Asset Maintenance Model

[pnewman]

I am constructing a Maintenance Model to explore the relationship between Asset Utilisation and the demand for maintenance resources. I have considered that the latent defects in the asset population as a stock and from this I can determine the Time to Next Failure which is a significant metric in measuring the state of the asset. When this metric falls to a particular level I want to initiate an asset investment programe which when complete reduces the latent defect population. Which function (or functions) in the "Funtions" table allows me to do this and how. I have tried the PULSE function but it seems to apply at all subsequent periods when I needed to apply for only a single period thus resetting the Asset Defect Population until the next time that it deteriorates to the trigger level. Can anyone advise?

[Administrator]

Will a simple "if then else" work?

trigger = if then else ( stock = minimum stock, 1 , 0 )

Tony.

[pnewman]

Tony

Thanks I am using the IF THEN ELSE function as suggested. Unfortunately there is a delay in the Aquisition phase so until the Defect Population is reduced by the impact of the Investment it will continue to increase each period thereafter. It is this continuing rise during the periods of the investment delay that causes successive Renewal Investments when only the first one is required. The trigger should only work on the first instance.

Any suggestions to help would be appreciated

regards Paul

[Administrator]

Maybe use "SAMPLE IF TRUE" to flag that the first investment decision has been made, then the "IF THEN ELSE" also checks to see if the decison has been made.

Tony.

[Melvyn]

I am developing a simular maintenance model, only investigating risk in terms of safety of a system. I know that your e-mail was posted in 2004 but are you still working on it? did you solve the problem?

Melvyn

[LAUJJL]

Hi Melvyn

It would be a good idea to post your model, because I do not understand how you represent reality in your model.
It is difficult to give any advice in this case.
Regards.
JJ