MTBF and MTTR

[Trung Dũng Nguyễn]

Hi

How can we put Mean Tiem Between Failure and Mean Time To Repair meaning the failure frequency (fixed number) and the downtime as a function of distribution (eg:Log, Exp etc..) of a machine in a chain of fabrication? What I observed is that the Jaamsim only allows to put a boolean trigger without duration distribution and vice versa, I feel that combination of two functions is doable but complicated, note that in a chain of fabrication it may exist hundreds equipments.

Would it be possible to build another dedicated block allowing putting two paramenters mentioned above.

Happy new year.

Cheers
DungNT

[Harry King]

DungNT,

We have a "DowntimeEntity" object in our commercial software TLS (an add-on to JaamSim) that provides this function. It has been used to carry out some large Reliability Availability and Maintainability (RAM) studies, but it is still just a working prototype at this stage. Our plan was to move it to JaamSim once it is fully functional, but if there is interest we can release it much earlier -- say, mid-January.

We created a separate object for downtime so that a server type object can have multiple failure and maintenance modes, each modelled by a separate DowntimeEntity. In one of the RAM studies I mentioned, we modelled individual objects with as many as 200 failure modes. The entire model had a total of 19,000 failure modes.

What kind of model are you planning to build? It is always interesting and helpful to know how JaamSim is being used.

Harry

[Trung Dũng Nguyễn]

Dr.Harry

RAM is exactly what I am looking for, I am scpecially interrested in Offhore Oil Production System (continous system) and I am glad that you might launch Downtime module soon. For the Oil production system, you may see that the interrest is to understand the availability of overall system with different machinery configuration says: 2x100$%, 3x50% or 2x75% so the need for splitting is frequent, I have notied that Jaamsim can do this task but with branch node, can it be simplified?

You may know that for such system, the dependence of overall availability is quite high, eg: if utility system says Fuel Gas System is down, the overall process system is also down. To simplify it, I have noticed that Maros (DNV software) can modularize it into sub-system level so the model looks much more simple. This is something done with other software running on Simul8 platform.

Another interesting point is that several softwares can add the weather condition and lock a time frame if the bad weather condition occurs or night shift to reflect the case that if an offshore platform is isolated, no intervention is allowed during this time. I just wonder if Jaamsim can do it?

Regards
Dung