Behavior of a "send AGV relative to trailer"

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Pierre G asked Dec 4, '23 Jason Lightfoot commented Dec 6, '23

Behavior of a "send AGV relative to trailer"

Hi,

In the model attached (2023_12_04 - Send AGV relative to trailer.fsm), you will find this situation :

First, I send the trailer of the AGV to the blue CP :

It works as expected.

And, as you can see, the AGV has "passed" the red CP (but not the trailer).

Then, I send the trailer to the red CP.

I expected the AGV system to understand that it just needs to move forward 1m, but it doesn't (the AGV will make a loop). I only have this behavior when the AGV has "passed" the destination CP which will be used in the next AGV Travel task.

Is this a normal behavior or a bug ?

If it's normal, do you have a solution to avoid this none necessary travel in this situation ?

Thanks.

Software Version:

FlexSim 23.0.12

agv trailer

1701698214065.png (12.6 KiB)

1701698266103.png (10.0 KiB)

2023-12-04-send-agv-relative-to-trailer.fsm (36.0 KiB)

Answer 1 · 2023-12-04T15:01:39Z

Jason Lightfoot answered Dec 4, '23 Jason Lightfoot commented Dec 6, '23

It's a bug or design failure. I think I've already sent this in but I'll do so again. Thanks Pierre.

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Pierre G commented · Dec 06, 2023 at 10:46 AM

Hi Jason,

Thanks for your answer.

I'm currently building a model where this behavior is a problem, because the train makes unnecessary extra loops.

If you already encounter this problem, have you found a "clean" and "robust" way for the train to make these 2 stops, without making an extra loop?

Thanks for your help.

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Jason Lightfoot ♦ Pierre G commented · Dec 06, 2023 at 04:27 PM

You could try repositioning the control points (so that they are always in front of driver/AGV) and use a path offset value to adjust back to where you wanted the trailer to stop. This would assume you know the maximum train length and is more effort than just positioning a control point at the stop location - I've not tested it yet.

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