MiB)

test-model-astar.fsm (110.2 KiB)

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Julie Weller commented · Aug 14, 2023 at 08:36 PM

Hi @Rahul R,

For your first question, it's hard to know how to help without looking at your model. To receive a more accurate solution, please post your model or a sample model that demonstrates your question.

If your model contains sensitive information, you could first toggle your post as private using the "make private" option under your question's "gear" menu. Private questions are visible only to site moderators. You can also contact your local FlexSim distributor for phone or email help.

For the second question, you could add a preferred path to help reduce congestion if you know where you want them to go?

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Rahul R Julie Weller commented · Aug 14, 2023 at 11:14 PM

@Julie Weller - I edited the original question and added a test model

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Answer 1 · 2023-08-15T13:31:54Z

Jason Lightfoot answered Aug 15, '23 Rahul R commented Aug 15, '23

I was able to avoid this issue by turning off the option to ignore inactive travellers. This meant that the AMRs have to be assigned by distance to the pickup queue which is best evaluated once when the AMRs are pushed to the list, otherwise the constant evaluation kills the run speed.

Model attached.

test-model-astar_jl.fsm

However I still think there are issues with the model so will create a report for the developers. Just know that if a fix is forthcoming, it will be in the latest supported versions, not 23.1.

test-model-astar-jl.fsm (110.1 KiB)

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Rahul R commented · Aug 15, 2023 at 04:37 PM

Thanks Jason for the solution and adding bug to the dev list. Curious to know what is causing this weird behavior? I look forward to solve in subsequent releases.

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