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Chitra J avatar image
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Chitra J asked Jeanette F commented

How to use MTTR MTBF when using unplanned downtime

I want to add MTBF MTTR for processor/machine.

I know Time to Repair that machine once it is down. but I do not know when it will get down as it is a unplanned down time.

I need your help to put data in MTBF MTTR window.

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I could set First Failure Time and Down time parameters but not able to decide how to add Up time between two failures as it is unplanned down behavior.

From historic data of machine, we have data for how much time that machine was down in each Month (30 days)

eg. Machine A was down for total 565 hours in 30 days and each time it fails, it takes 54 min to get repaired.

Any help in this would really appreciable.

Thanks.

FlexSim 21.1.0
mtbrmttf
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Joerg Vogel avatar image Joerg Vogel commented ·
You have already the mean time between two failures 
available process time - total downtime / (total downtime / meantime of one failure)
Now you must decide which statistical distribution you set up with this mean time.

Maybe a exponential or normal distribution.

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Jeanette F avatar image Jeanette F ♦♦ commented ·

Hi @Chitra J,

We haven't heard back from you. Were you able to solve your problem? If so, please add and accept an answer to let others know the solution. Or please respond to the previous comment so that we can continue to help you.

If we don't hear back in the next 3 business days, we'll assume you were able to solve your problem and we'll close this case in our tracker. You can always comment back at any time to reopen your question, or you can contact your local FlexSim distributor for phone or email help.

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