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MTTR - Distribution




I would like to know if there´s some way to represent the duration of failures according the incidence once the frequency is known.



75% of failures last between 0.1 to 1 min

15% between 1 to 2 min

5% between 2 and 3 min

3% between 3 and 4 min

1.5% between 4 and 5 min

0.5% higher than 5 min


Is there some way to set it in the plant simulation?




Re: MTTR - Distribution

Gears Esteemed Contributor Gears Esteemed Contributor
Gears Esteemed Contributor
have a look in the distribution
Steffen Bangsow
freelance simulation specialist  

Re: MTTR - Distribution


Hello Steffen,


Thats exactly what I need. Thanks again for the advice.

Just one comment, When I input the path that contains the table necessary to Interval and Duration and run the simulation it works as expected but when I click in the check box to enable the availability the path that I input in the interval and duration fields changes from dEmp to Negexp and Erlang. And if I disable the availability the previous distribution that was set (dEmp) does not come automatically. It´s necessary to set it again.


As we use to run different scenarios, it´s important the software to have that characteristic, to bring the previous set it the availability is disabled.

Re: MTTR - Distribution

Siemens Phenom Siemens Phenom
Siemens Phenom

Hello Ricardo,


in such a case you can define separate failure profiles and switch between them according to your desired scenario. If you activate the "Availability" checkbox, Plant Simulation will automatically fit a negative exponential and Erlang distribution so that the values for the interval and duration of failures match the "MTTR" and "Availabilty" that you have defined. These distributions are chosen, as they have proven in many cases to be a good approximation to real world examples. So given that you already know the "Availability" and "MTTR" of your machine in advance and don't have any data for the interval and duration of failures you can use this feature.

Kind regards,

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