question

Joana Fpds avatar image
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Joana Fpds asked Felix Möhlmann answered

Output per hour sudden increase

Hi!

In the below process (image) the output between 12pm and 13 pm is suddently increasing and I don't know why, because the parameters don't change/ are the same. During the process, the "Multiprocessor" output is higher than "Embalamento e rotulagem" output, however between this interval (12pm-13pm) they become the same. Why this happen?

modelo.png

1641655411446.png

Thank you.

FlexSim 22.0.0
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1641655411446.png (80.1 KiB)
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Joerg Vogel avatar image Joerg Vogel commented ·

It‘s hard to say just from your word and pictures! You could get an answer, if you attach your model.

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Joana Fpds avatar image Joana Fpds Joerg Vogel commented ·

Thank you so much @Joerg Vogel , my model are below.


TrabFI_11_conveyorReto.fsm

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trabfi-11-conveyorreto.fsm (85.1 KiB)

1 Answer

Felix Möhlmann avatar image
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Felix Möhlmann answered

I believe this happens due to floating point number inaccuracies when converting the item from the multiprocessor into flow units on the mass flow conveyor and back. The first time an item leaves the multiprocessor no item is actually generated at the end of the mass flow conveyor. Then at a later point, two items are generated from one "batch". You can also see is the "double step" in the output vs time chart of the combiner at around 12:15.

Other than removing the mass flow conveyor (is there even a point to it other than visualiziation?), the only workaround I can offer is to change the "Units per Package" setting on the exit transfer to something like 199.99999. This will result in an extra item being generated after a very long run time though.

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