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Q&A Using Flexsim and building models

  #1  
Old 08-15-2012
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Default How to use MTBF/MTTR in real case?

Hai, I'm confusing on using the MTBF/MTTR table, can someone please explain to me? What are the difference between exponential and normal? Which one is better in reducing the staytime?
  #2  
Old 08-21-2012
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Hi,
as far as I understand the MTBF/MTTR function is to give a platform to generate failures in runing processes.

I´m not sure if you allready read this:

http://www.flexsim.com/community/for...read.php?t=827

Further I think differences of distributions are explained very well in the Help/Commands and with Flexsim 6 in the pickoptions itself.
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  #3  
Old 08-21-2012
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Default

Hai, thank you so much. Another one question that I want to ask is, how to resend the items from processor queue to the source queue when the processor was down?

I have attached my model here.

Cheer,
Liang Wen Yin
Attached Files
File Type: fsm Send back the items.fsm (48.7 KB, 110 views)
  #4  
Old 08-21-2012
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What items do you want to send back to source Queue? All items that are in processor Queue or the one item in processor?
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  #5  
Old 08-21-2012
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Dear Sebastian,

I want to send all items that are in the processor queue.
  #6  
Old 08-21-2012
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Think here is a idea how you could solve this topic. If I understood the question right. Your Q2 doesn´t release item to P2 anyway. But maybe you can use what I´ve done as a hint.

If there is possibility that more than one item is in a processor Queue, you maybe have to use a "for" loop for getting all items done ;-)
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File Type: fsm Send_back_items_SH.fsm (48.6 KB, 99 views)
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  #7  
Old 08-21-2012
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Dear Sebastian,

I tried to wrote the "for" loop to get all items done but it seems like doesn't work well. Can you please come out that code for me? Thanks.
  #8  
Old 08-22-2012
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Ok, you are right "for" loop looks very difficult. It had to be a "while" loop.
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File Type: fsm Send_back_items_2_SH.fsm (48.6 KB, 97 views)
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  #9  
Old 08-22-2012
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Dear Sebastian Hemmann,

Thank you very much.

But when I run my real model until 683788 second, my model become lagging & the Flexsim is not responding. How come ya?
  #10  
Old 08-22-2012
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For me the model runs longer Simulationtime. But as I allready mentioned the model you shared doesn´t send items from queue Q2 to processor P2.

Maybe you could share your actual working model!?
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  #11  
Old 08-22-2012
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Dear Sebastian Hemmann,

Here is my model. But, in my model, the queue 2 will send the items to the processor 2.

Thanks.
Attached Files
File Type: fsm Model_1.fsm (128.4 KB, 100 views)


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