Thanks Dave for your example, however, we want to trigger the maintenance based on the failure probability of the machine not based on the pressure value. the failure probability if a function of (x,Y).
let say that:
Pressure = X(t)= kt, t= processing time, k=constant
Temp= Y(t)= sin(t)+6t
Failure Pr.= P(X,Y)
Po= 0.75. >> threshold
if Pr(X,Y)=> 0.75 stop the machine.
my first thought was to model those two measures as resources put then I couldn't figure out a way to link that with the reliability logic