How to make AGVs accumulate?

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Peter W8 asked Aug 24, '22 Peter W8 commented Sep 8, '22

How to make AGVs accumulate?

How do I control the accumulation of AGVs? I've tried using Accumulation Types for different paths but nothing seems to work. What I'm trying to achieve is that if the recieving station is occupied the AGV should leave the current station and travel to the occupied station. Since the recieving station is occupied the AGV should now wait until the occupied station is ready to recieve. I've attached to images were the accumulation should occur. I've also uploaded the model "Accumulation of AGVs" to flexsims file share site.

Software Version:

FlexSim 22.1.1

accumulation agv accumulation

accumulation1.jpg (154.0 KiB)

accumulation2.jpg (142.0 KiB)

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

Answer 1 · 2022-08-24T08:37:56Z

Ralf Gruber answered Aug 24, '22 Peter W8 commented Sep 8, '22

Peter,

since I do not have access to your model, I can only guess:

Did you change the Number of Max Allocations and/or the Deallocation Types of the Control Points to fit your needs? You need to do that to initiate travel of either multiple AGVs to the same CP and accumulate in front of it on the path, or to release a CP when an AGV is leaving. The default settings are very restrictive.

Check on that, please.

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

Peter W8 commented · Aug 24, 2022 at 09:05 AM

Hi Ralf,

thank you for your suggestion. Yes, I've tried to change the number of max allocations at the controlpoints of the receiving stations. I've also tried to change the deallocation types. For some reason this doesn't work. As is wright now, the AGV waits at the current station until the next one becomes available. This causes unnecessary blockage.

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Ralf Gruber ♦ Peter W8 commented · Aug 24, 2022 at 10:08 AM

In both pictures in your original question it seems, that the AGVs you want to queue up are not loaded yet. Is there a chance that transports are not initiated, yet, because the sending processor does not have a destination to send to due to all receiving processors being occupied? In that case, no transport will be initiated. Sorry for the guessing work, but without the model in hand that is all I can do.

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Jason Lightfoot ♦♦ Ralf Gruber ♦ commented · Aug 24, 2022 at 10:25 AM

This is correct - so far the model is using FlexSim's standard logic for item handshaking and transport - the only difference is that it uses a label on the item to fix the transporter. You can remove the default behaviour and have a process flow create all the transport jobs to achieve what you're describing.

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