NUMERICAL PROBS ON AVAILANILITY

[brightinstinct]

HI
I STUCKED IN SOLVING PROBLEMS ON AVAILABILITY .I NEED TO GO THROUGH SOME SOLVED PROBLEMS ON AVAILABILITY.CAN U HELP ME ON THIS BY ANY SENSE.

 

[IRstuff]

Availability in the military parlance comes in various flavors. The intrinsic availability Asub0 is the MTBF/(MTBF+MTTR), which is the up time divided by the sum of the up time and the repair time. This number assumes that the repair parts are immediately available.

A more realistic, but extremely more difficult availability includes the MLDT, mean logistical delay time, in the denominator. MLDT takes into account the availability of repair parts and the possibility of needing to send for repair parts from the logisitics chain or depot. A typically used MLDT is 72 hrs, which is pretty absurd, but we use it. A correctly calculated MLDT should have individual MLDT's for each replaceable component weighted by its failure rate.

TTFN

 

[poetix99]

...which is to say nothing of good ol' thermodynamic availability, which is "equal to the maximum reversible work, minus the work done against the surroundings" [Van Wylen & Sonntag]

If this is what you're after (though I suspect that IRstuff addressed your question), I suggest one of those problem solving workbooks on thermodynamics.