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Adil M avatar image
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Adil M asked Felix Möhlmann commented

Conveyor Speed

Hi I was using a model which was used for a accumulating mechlite (Power of upstream conveyor section is reduced if the downstream conveyor gets 95% full). However, I also wanted to test what would be the effect in case the conveyor was fully powered. I removed all the triggers from the conveyors but it seems that the upstream conveyor is still slowing down, and not maintaining a constant speed. Is there something in the process flow that continues to slow the conveyor down? Attaching both models for reference. @Felix Möhlmann


Full Power Conveyor.fsmMech Accumulation Without pick off.fsm

FlexSim 21.2.4
conveyor
full-power-conveyor.fsm (136.7 KiB)
mech-accumulation-without-pick-off.fsm (136.5 KiB)
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Felix Möhlmann avatar image
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Felix Möhlmann answered Felix Möhlmann commented

The last conveyor section still had the triggers set and some sections were set to have a reduced speed of 2 in/s.

You also seem to have reduced the maximum speed of the operators which needs to be reflected in the code for the pickup prediction. (I adjusted it so it reads the max. speed instead of using a fixed value)

full-power-conveyor_1.fsm


full-power-conveyor-1.fsm (136.8 KiB)
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Adil M avatar image Adil M commented ·

Thanks Felix- I also noticed that in some instances the operator moves far away from the conveyor belt to pick a package. Is it because the last section of the conveyor is smaller? Operator Movement.PNG

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operator-movement.png (233.3 KiB)
Felix Möhlmann avatar image Felix Möhlmann Adil M commented ·

No, this happens because the pickup point calculation has no way of knowing if the item has stopped (well, you could determine if it has stopped, but you wouldn't know if it might resume at some point). So it still uses the current speed of the conveyor to calculate the intersect point.

I actually added a workaround for this in the the attached model above. The x-location of the pickup point is restricted to not be larger than the number in the "Math.min" expression. So if you use that version and haven't moved the conveyors this shouldn't happen.

1670270267753.png

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1670270267753.png (4.1 KiB)

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