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MC Bunji avatar image
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MC Bunji asked Natalie White commented

How do I limit the number of flow items created by the source?

Hello, Flexsim gurus!

I am building this model to replicate the operations of a basic distribution center. In my model, the source will feed the system with ONLY 500 flow items classified into 2 different categories: red and blue

These items will flow through two conveyors to Queue1, from where they will be moved into their respective racks.

The dispatch of the items from the racks to Queue2, then to the processor (quality control station), and finally to the sink will begin ONLY when all 500 flow items have been created and stored in their respective racks. This is to replicate the arrival of products and storage before sales.

initial-conition.png

THE CHALLENGES

  1. How can the number of flow items created by the source be limited to 500?
  2. How can I ensure that 70% of the items have a red color and 30% have a blue color?
  3. How can I prioritize the put-away of red items from Queue1 to the racks over the blue items? (If both red and blue items are present in Queue1, the red item will be moved to its respective rack before the blue item)
  4. How can I ensure that dispatch begins ONLY 10 minutes after the last flow item has been stored in its respective rack?
  5. How can I prioritize the dispatch of red items over blue items when flow items are dispatched from the racks to Queue2, then to the processor, and finally to the sink? (Items will be dispatched individually in an alternating pattern: 10 red items, then 5 red items)

I will appreciate a clear and concise response with pictures (if possible) to any of the questions if not all, as I am a beginner on Flexsim.

@Joseph Gillespie , @Joshua S , @Eric M

Thank you!

FlexSim 23.1.2
sourcedispatch prioritizationstorage before dispatch
initial-conition.png (151.6 KiB)
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Joerg Vogel avatar image Joerg Vogel commented ·

Thank you for joining this community. What do you want by a ratio of item by 3 to 7 exactly: a ratio or statistical distribution? You have to be precise to get sufficiently answers. I assume this is one of your first models for an academic exercise. Then you should start it easily. One Source creates 150 products another 350 product. If you look into source object, you can identify different modes of creation. Try them out. You learn more, if you try something to do.If you need only one distribution point, then you collect your created products in a queue and let them transport from there.

Racks: There is a Tool to paint slots. Read about it, search this forum and build it yourself. If you run into a problem ask again here. And if you ask, then it should discuss only ONE problem!

Dispatching of items by time can you do by minimum dwell time option in rack properties.
Dispatch patterns can you control by queues pulling items in input property pane. Additionally you control when and which queue opens or closes its input or output. Once you get a successful solution for this you can transfer it to objects in your working model.

And I must inform you, that there is an article here at this site, which contains informations, how to use this site.
Regards Joerg.

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MC Bunji avatar image MC Bunji Joerg Vogel commented ·

Thank you for your response and guidance. I appreciate your suggestions, and with your hints on "where to find what," I have been able to solve most of the problems I was facing. However, I would like to address a specific challenge I'm currently experiencing, and I would greatly appreciate your assistance with it.

I understand that the source object offers different modes of creation. Could you please provide more details on how to set up a source to generate exactly 500 flow items? I have tried using the arrival schedule option, but the items are created so quickly that the conveyor is constantly congested.

I suspect that my entries in the table might not be properly computed. Could you please take a look at my setup and suggest a potential solution for this issue?

source-properties.pngarrival-schedule.png

Your help is highly valued.

Thank you!

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Natalie White avatar image Natalie White commented ·

Hi @MC Bunji, was Joerg Vogel's answer helpful? If so, please click the "Accept" button at the bottom of their answer. Or if you still have questions, add a comment and we'll continue the conversation.

If we haven't heard back from you within 3 business days we'll auto-accept an answer, but you can always comment back to reopen your question.

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1 Answer

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Joerg Vogel avatar image
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Joerg Vogel answered

Set a rate of less items with more arrivals. And if you need to control a more steady input into a conveyor you can use a processor.

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