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bnh-flexsim-for-masterthesis asked Jeanette F commented

Distribution of items to different locations in an AGV-network

Hey all,

In the model attached is a distribution situation. I have designed one pick-up area with 7 possible pick-up-points. From there the 8 assigned AGVs should deliver the items to the drop-off-points in the main area (highlighted by red CPs).

Each of those CPs should only be able to hold 1 item in the simulation run, so if an item is delivered to one CP, the CP will be unavailable for further item deliveries but the CP on the path can still be passed by AGVs, so there is no physical barrier. Currently only the nearest CP will be supplied.

Also, the main loop consists of pick-up and drop-off and finally after all tasks are done: parking. Currently, because of the limited CPs attached to the main loop, there are deadlocks accuring. Is there a way to ensure a continous flow in the system and prevent deadlocks? One way could be including more CPs as there are AGVs in the system, but that seems like a quite inelegant solution.

Thank you very much!

Layout-Test.fsm




FlexSim 23.0.2
distributionscontrolpointdropoff
layout-test.fsm (185.7 KiB)
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Jeanette F avatar image Jeanette F ♦♦ commented ·

Hi @bnh-flexsim-for-masterthesis, was Jason Lightfoot's answers helpful? If so, please click the "Accept" button at the bottom of the one that best answers your question. Or if you still have questions, add a comment and we'll continue the conversation.

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Jason Lightfoot answered bnh-flexsim-for-masterthesis commented

I think you need to change the Max Allocations of MainPickUPPoint to more than one and optionally make that path accumulating (and others since without it the TEs will overlap)

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bnh-flexsim-for-masterthesis avatar image bnh-flexsim-for-masterthesis commented ·

Hey Jason,

when i am running the model, at some point there is an deadlock between AGV_4 and AGV_6, because after AGV_6 drops off the item, it drives back on the bidirectional path and blocks the CP for AGV_4.
There should be a few other possible CPs to which AGV_6 could travel to, but won't.
problem-deadlock.png

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problem-deadlock.png (60.9 KiB)
Jason Lightfoot avatar image Jason Lightfoot ♦♦ bnh-flexsim-for-masterthesis commented ·
I can't make that happen in your original - can you post the (updated?) model ?
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bnh-flexsim-for-masterthesis avatar image bnh-flexsim-for-masterthesis Jason Lightfoot ♦♦ commented ·

Sure. Here is the model:Layout_Test_02.fsm

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layout-test-02.fsm (195.4 KiB)
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