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Kitty C avatar image
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Kitty C Suspended asked Joerg Vogel edited

Storage strategy about different box size

In 3D tolls rack setting, I only can set fixed boxes in a rack cell

But in warehouse running ,to increase the area utilization, 1 rack cell will put into various of boxes according to box size

In the follwing model 4 size boxes will put into rack

I'd like to make the storage logic that 1 rack cell can put into 2 red or orange boxes, yellow and green box can only put 1

So how can I set the storage logic in the rack?

Storage Strategy about different box size.fsm

FlexSim 19.0.9
flexsim 19.0.9rack storage
storage-strategy-about-different-box-size.fsm (31.2 KiB)
storage-strategy.png (307.7 KiB)
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Joerg Vogel avatar image Joerg Vogel commented ·

A rack in 19.0 isn’t able to perform the features of a warehouse rack of 19.2. This has been discussed in various questions since very early versions like 2.6. The reason is, you can’t switch off the internal stacking algorithm.

The solutions are in order of complexity:

  • you live with that, what you get.
  • you update to version 19.2 or above
  • you put a pallet in a rack cell and stores on that your items
  • you place a queue in each rack cell to hold the items
  • you abandon a rack, and use instead a single queue and write a place location source code. A rack object is then only a draw surrogate, because you haven’t to rebuild this as well.
  • you develop your own rack with SDK.
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1 Answer

Joerg Vogel avatar image
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Joerg Vogel answered Joerg Vogel edited

There is a parameter in various Place in Bay and Place in Level picklist options, where you declare how many items are allowed in a cell for the rack. You can set this parameter to allow more items there. The main problem is then, the internal put strategy doesn’t look for an available cell, it searches only for an available bay and take not into account sizes of items. It just balances over all levels with all allowed items in cells. Then if there is an cell, which can store an item, this bay is selected. Then the algorithm looks for an available level.

The only way around is, you program a logic which manages cells before an item enters a rack or in the function Place in Bay. The logic sets on item labels for bay and level. You evaluate these labels in rack functions Place in Bay and Place in Level.

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