Modeling logic error with advanced AGV

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kl asked Jul 05 2023 at 4:15 AM Jason Lightfoot commented Jul 08 2023 at 11:20 AM

Modeling logic error with advanced AGV

Hello, I am building a model with advanced AGV. In order to run the model, I have input the process flow to each AGV and create 2 global list for task sequence. I use next work point branches for this model. I am wondering why the model cannot run, hope to get some suggestions, thank you!!!

my model: layout.fsm

Software Version:

FlexSim 21.2.4

global list advanced agv modelling logic error

layout.fsm (153.2 KiB)

· 3

Jason Lightfoot ♦♦ commented · Jul 08 2023 at 10:10 AM

Hi @kl,

It looks like this question may be part of a homework assignment or academic project. The professors who assign simulation modeling exercises using FlexSim expect that the academic integrity of their assignments will be maintained. In addition, we are supportive of Honor Codes or Pledges that regulate the behavior surrounding academic assignments.

I recommend reading our best practices page on the subject, which includes some resources that you should find helpful as you use FlexSim for academic purposes. I also highly recommend Dr. Allen Greenwood's FlexSim Primer, which was written specifically for students and professors.

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kl Jason Lightfoot ♦♦ commented · Jul 08 2023 at 11:17 AM

Hi Jason,

This is not homework assignment or academic project! It is just a case in real world that we want to figure out. I sincerely apologize if there was any misunderstanding, as we simply want to resolve our model issue.

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Jason Lightfoot ♦♦ kl commented · Jul 08 2023 at 11:20 AM

As students who appear to be collaborating on the same model I'd be curious then to know the context.

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Answer 1 · 2023-07-05T06:54:49Z

Felix Möhlmann answered Jul 05 2023 at 6:54 AM kl published Jul 06 2023 at 10:27 AM

You have to push the items to the AGVWork list in the transport reference field.

Your AGVs also start at a control with no NextWorkPoint connection, so they won't start to travel around the network since there is no reference of where to move next.

You can find additional information and a tutorial about the AGV Process Flow template on the manual pages linked below.

https://docs.flexsim.com/en/21.2/WorkingWithTasks/AGVNetworks/UsingAGVProcessFlowTemplate/UsingAGVProcessFlowTemplate.html

https://docs.flexsim.com/en/21.2/Tutorials/TaskLogic/Tutorial4AGVs/AGVOverview/AGVOverview.html

Finally, I want to mention that the scaling in your model looks weird. Are the processors and distances between them supposed to be in the order of tens of kilometers?

capture1.png (7.8 KiB)

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chia725 commented · Jul 06 2023 at 1:38 AM

Hello, I've tried to solve the model's issue. The model can run after your suggestion. But I came up with another issue that it will stuck on a point and didn't move and I also notice that there are some problem with the item pickup. I was wondering if there's any logic error of the nextworkpoint branches? Hope to get some suggestions, thank you so much for your help!!!

model:layout-1.fsm

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layout-1.fsm (227.5 KiB)

kl commented · Jul 06 2023 at 3:56 AM

Hi! I've tried the file @chia725 provided(layout- advanced.fsm), and also have some questions. I think all the path are well connected, but after I run the model it will keep showing :

and also I think the source isn't delivering things properly~

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1688615764187.png (8.3 KiB)

layout-advanced.fsm (154.4 KiB)

Felix Möhlmann kl commented · Jul 06 2023 at 6:36 AM

Some of the control points seem to be corrupted somehow. Whenever you get such a message it seems that the control point the respective AGV is currently at is causing the problem.

Sometimes moving the control point around a little bit so the network gets updated can help. Maybe some of the control points have to replaced with new ones.

After moving some points a bit, the model @chia725 uploaded works fine until a deadlock occurs due to two AGVs moving toward each other.

The source is producing items normally, as you can see when you look at the output statistic.

layout-1_1.fsm

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capture1.png (6.2 KiB)

layout-1-1.fsm (155.1 KiB)

chia725 Felix Möhlmann commented · Jul 06 2023 at 6:45 AM

Thank you so much for your help! After I checked the model, I found that even though the source is producing the item normally. There is no input in sink which means that the agv didn't carry items to processor and sink. Does it mean that the carrying process in the advanced agv need to be modify?

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kl commented · Jul 06 2023 at 10:27 AM

Hi! I've tried the file chia725 provided(layout- advanced.fsm), and also have some questions. I think all the path are well connected, but after I run the model it will keep showing :

and also I think the source isn't delivering things properly~

0 ·

layout-advanced.fsm (154.4 KiB)

1688613793589.png (10.1 KiB)

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