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Raashid Mohammed avatar image
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Raashid Mohammed asked anthony.johnson answered

Operators walking through conveyor

In my model when the operators start to pick up the item on the conveyor they walk through the conveyor.

Is there a way we can avoid that?

I have tried using network nodes and Astar, but neither seem to work.

See attached,

model06-01-2016-currentstate-12pm.fsm

FlexSim 16.0.1
conveyorastarnetwork nodescollisionpathfinding
collision.png (245.6 KiB)
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Joerg Vogel avatar image Joerg Vogel commented ·

you can add pickoffsettasks to the tasksequence previous to the frloadtask. In the Parameters you set the ratio of the load location the traveler uses.

Another approach (not tested on my own) is to move the exit or entry objects of your conveyor system to the side edges. The size is variable, too.

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anthony.johnson avatar image
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anthony.johnson answered anthony.johnson edited

If you're using AStar, short of intricately defining the motion of each operator, my best suggestion is to change the acceleration and deceleration of the operators to 0. One big problem in this model is that the pickup prediction heuristic (the thing that's figuring out where along the conveyor to go to pick up the item, based on its position and speed) isn't working very well because acceleration/deceleration are significant portions of an operator's motion, which the prediction heuristic does not take into account. So the operators are predicting where to pick the item up, then going there, then realizing they're behind, so they then start chasing the item down the conveyor, and in doing that, they start walking over the center of the conveyor. By removing the acceleration/deceleration component, the operators make a much better prediction of where to pick the item up, so they don't start chasing it down the conveyor.

This solution won't make it perfect, especially when the operators still approach the conveyor at close to parallel. But it should make it better.

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jing.c avatar image
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jing.c answered

Try to use network nodes and set "Do not travel offsets for load/unload tasks" which is the reason the operator walk through the conveyor within "travel offsets".


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