AGV Intersection passage control rule

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Emily K asked Oct 19, '22 Kavika F commented Nov 7, '22

AGV Intersection passage control rule

Dear all,

When multi AGV meet at the intersection, the order which AGV pass the intersection is based on the allocation of control points, which is FIFO. I wonder if I could replace this rule with the AGV which nearer its destination pass first? Below is my idea:

1. Trigger AGV On Load, use cpdistance to calculate its distance between pickup point and drop off point.

2. AGV speed is fixed, then I could calculate the “finish time” needed by using distance data above.

3. I would like to use Agent System to detect the distance between AGVs and use Behaviors>On Enter Proximity> Activate Agent Behavior to replace the allocation of control points. I think I need to assign a label “RemainingTime” (=finish time-current time) to AGVs so that I could compare the value of label in the Activate Agent Behavior’s condition and let the AGV with less value pass first.

I wish to use AGV template in Flexsim, but I have no idea where should I modify to add an “Assign label” activity.. Or maybe I should build my own process flow?

Your suggestion and help is much appreciated :)

Software Version:

FlexSim 21.2.4

agv process flow proximity agent system intersection control rule

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Kavika F ♦ commented · Nov 07, 2022 at 06:05 PM

Hi @Emily K, was Jeanette and Jason's answer helpful? If so, please click the "Accept" button at the bottom of their answer. Or if you still have questions, add a comment and we'll continue the conversation.

If we haven't heard back from you within 3 business days we'll auto-accept an answer, but you can always unaccept and comment back to reopen your question.

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Answer 1 · 2022-10-26T21:05:35Z

Jeanette F answered Oct 26, '22 Emily K commented Nov 2, '22

Hello @Emily K,

@Jason Lightfoot created a solution for this recently. You can find it in this post.

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Emily K commented · Oct 27, 2022 at 10:58 AM

Hi Jeanette, thanks for your suggestion.

Control area is quite static. As I consider that AGVs might meet each other on the bi-directional path in opposite direction, I would like to use Agent System to detect the proximity instead of using control area.

So that I would able to set the proximity radius according to different state(on the same path with same direction, on the same path with different direction, on the different path).

I add a "RemainingTime" label, value would be getvarnum(agent.object,"totaltraveldistance")-getvarnum(agent.object,"curmaxtraveldistance")

I think I am approximate to what I what to achieve, but how could I compare the value of "RemainingTime" of each agent in the condition field?

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1666868338964.png (61.9 KiB)

Jason Lightfoot ♦♦ Emily K commented · Nov 01, 2022 at 12:44 PM

Instead of interpreting those variable nodes why not just use the distancetotravel() function?

When the proximity fires you will have a pointer to the other agent which will allow you to find its remaining distance.

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Emily K Jason Lightfoot ♦♦ commented · Nov 02, 2022 at 06:13 AM

Thanks @Jason Lightfoot for the information!
But the distancetotravel is not in the tree of task executer, how could I get the value of the destination? The destination of AGV might vary due to the type of load.

Could I Interpret in this way: distancetotravel (agent.object, getvarstr(agent.object, "finalDestCP")?

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