AGVs ignoring path orientation

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question

Felix Möhlmann asked Mar 5, '24 Jacob W2 commented Aug 26, '24

AGVs ignoring path orientation

Hi everyone,

one of our clients ran into issues with the AGV network and while investigating I encountered what seems to be a bug caused by the "Switch to Reverse/Forward" setting.

As you can see in the gif below, because the "Switch to Forward" value of the AGV is set to less than 90°, it prefers to travel in the forward which makes it ignore the facing constraint on the main path.

After it reaches the CP in the bottom left, any additional travel task given to the AGV results in an error stating that no path to the destination could be found, since the AGV at that point seems to 'realise' that it's facing the wrong way.

Interestingly, if the "Switch to Reverse" threshold is increased above 180° and the AGV thus returns to the junction facing forward, it actually adheres to the path orientation.

agv-ignores-path-orientation.fsm

Software Version:

FlexSim 24.0.1

agv agv path switch direction path orientation

1709640020903.png (3.6 KiB)

1709640343808.png (2.4 KiB)

path-orientation-bug1.gif (1.7 MiB)

path-orientation-bug2.gif (1.7 MiB)

agv-ignores-path-orientation.fsm (125.9 KiB)

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Answer 1 · 2024-03-05T15:35:09Z

anthony.johnson answered Mar 5, '24 Jacob W2 commented Aug 26, '24

This is a bug. I'll add this to the dev list.

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Jonah K ♦ commented · Apr 08 at 11:23 PM

@Felix Möhlmann This has been fixed in FlexSim 24.0.3 released today.

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Felix Möhlmann Jonah K ♦ commented · Aug 20 at 02:10 PM

I just ran into this issue again, so I reopened the question. While the AGV now behaves correctly when arriving at the intersection travelling backwards, it now ignores the path orientation setting when travelling forwards.

As noted in the original question you can see this if you set the "Switch to Reverse" threshold higher than 180°.

I tested this in 24.1 and 24.2 as well and got the same result.

Edit: Maybe I just misunderstood how the system is supposed to work. The AGVs does rotate to the correct orientation if the rotation threshold to switch to reverse "allows" to do so. That would mean that there is currently no way to force the AGV to always travel forwards except for paths where the orientation is forced?

@anthony.johnson

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Jacob W2 ♦ Felix Möhlmann commented · Aug 26 at 05:19 PM

Hi @Felix Möhlmann,

This issue has been fixed for the next release.

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