Apply MTBFs to processes in Multiprocessor

Question

question

Steven Chen asked May 23 2022 at 5:48 AM Jason Lightfoot commented May 23 2022 at 10:59 AM

Apply MTBFs to processes in Multiprocessor

Hello,

I want to set different MTBFs to different processes in Multiprocessor, but MTBF can only apply to object. For this scenario, each process has its own UpTime and DownTime, and calculated independently.

Software Version:

FlexSim 22.1.1

mtbf mttr multiprocessor

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Answer 1 · 2022-05-23T06:14:25Z

Felix Möhlmann answered May 23 2022 at 6:14 AM Jason Lightfoot commented May 23 2022 at 10:59 AM

Could it be an option to just use multiple normal processors connected to each other? To limit the amount of parts in the system, you can close the input of first when an item enters and open it again when the item exits the last processor in the chain.

processor_chain.fsm

1653286463370.png (56.0 KiB)

processor-chain.fsm (28.9 KiB)

· 4

Steven Chen commented · May 23 2022 at 6:54 AM

Thank you for the solution. I make an extended model for single state.

processor-chain-w-state_v22.1.fsm

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processor-chain-w-state-v221.fsm (46.1 KiB)

Joerg Vogel commented · May 23 2022 at 8:17 AM

A processor and so any inherited object like a multiprocessor are capable to process more items simultaneously. This means whenever an item enters a processor class object, up until its maximum capacity is reached, processing starts on each entered item immediately. All items are in different stages of their processes in a single machine. If a machine failure occurs, then the object and not the different separate items are involved by a MTBF/MTTR Tool event. Items only take part on such an event.

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Steven Chen Joerg Vogel commented · May 23 2022 at 10:49 AM

Does I understand correctly that you are referring separated MTBFs for separated items? I don't find such senario neither. But I think the reason for using multiple MTBFs could be some process has higher risk on causing breakdown, since the process time can vary, indicate different MTBFs is my current solution.

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Jason Lightfoot ♦♦ commented · May 23 2022 at 10:59 AM

You could listen to the state change for the multiprocessor state profile in a process flow and have that manage you unplanned stoppages based on the time in each process.

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