Patrick Zweekhorst avatar image
Patrick Zweekhorst asked Jason Lightfoot answered

MassFlow conveyor with infinite input


We are working on a big packing model were we find some problems with the massflow conveyor. We don't know if these questions are related, but just as a reference:
Opening Massflow conveyor by UpstreamOutputOrder - FlexSim Community

MassFlowConveyor with negative content - FlexSim Community

In the example for this question something goes wrong with the input of a conveyor. We have the following layout:


This works well until things start backing up. We want at maximum 300 cans per conveyor, so I have a wait for event waiting on the content changing to 300. When that happens we "close" the conveyor by setting the UpstreamOutputOrder to 0.That gives something like this:


All good so far. Then 2 strange things can happen:

When running the model directly to time 21.8 we have very strange stats values for one of the conveyors:

When running the model till time 17.4 and then stepping through the events till time 21.8 the results already look different:

These values are correct, but when you continue to run the model some more strange things happen at time 21.9:

Any ideas on this would be appreciated. Are we doing something we are not supposed to do? Or are there some rounding errors? Is there a work around?




FlexSim 24.1.0
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1 Answer

Jason Lightfoot avatar image
Jason Lightfoot answered

Patrick we've noted some anomolies with the events and densities during these events and so created an case in the issue tracking system. Thanks for pointing this out to us.

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